--- /dev/null
+// Knockout JavaScript library v2.2.0
+// (c) Steven Sanderson - http://knockoutjs.com/
+// License: MIT (http://www.opensource.org/licenses/mit-license.php)
+
+(function(){
+var DEBUG=true;
+(function(window,document,navigator,jQuery,undefined){
+!function(factory) {
+ // Support three module loading scenarios
+ if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
+ // [1] CommonJS/Node.js
+ var target = module['exports'] || exports; // module.exports is for Node.js
+ factory(target);
+ } else if (typeof define === 'function' && define['amd']) {
+ // [2] AMD anonymous module
+ define(['exports'], factory);
+ } else {
+ // [3] No module loader (plain <script> tag) - put directly in global namespace
+ factory(window['ko'] = {});
+ }
+}(function(koExports){
+// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
+// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
+var ko = typeof koExports !== 'undefined' ? koExports : {};
+// Google Closure Compiler helpers (used only to make the minified file smaller)
+ko.exportSymbol = function(koPath, object) {
+ var tokens = koPath.split(".");
+
+ // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
+ // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
+ var target = ko;
+
+ for (var i = 0; i < tokens.length - 1; i++)
+ target = target[tokens[i]];
+ target[tokens[tokens.length - 1]] = object;
+};
+ko.exportProperty = function(owner, publicName, object) {
+ owner[publicName] = object;
+};
+ko.version = "2.2.0";
+
+ko.exportSymbol('version', ko.version);
+ko.utils = new (function () {
+ var stringTrimRegex = /^(\s|\u00A0)+|(\s|\u00A0)+$/g;
+
+ // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
+ var knownEvents = {}, knownEventTypesByEventName = {};
+ var keyEventTypeName = /Firefox\/2/i.test(navigator.userAgent) ? 'KeyboardEvent' : 'UIEvents';
+ knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
+ knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
+ for (var eventType in knownEvents) {
+ var knownEventsForType = knownEvents[eventType];
+ if (knownEventsForType.length) {
+ for (var i = 0, j = knownEventsForType.length; i < j; i++)
+ knownEventTypesByEventName[knownEventsForType[i]] = eventType;
+ }
+ }
+ var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
+
+ // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
+ // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
+ // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
+ // If there is a future need to detect specific versions of IE10+, we will amend this.
+ var ieVersion = (function() {
+ var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
+
+ // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
+ while (
+ div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
+ iElems[0]
+ );
+ return version > 4 ? version : undefined;
+ }());
+ var isIe6 = ieVersion === 6,
+ isIe7 = ieVersion === 7;
+
+ function isClickOnCheckableElement(element, eventType) {
+ if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
+ if (eventType.toLowerCase() != "click") return false;
+ var inputType = element.type;
+ return (inputType == "checkbox") || (inputType == "radio");
+ }
+
+ return {
+ fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
+
+ arrayForEach: function (array, action) {
+ for (var i = 0, j = array.length; i < j; i++)
+ action(array[i]);
+ },
+
+ arrayIndexOf: function (array, item) {
+ if (typeof Array.prototype.indexOf == "function")
+ return Array.prototype.indexOf.call(array, item);
+ for (var i = 0, j = array.length; i < j; i++)
+ if (array[i] === item)
+ return i;
+ return -1;
+ },
+
+ arrayFirst: function (array, predicate, predicateOwner) {
+ for (var i = 0, j = array.length; i < j; i++)
+ if (predicate.call(predicateOwner, array[i]))
+ return array[i];
+ return null;
+ },
+
+ arrayRemoveItem: function (array, itemToRemove) {
+ var index = ko.utils.arrayIndexOf(array, itemToRemove);
+ if (index >= 0)
+ array.splice(index, 1);
+ },
+
+ arrayGetDistinctValues: function (array) {
+ array = array || [];
+ var result = [];
+ for (var i = 0, j = array.length; i < j; i++) {
+ if (ko.utils.arrayIndexOf(result, array[i]) < 0)
+ result.push(array[i]);
+ }
+ return result;
+ },
+
+ arrayMap: function (array, mapping) {
+ array = array || [];
+ var result = [];
+ for (var i = 0, j = array.length; i < j; i++)
+ result.push(mapping(array[i]));
+ return result;
+ },
+
+ arrayFilter: function (array, predicate) {
+ array = array || [];
+ var result = [];
+ for (var i = 0, j = array.length; i < j; i++)
+ if (predicate(array[i]))
+ result.push(array[i]);
+ return result;
+ },
+
+ arrayPushAll: function (array, valuesToPush) {
+ if (valuesToPush instanceof Array)
+ array.push.apply(array, valuesToPush);
+ else
+ for (var i = 0, j = valuesToPush.length; i < j; i++)
+ array.push(valuesToPush[i]);
+ return array;
+ },
+
+ extend: function (target, source) {
+ if (source) {
+ for(var prop in source) {
+ if(source.hasOwnProperty(prop)) {
+ target[prop] = source[prop];
+ }
+ }
+ }
+ return target;
+ },
+
+ emptyDomNode: function (domNode) {
+ while (domNode.firstChild) {
+ ko.removeNode(domNode.firstChild);
+ }
+ },
+
+ moveCleanedNodesToContainerElement: function(nodes) {
+ // Ensure it's a real array, as we're about to reparent the nodes and
+ // we don't want the underlying collection to change while we're doing that.
+ var nodesArray = ko.utils.makeArray(nodes);
+
+ var container = document.createElement('div');
+ for (var i = 0, j = nodesArray.length; i < j; i++) {
+ container.appendChild(ko.cleanNode(nodesArray[i]));
+ }
+ return container;
+ },
+
+ cloneNodes: function (nodesArray, shouldCleanNodes) {
+ for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
+ var clonedNode = nodesArray[i].cloneNode(true);
+ newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
+ }
+ return newNodesArray;
+ },
+
+ setDomNodeChildren: function (domNode, childNodes) {
+ ko.utils.emptyDomNode(domNode);
+ if (childNodes) {
+ for (var i = 0, j = childNodes.length; i < j; i++)
+ domNode.appendChild(childNodes[i]);
+ }
+ },
+
+ replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
+ var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
+ if (nodesToReplaceArray.length > 0) {
+ var insertionPoint = nodesToReplaceArray[0];
+ var parent = insertionPoint.parentNode;
+ for (var i = 0, j = newNodesArray.length; i < j; i++)
+ parent.insertBefore(newNodesArray[i], insertionPoint);
+ for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
+ ko.removeNode(nodesToReplaceArray[i]);
+ }
+ }
+ },
+
+ setOptionNodeSelectionState: function (optionNode, isSelected) {
+ // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
+ if (ieVersion < 7)
+ optionNode.setAttribute("selected", isSelected);
+ else
+ optionNode.selected = isSelected;
+ },
+
+ stringTrim: function (string) {
+ return (string || "").replace(stringTrimRegex, "");
+ },
+
+ stringTokenize: function (string, delimiter) {
+ var result = [];
+ var tokens = (string || "").split(delimiter);
+ for (var i = 0, j = tokens.length; i < j; i++) {
+ var trimmed = ko.utils.stringTrim(tokens[i]);
+ if (trimmed !== "")
+ result.push(trimmed);
+ }
+ return result;
+ },
+
+ stringStartsWith: function (string, startsWith) {
+ string = string || "";
+ if (startsWith.length > string.length)
+ return false;
+ return string.substring(0, startsWith.length) === startsWith;
+ },
+
+ domNodeIsContainedBy: function (node, containedByNode) {
+ if (containedByNode.compareDocumentPosition)
+ return (containedByNode.compareDocumentPosition(node) & 16) == 16;
+ while (node != null) {
+ if (node == containedByNode)
+ return true;
+ node = node.parentNode;
+ }
+ return false;
+ },
+
+ domNodeIsAttachedToDocument: function (node) {
+ return ko.utils.domNodeIsContainedBy(node, node.ownerDocument);
+ },
+
+ tagNameLower: function(element) {
+ // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
+ // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
+ // we don't need to do the .toLowerCase() as it will always be lower case anyway.
+ return element && element.tagName && element.tagName.toLowerCase();
+ },
+
+ registerEventHandler: function (element, eventType, handler) {
+ var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
+ if (!mustUseAttachEvent && typeof jQuery != "undefined") {
+ if (isClickOnCheckableElement(element, eventType)) {
+ // For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
+ // it toggles the element checked state *after* the click event handlers run, whereas native
+ // click events toggle the checked state *before* the event handler.
+ // Fix this by intecepting the handler and applying the correct checkedness before it runs.
+ var originalHandler = handler;
+ handler = function(event, eventData) {
+ var jQuerySuppliedCheckedState = this.checked;
+ if (eventData)
+ this.checked = eventData.checkedStateBeforeEvent !== true;
+ originalHandler.call(this, event);
+ this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
+ };
+ }
+ jQuery(element)['bind'](eventType, handler);
+ } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
+ element.addEventListener(eventType, handler, false);
+ else if (typeof element.attachEvent != "undefined")
+ element.attachEvent("on" + eventType, function (event) {
+ handler.call(element, event);
+ });
+ else
+ throw new Error("Browser doesn't support addEventListener or attachEvent");
+ },
+
+ triggerEvent: function (element, eventType) {
+ if (!(element && element.nodeType))
+ throw new Error("element must be a DOM node when calling triggerEvent");
+
+ if (typeof jQuery != "undefined") {
+ var eventData = [];
+ if (isClickOnCheckableElement(element, eventType)) {
+ // Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
+ eventData.push({ checkedStateBeforeEvent: element.checked });
+ }
+ jQuery(element)['trigger'](eventType, eventData);
+ } else if (typeof document.createEvent == "function") {
+ if (typeof element.dispatchEvent == "function") {
+ var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
+ var event = document.createEvent(eventCategory);
+ event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
+ element.dispatchEvent(event);
+ }
+ else
+ throw new Error("The supplied element doesn't support dispatchEvent");
+ } else if (typeof element.fireEvent != "undefined") {
+ // Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
+ // so to make it consistent, we'll do it manually here
+ if (isClickOnCheckableElement(element, eventType))
+ element.checked = element.checked !== true;
+ element.fireEvent("on" + eventType);
+ }
+ else
+ throw new Error("Browser doesn't support triggering events");
+ },
+
+ unwrapObservable: function (value) {
+ return ko.isObservable(value) ? value() : value;
+ },
+
+ peekObservable: function (value) {
+ return ko.isObservable(value) ? value.peek() : value;
+ },
+
+ toggleDomNodeCssClass: function (node, classNames, shouldHaveClass) {
+ if (classNames) {
+ var cssClassNameRegex = /[\w-]+/g,
+ currentClassNames = node.className.match(cssClassNameRegex) || [];
+ ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
+ var indexOfClass = ko.utils.arrayIndexOf(currentClassNames, className);
+ if (indexOfClass >= 0) {
+ if (!shouldHaveClass)
+ currentClassNames.splice(indexOfClass, 1);
+ } else {
+ if (shouldHaveClass)
+ currentClassNames.push(className);
+ }
+ });
+ node.className = currentClassNames.join(" ");
+ }
+ },
+
+ setTextContent: function(element, textContent) {
+ var value = ko.utils.unwrapObservable(textContent);
+ if ((value === null) || (value === undefined))
+ value = "";
+
+ if (element.nodeType === 3) {
+ element.data = value;
+ } else {
+ // We need there to be exactly one child: a text node.
+ // If there are no children, more than one, or if it's not a text node,
+ // we'll clear everything and create a single text node.
+ var innerTextNode = ko.virtualElements.firstChild(element);
+ if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
+ ko.virtualElements.setDomNodeChildren(element, [document.createTextNode(value)]);
+ } else {
+ innerTextNode.data = value;
+ }
+
+ ko.utils.forceRefresh(element);
+ }
+ },
+
+ setElementName: function(element, name) {
+ element.name = name;
+
+ // Workaround IE 6/7 issue
+ // - https://github.com/SteveSanderson/knockout/issues/197
+ // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
+ if (ieVersion <= 7) {
+ try {
+ element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
+ }
+ catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
+ }
+ },
+
+ forceRefresh: function(node) {
+ // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
+ if (ieVersion >= 9) {
+ // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
+ var elem = node.nodeType == 1 ? node : node.parentNode;
+ if (elem.style)
+ elem.style.zoom = elem.style.zoom;
+ }
+ },
+
+ ensureSelectElementIsRenderedCorrectly: function(selectElement) {
+ // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
+ // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
+ if (ieVersion >= 9) {
+ var originalWidth = selectElement.style.width;
+ selectElement.style.width = 0;
+ selectElement.style.width = originalWidth;
+ }
+ },
+
+ range: function (min, max) {
+ min = ko.utils.unwrapObservable(min);
+ max = ko.utils.unwrapObservable(max);
+ var result = [];
+ for (var i = min; i <= max; i++)
+ result.push(i);
+ return result;
+ },
+
+ makeArray: function(arrayLikeObject) {
+ var result = [];
+ for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
+ result.push(arrayLikeObject[i]);
+ };
+ return result;
+ },
+
+ isIe6 : isIe6,
+ isIe7 : isIe7,
+ ieVersion : ieVersion,
+
+ getFormFields: function(form, fieldName) {
+ var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
+ var isMatchingField = (typeof fieldName == 'string')
+ ? function(field) { return field.name === fieldName }
+ : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
+ var matches = [];
+ for (var i = fields.length - 1; i >= 0; i--) {
+ if (isMatchingField(fields[i]))
+ matches.push(fields[i]);
+ };
+ return matches;
+ },
+
+ parseJson: function (jsonString) {
+ if (typeof jsonString == "string") {
+ jsonString = ko.utils.stringTrim(jsonString);
+ if (jsonString) {
+ if (window.JSON && window.JSON.parse) // Use native parsing where available
+ return window.JSON.parse(jsonString);
+ return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
+ }
+ }
+ return null;
+ },
+
+ stringifyJson: function (data, replacer, space) { // replacer and space are optional
+ if ((typeof JSON == "undefined") || (typeof JSON.stringify == "undefined"))
+ throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
+ return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
+ },
+
+ postJson: function (urlOrForm, data, options) {
+ options = options || {};
+ var params = options['params'] || {};
+ var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
+ var url = urlOrForm;
+
+ // If we were given a form, use its 'action' URL and pick out any requested field values
+ if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
+ var originalForm = urlOrForm;
+ url = originalForm.action;
+ for (var i = includeFields.length - 1; i >= 0; i--) {
+ var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
+ for (var j = fields.length - 1; j >= 0; j--)
+ params[fields[j].name] = fields[j].value;
+ }
+ }
+
+ data = ko.utils.unwrapObservable(data);
+ var form = document.createElement("form");
+ form.style.display = "none";
+ form.action = url;
+ form.method = "post";
+ for (var key in data) {
+ var input = document.createElement("input");
+ input.name = key;
+ input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
+ form.appendChild(input);
+ }
+ for (var key in params) {
+ var input = document.createElement("input");
+ input.name = key;
+ input.value = params[key];
+ form.appendChild(input);
+ }
+ document.body.appendChild(form);
+ options['submitter'] ? options['submitter'](form) : form.submit();
+ setTimeout(function () { form.parentNode.removeChild(form); }, 0);
+ }
+ }
+})();
+
+ko.exportSymbol('utils', ko.utils);
+ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
+ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
+ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
+ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
+ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
+ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
+ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
+ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
+ko.exportSymbol('utils.extend', ko.utils.extend);
+ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
+ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
+ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
+ko.exportSymbol('utils.postJson', ko.utils.postJson);
+ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
+ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
+ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
+ko.exportSymbol('utils.range', ko.utils.range);
+ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
+ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
+ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
+
+if (!Function.prototype['bind']) {
+ // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
+ // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
+ Function.prototype['bind'] = function (object) {
+ var originalFunction = this, args = Array.prototype.slice.call(arguments), object = args.shift();
+ return function () {
+ return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
+ };
+ };
+}
+
+ko.utils.domData = new (function () {
+ var uniqueId = 0;
+ var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
+ var dataStore = {};
+ return {
+ get: function (node, key) {
+ var allDataForNode = ko.utils.domData.getAll(node, false);
+ return allDataForNode === undefined ? undefined : allDataForNode[key];
+ },
+ set: function (node, key, value) {
+ if (value === undefined) {
+ // Make sure we don't actually create a new domData key if we are actually deleting a value
+ if (ko.utils.domData.getAll(node, false) === undefined)
+ return;
+ }
+ var allDataForNode = ko.utils.domData.getAll(node, true);
+ allDataForNode[key] = value;
+ },
+ getAll: function (node, createIfNotFound) {
+ var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
+ var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
+ if (!hasExistingDataStore) {
+ if (!createIfNotFound)
+ return undefined;
+ dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
+ dataStore[dataStoreKey] = {};
+ }
+ return dataStore[dataStoreKey];
+ },
+ clear: function (node) {
+ var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
+ if (dataStoreKey) {
+ delete dataStore[dataStoreKey];
+ node[dataStoreKeyExpandoPropertyName] = null;
+ return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
+ }
+ return false;
+ }
+ }
+})();
+
+ko.exportSymbol('utils.domData', ko.utils.domData);
+ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
+
+ko.utils.domNodeDisposal = new (function () {
+ var domDataKey = "__ko_domNodeDisposal__" + (new Date).getTime();
+ var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
+ var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
+
+ function getDisposeCallbacksCollection(node, createIfNotFound) {
+ var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
+ if ((allDisposeCallbacks === undefined) && createIfNotFound) {
+ allDisposeCallbacks = [];
+ ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
+ }
+ return allDisposeCallbacks;
+ }
+ function destroyCallbacksCollection(node) {
+ ko.utils.domData.set(node, domDataKey, undefined);
+ }
+
+ function cleanSingleNode(node) {
+ // Run all the dispose callbacks
+ var callbacks = getDisposeCallbacksCollection(node, false);
+ if (callbacks) {
+ callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
+ for (var i = 0; i < callbacks.length; i++)
+ callbacks[i](node);
+ }
+
+ // Also erase the DOM data
+ ko.utils.domData.clear(node);
+
+ // Special support for jQuery here because it's so commonly used.
+ // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
+ // so notify it to tear down any resources associated with the node & descendants here.
+ if ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
+ jQuery['cleanData']([node]);
+
+ // Also clear any immediate-child comment nodes, as these wouldn't have been found by
+ // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
+ if (cleanableNodeTypesWithDescendants[node.nodeType])
+ cleanImmediateCommentTypeChildren(node);
+ }
+
+ function cleanImmediateCommentTypeChildren(nodeWithChildren) {
+ var child, nextChild = nodeWithChildren.firstChild;
+ while (child = nextChild) {
+ nextChild = child.nextSibling;
+ if (child.nodeType === 8)
+ cleanSingleNode(child);
+ }
+ }
+
+ return {
+ addDisposeCallback : function(node, callback) {
+ if (typeof callback != "function")
+ throw new Error("Callback must be a function");
+ getDisposeCallbacksCollection(node, true).push(callback);
+ },
+
+ removeDisposeCallback : function(node, callback) {
+ var callbacksCollection = getDisposeCallbacksCollection(node, false);
+ if (callbacksCollection) {
+ ko.utils.arrayRemoveItem(callbacksCollection, callback);
+ if (callbacksCollection.length == 0)
+ destroyCallbacksCollection(node);
+ }
+ },
+
+ cleanNode : function(node) {
+ // First clean this node, where applicable
+ if (cleanableNodeTypes[node.nodeType]) {
+ cleanSingleNode(node);
+
+ // ... then its descendants, where applicable
+ if (cleanableNodeTypesWithDescendants[node.nodeType]) {
+ // Clone the descendants list in case it changes during iteration
+ var descendants = [];
+ ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
+ for (var i = 0, j = descendants.length; i < j; i++)
+ cleanSingleNode(descendants[i]);
+ }
+ }
+ return node;
+ },
+
+ removeNode : function(node) {
+ ko.cleanNode(node);
+ if (node.parentNode)
+ node.parentNode.removeChild(node);
+ }
+ }
+})();
+ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
+ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
+ko.exportSymbol('cleanNode', ko.cleanNode);
+ko.exportSymbol('removeNode', ko.removeNode);
+ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
+ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
+ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
+(function () {
+ var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
+
+ function simpleHtmlParse(html) {
+ // Based on jQuery's "clean" function, but only accounting for table-related elements.
+ // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
+
+ // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
+ // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
+ // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
+ // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
+
+ // Trim whitespace, otherwise indexOf won't work as expected
+ var tags = ko.utils.stringTrim(html).toLowerCase(), div = document.createElement("div");
+
+ // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
+ var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
+ !tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
+ (!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
+ /* anything else */ [0, "", ""];
+
+ // Go to html and back, then peel off extra wrappers
+ // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
+ var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
+ if (typeof window['innerShiv'] == "function") {
+ div.appendChild(window['innerShiv'](markup));
+ } else {
+ div.innerHTML = markup;
+ }
+
+ // Move to the right depth
+ while (wrap[0]--)
+ div = div.lastChild;
+
+ return ko.utils.makeArray(div.lastChild.childNodes);
+ }
+
+ function jQueryHtmlParse(html) {
+ var elems = jQuery['clean']([html]);
+
+ // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
+ // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
+ // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
+ if (elems && elems[0]) {
+ // Find the top-most parent element that's a direct child of a document fragment
+ var elem = elems[0];
+ while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
+ elem = elem.parentNode;
+ // ... then detach it
+ if (elem.parentNode)
+ elem.parentNode.removeChild(elem);
+ }
+
+ return elems;
+ }
+
+ ko.utils.parseHtmlFragment = function(html) {
+ return typeof jQuery != 'undefined' ? jQueryHtmlParse(html) // As below, benefit from jQuery's optimisations where possible
+ : simpleHtmlParse(html); // ... otherwise, this simple logic will do in most common cases.
+ };
+
+ ko.utils.setHtml = function(node, html) {
+ ko.utils.emptyDomNode(node);
+
+ // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
+ html = ko.utils.unwrapObservable(html);
+
+ if ((html !== null) && (html !== undefined)) {
+ if (typeof html != 'string')
+ html = html.toString();
+
+ // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
+ // for example <tr> elements which are not normally allowed to exist on their own.
+ // If you've referenced jQuery we'll use that rather than duplicating its code.
+ if (typeof jQuery != 'undefined') {
+ jQuery(node)['html'](html);
+ } else {
+ // ... otherwise, use KO's own parsing logic.
+ var parsedNodes = ko.utils.parseHtmlFragment(html);
+ for (var i = 0; i < parsedNodes.length; i++)
+ node.appendChild(parsedNodes[i]);
+ }
+ }
+ };
+})();
+
+ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
+ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
+
+ko.memoization = (function () {
+ var memos = {};
+
+ function randomMax8HexChars() {
+ return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
+ }
+ function generateRandomId() {
+ return randomMax8HexChars() + randomMax8HexChars();
+ }
+ function findMemoNodes(rootNode, appendToArray) {
+ if (!rootNode)
+ return;
+ if (rootNode.nodeType == 8) {
+ var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
+ if (memoId != null)
+ appendToArray.push({ domNode: rootNode, memoId: memoId });
+ } else if (rootNode.nodeType == 1) {
+ for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
+ findMemoNodes(childNodes[i], appendToArray);
+ }
+ }
+
+ return {
+ memoize: function (callback) {
+ if (typeof callback != "function")
+ throw new Error("You can only pass a function to ko.memoization.memoize()");
+ var memoId = generateRandomId();
+ memos[memoId] = callback;
+ return "<!--[ko_memo:" + memoId + "]-->";
+ },
+
+ unmemoize: function (memoId, callbackParams) {
+ var callback = memos[memoId];
+ if (callback === undefined)
+ throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
+ try {
+ callback.apply(null, callbackParams || []);
+ return true;
+ }
+ finally { delete memos[memoId]; }
+ },
+
+ unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
+ var memos = [];
+ findMemoNodes(domNode, memos);
+ for (var i = 0, j = memos.length; i < j; i++) {
+ var node = memos[i].domNode;
+ var combinedParams = [node];
+ if (extraCallbackParamsArray)
+ ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
+ ko.memoization.unmemoize(memos[i].memoId, combinedParams);
+ node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
+ if (node.parentNode)
+ node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
+ }
+ },
+
+ parseMemoText: function (memoText) {
+ var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
+ return match ? match[1] : null;
+ }
+ };
+})();
+
+ko.exportSymbol('memoization', ko.memoization);
+ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
+ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
+ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
+ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
+ko.extenders = {
+ 'throttle': function(target, timeout) {
+ // Throttling means two things:
+
+ // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
+ // notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
+ target['throttleEvaluation'] = timeout;
+
+ // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
+ // so the target cannot change value synchronously or faster than a certain rate
+ var writeTimeoutInstance = null;
+ return ko.dependentObservable({
+ 'read': target,
+ 'write': function(value) {
+ clearTimeout(writeTimeoutInstance);
+ writeTimeoutInstance = setTimeout(function() {
+ target(value);
+ }, timeout);
+ }
+ });
+ },
+
+ 'notify': function(target, notifyWhen) {
+ target["equalityComparer"] = notifyWhen == "always"
+ ? function() { return false } // Treat all values as not equal
+ : ko.observable["fn"]["equalityComparer"];
+ return target;
+ }
+};
+
+function applyExtenders(requestedExtenders) {
+ var target = this;
+ if (requestedExtenders) {
+ for (var key in requestedExtenders) {
+ var extenderHandler = ko.extenders[key];
+ if (typeof extenderHandler == 'function') {
+ target = extenderHandler(target, requestedExtenders[key]);
+ }
+ }
+ }
+ return target;
+}
+
+ko.exportSymbol('extenders', ko.extenders);
+
+ko.subscription = function (target, callback, disposeCallback) {
+ this.target = target;
+ this.callback = callback;
+ this.disposeCallback = disposeCallback;
+ ko.exportProperty(this, 'dispose', this.dispose);
+};
+ko.subscription.prototype.dispose = function () {
+ this.isDisposed = true;
+ this.disposeCallback();
+};
+
+ko.subscribable = function () {
+ this._subscriptions = {};
+
+ ko.utils.extend(this, ko.subscribable['fn']);
+ ko.exportProperty(this, 'subscribe', this.subscribe);
+ ko.exportProperty(this, 'extend', this.extend);
+ ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
+}
+
+var defaultEvent = "change";
+
+ko.subscribable['fn'] = {
+ subscribe: function (callback, callbackTarget, event) {
+ event = event || defaultEvent;
+ var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
+
+ var subscription = new ko.subscription(this, boundCallback, function () {
+ ko.utils.arrayRemoveItem(this._subscriptions[event], subscription);
+ }.bind(this));
+
+ if (!this._subscriptions[event])
+ this._subscriptions[event] = [];
+ this._subscriptions[event].push(subscription);
+ return subscription;
+ },
+
+ "notifySubscribers": function (valueToNotify, event) {
+ event = event || defaultEvent;
+ if (this._subscriptions[event]) {
+ ko.dependencyDetection.ignore(function() {
+ ko.utils.arrayForEach(this._subscriptions[event].slice(0), function (subscription) {
+ // In case a subscription was disposed during the arrayForEach cycle, check
+ // for isDisposed on each subscription before invoking its callback
+ if (subscription && (subscription.isDisposed !== true))
+ subscription.callback(valueToNotify);
+ });
+ }, this);
+ }
+ },
+
+ getSubscriptionsCount: function () {
+ var total = 0;
+ for (var eventName in this._subscriptions) {
+ if (this._subscriptions.hasOwnProperty(eventName))
+ total += this._subscriptions[eventName].length;
+ }
+ return total;
+ },
+
+ extend: applyExtenders
+};
+
+
+ko.isSubscribable = function (instance) {
+ return typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
+};
+
+ko.exportSymbol('subscribable', ko.subscribable);
+ko.exportSymbol('isSubscribable', ko.isSubscribable);
+
+ko.dependencyDetection = (function () {
+ var _frames = [];
+
+ return {
+ begin: function (callback) {
+ _frames.push({ callback: callback, distinctDependencies:[] });
+ },
+
+ end: function () {
+ _frames.pop();
+ },
+
+ registerDependency: function (subscribable) {
+ if (!ko.isSubscribable(subscribable))
+ throw new Error("Only subscribable things can act as dependencies");
+ if (_frames.length > 0) {
+ var topFrame = _frames[_frames.length - 1];
+ if (!topFrame || ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
+ return;
+ topFrame.distinctDependencies.push(subscribable);
+ topFrame.callback(subscribable);
+ }
+ },
+
+ ignore: function(callback, callbackTarget, callbackArgs) {
+ try {
+ _frames.push(null);
+ return callback.apply(callbackTarget, callbackArgs || []);
+ } finally {
+ _frames.pop();
+ }
+ }
+ };
+})();
+var primitiveTypes = { 'undefined':true, 'boolean':true, 'number':true, 'string':true };
+
+ko.observable = function (initialValue) {
+ var _latestValue = initialValue;
+
+ function observable() {
+ if (arguments.length > 0) {
+ // Write
+
+ // Ignore writes if the value hasn't changed
+ if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
+ observable.valueWillMutate();
+ _latestValue = arguments[0];
+ if (DEBUG) observable._latestValue = _latestValue;
+ observable.valueHasMutated();
+ }
+ return this; // Permits chained assignments
+ }
+ else {
+ // Read
+ ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
+ return _latestValue;
+ }
+ }
+ if (DEBUG) observable._latestValue = _latestValue;
+ ko.subscribable.call(observable);
+ observable.peek = function() { return _latestValue };
+ observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
+ observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
+ ko.utils.extend(observable, ko.observable['fn']);
+
+ ko.exportProperty(observable, 'peek', observable.peek);
+ ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
+ ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);
+
+ return observable;
+}
+
+ko.observable['fn'] = {
+ "equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
+ var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
+ return oldValueIsPrimitive ? (a === b) : false;
+ }
+};
+
+var protoProperty = ko.observable.protoProperty = "__ko_proto__";
+ko.observable['fn'][protoProperty] = ko.observable;
+
+ko.hasPrototype = function(instance, prototype) {
+ if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
+ if (instance[protoProperty] === prototype) return true;
+ return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
+};
+
+ko.isObservable = function (instance) {
+ return ko.hasPrototype(instance, ko.observable);
+}
+ko.isWriteableObservable = function (instance) {
+ // Observable
+ if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
+ return true;
+ // Writeable dependent observable
+ if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
+ return true;
+ // Anything else
+ return false;
+}
+
+
+ko.exportSymbol('observable', ko.observable);
+ko.exportSymbol('isObservable', ko.isObservable);
+ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
+ko.observableArray = function (initialValues) {
+ if (arguments.length == 0) {
+ // Zero-parameter constructor initializes to empty array
+ initialValues = [];
+ }
+ if ((initialValues !== null) && (initialValues !== undefined) && !('length' in initialValues))
+ throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
+
+ var result = ko.observable(initialValues);
+ ko.utils.extend(result, ko.observableArray['fn']);
+ return result;
+}
+
+ko.observableArray['fn'] = {
+ 'remove': function (valueOrPredicate) {
+ var underlyingArray = this.peek();
+ var removedValues = [];
+ var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
+ for (var i = 0; i < underlyingArray.length; i++) {
+ var value = underlyingArray[i];
+ if (predicate(value)) {
+ if (removedValues.length === 0) {
+ this.valueWillMutate();
+ }
+ removedValues.push(value);
+ underlyingArray.splice(i, 1);
+ i--;
+ }
+ }
+ if (removedValues.length) {
+ this.valueHasMutated();
+ }
+ return removedValues;
+ },
+
+ 'removeAll': function (arrayOfValues) {
+ // If you passed zero args, we remove everything
+ if (arrayOfValues === undefined) {
+ var underlyingArray = this.peek();
+ var allValues = underlyingArray.slice(0);
+ this.valueWillMutate();
+ underlyingArray.splice(0, underlyingArray.length);
+ this.valueHasMutated();
+ return allValues;
+ }
+ // If you passed an arg, we interpret it as an array of entries to remove
+ if (!arrayOfValues)
+ return [];
+ return this['remove'](function (value) {
+ return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
+ });
+ },
+
+ 'destroy': function (valueOrPredicate) {
+ var underlyingArray = this.peek();
+ var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
+ this.valueWillMutate();
+ for (var i = underlyingArray.length - 1; i >= 0; i--) {
+ var value = underlyingArray[i];
+ if (predicate(value))
+ underlyingArray[i]["_destroy"] = true;
+ }
+ this.valueHasMutated();
+ },
+
+ 'destroyAll': function (arrayOfValues) {
+ // If you passed zero args, we destroy everything
+ if (arrayOfValues === undefined)
+ return this['destroy'](function() { return true });
+
+ // If you passed an arg, we interpret it as an array of entries to destroy
+ if (!arrayOfValues)
+ return [];
+ return this['destroy'](function (value) {
+ return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
+ });
+ },
+
+ 'indexOf': function (item) {
+ var underlyingArray = this();
+ return ko.utils.arrayIndexOf(underlyingArray, item);
+ },
+
+ 'replace': function(oldItem, newItem) {
+ var index = this['indexOf'](oldItem);
+ if (index >= 0) {
+ this.valueWillMutate();
+ this.peek()[index] = newItem;
+ this.valueHasMutated();
+ }
+ }
+}
+
+// Populate ko.observableArray.fn with read/write functions from native arrays
+// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
+// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
+ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
+ ko.observableArray['fn'][methodName] = function () {
+ // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
+ // (for consistency with mutating regular observables)
+ var underlyingArray = this.peek();
+ this.valueWillMutate();
+ var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
+ this.valueHasMutated();
+ return methodCallResult;
+ };
+});
+
+// Populate ko.observableArray.fn with read-only functions from native arrays
+ko.utils.arrayForEach(["slice"], function (methodName) {
+ ko.observableArray['fn'][methodName] = function () {
+ var underlyingArray = this();
+ return underlyingArray[methodName].apply(underlyingArray, arguments);
+ };
+});
+
+ko.exportSymbol('observableArray', ko.observableArray);
+ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
+ var _latestValue,
+ _hasBeenEvaluated = false,
+ _isBeingEvaluated = false,
+ readFunction = evaluatorFunctionOrOptions;
+
+ if (readFunction && typeof readFunction == "object") {
+ // Single-parameter syntax - everything is on this "options" param
+ options = readFunction;
+ readFunction = options["read"];
+ } else {
+ // Multi-parameter syntax - construct the options according to the params passed
+ options = options || {};
+ if (!readFunction)
+ readFunction = options["read"];
+ }
+ if (typeof readFunction != "function")
+ throw new Error("Pass a function that returns the value of the ko.computed");
+
+ function addSubscriptionToDependency(subscribable) {
+ _subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync));
+ }
+
+ function disposeAllSubscriptionsToDependencies() {
+ ko.utils.arrayForEach(_subscriptionsToDependencies, function (subscription) {
+ subscription.dispose();
+ });
+ _subscriptionsToDependencies = [];
+ }
+
+ function evaluatePossiblyAsync() {
+ var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
+ if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
+ clearTimeout(evaluationTimeoutInstance);
+ evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
+ } else
+ evaluateImmediate();
+ }
+
+ function evaluateImmediate() {
+ if (_isBeingEvaluated) {
+ // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
+ // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
+ // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
+ // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
+ return;
+ }
+
+ // Don't dispose on first evaluation, because the "disposeWhen" callback might
+ // e.g., dispose when the associated DOM element isn't in the doc, and it's not
+ // going to be in the doc until *after* the first evaluation
+ if (_hasBeenEvaluated && disposeWhen()) {
+ dispose();
+ return;
+ }
+
+ _isBeingEvaluated = true;
+ try {
+ // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
+ // Then, during evaluation, we cross off any that are in fact still being used.
+ var disposalCandidates = ko.utils.arrayMap(_subscriptionsToDependencies, function(item) {return item.target;});
+
+ ko.dependencyDetection.begin(function(subscribable) {
+ var inOld;
+ if ((inOld = ko.utils.arrayIndexOf(disposalCandidates, subscribable)) >= 0)
+ disposalCandidates[inOld] = undefined; // Don't want to dispose this subscription, as it's still being used
+ else
+ addSubscriptionToDependency(subscribable); // Brand new subscription - add it
+ });
+
+ var newValue = readFunction.call(evaluatorFunctionTarget);
+
+ // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
+ for (var i = disposalCandidates.length - 1; i >= 0; i--) {
+ if (disposalCandidates[i])
+ _subscriptionsToDependencies.splice(i, 1)[0].dispose();
+ }
+ _hasBeenEvaluated = true;
+
+ dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
+ _latestValue = newValue;
+ if (DEBUG) dependentObservable._latestValue = _latestValue;
+ } finally {
+ ko.dependencyDetection.end();
+ }
+
+ dependentObservable["notifySubscribers"](_latestValue);
+ _isBeingEvaluated = false;
+ if (!_subscriptionsToDependencies.length)
+ dispose();
+ }
+
+ function dependentObservable() {
+ if (arguments.length > 0) {
+ if (typeof writeFunction === "function") {
+ // Writing a value
+ writeFunction.apply(evaluatorFunctionTarget, arguments);
+ } else {
+ throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
+ }
+ return this; // Permits chained assignments
+ } else {
+ // Reading the value
+ if (!_hasBeenEvaluated)
+ evaluateImmediate();
+ ko.dependencyDetection.registerDependency(dependentObservable);
+ return _latestValue;
+ }
+ }
+
+ function peek() {
+ if (!_hasBeenEvaluated)
+ evaluateImmediate();
+ return _latestValue;
+ }
+
+ function isActive() {
+ return !_hasBeenEvaluated || _subscriptionsToDependencies.length > 0;
+ }
+
+ // By here, "options" is always non-null
+ var writeFunction = options["write"],
+ disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
+ disposeWhen = options["disposeWhen"] || options.disposeWhen || function() { return false; },
+ dispose = disposeAllSubscriptionsToDependencies,
+ _subscriptionsToDependencies = [],
+ evaluationTimeoutInstance = null;
+
+ if (!evaluatorFunctionTarget)
+ evaluatorFunctionTarget = options["owner"];
+
+ dependentObservable.peek = peek;
+ dependentObservable.getDependenciesCount = function () { return _subscriptionsToDependencies.length; };
+ dependentObservable.hasWriteFunction = typeof options["write"] === "function";
+ dependentObservable.dispose = function () { dispose(); };
+ dependentObservable.isActive = isActive;
+
+ ko.subscribable.call(dependentObservable);
+ ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);
+
+ ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
+ ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
+ ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
+ ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
+
+ // Evaluate, unless deferEvaluation is true
+ if (options['deferEvaluation'] !== true)
+ evaluateImmediate();
+
+ // Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values.
+ // But skip if isActive is false (there will never be any dependencies to dispose).
+ // (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
+ // plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
+ if (disposeWhenNodeIsRemoved && isActive()) {
+ dispose = function() {
+ ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, arguments.callee);
+ disposeAllSubscriptionsToDependencies();
+ };
+ ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
+ var existingDisposeWhenFunction = disposeWhen;
+ disposeWhen = function () {
+ return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || existingDisposeWhenFunction();
+ }
+ }
+
+ return dependentObservable;
+};
+
+ko.isComputed = function(instance) {
+ return ko.hasPrototype(instance, ko.dependentObservable);
+};
+
+var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
+ko.dependentObservable[protoProp] = ko.observable;
+
+ko.dependentObservable['fn'] = {};
+ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;
+
+ko.exportSymbol('dependentObservable', ko.dependentObservable);
+ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
+ko.exportSymbol('isComputed', ko.isComputed);
+
+(function() {
+ var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
+
+ ko.toJS = function(rootObject) {
+ if (arguments.length == 0)
+ throw new Error("When calling ko.toJS, pass the object you want to convert.");
+
+ // We just unwrap everything at every level in the object graph
+ return mapJsObjectGraph(rootObject, function(valueToMap) {
+ // Loop because an observable's value might in turn be another observable wrapper
+ for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
+ valueToMap = valueToMap();
+ return valueToMap;
+ });
+ };
+
+ ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
+ var plainJavaScriptObject = ko.toJS(rootObject);
+ return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
+ };
+
+ function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
+ visitedObjects = visitedObjects || new objectLookup();
+
+ rootObject = mapInputCallback(rootObject);
+ var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date));
+ if (!canHaveProperties)
+ return rootObject;
+
+ var outputProperties = rootObject instanceof Array ? [] : {};
+ visitedObjects.save(rootObject, outputProperties);
+
+ visitPropertiesOrArrayEntries(rootObject, function(indexer) {
+ var propertyValue = mapInputCallback(rootObject[indexer]);
+
+ switch (typeof propertyValue) {
+ case "boolean":
+ case "number":
+ case "string":
+ case "function":
+ outputProperties[indexer] = propertyValue;
+ break;
+ case "object":
+ case "undefined":
+ var previouslyMappedValue = visitedObjects.get(propertyValue);
+ outputProperties[indexer] = (previouslyMappedValue !== undefined)
+ ? previouslyMappedValue
+ : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
+ break;
+ }
+ });
+
+ return outputProperties;
+ }
+
+ function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
+ if (rootObject instanceof Array) {
+ for (var i = 0; i < rootObject.length; i++)
+ visitorCallback(i);
+
+ // For arrays, also respect toJSON property for custom mappings (fixes #278)
+ if (typeof rootObject['toJSON'] == 'function')
+ visitorCallback('toJSON');
+ } else {
+ for (var propertyName in rootObject)
+ visitorCallback(propertyName);
+ }
+ };
+
+ function objectLookup() {
+ var keys = [];
+ var values = [];
+ this.save = function(key, value) {
+ var existingIndex = ko.utils.arrayIndexOf(keys, key);
+ if (existingIndex >= 0)
+ values[existingIndex] = value;
+ else {
+ keys.push(key);
+ values.push(value);
+ }
+ };
+ this.get = function(key) {
+ var existingIndex = ko.utils.arrayIndexOf(keys, key);
+ return (existingIndex >= 0) ? values[existingIndex] : undefined;
+ };
+ };
+})();
+
+ko.exportSymbol('toJS', ko.toJS);
+ko.exportSymbol('toJSON', ko.toJSON);
+(function () {
+ var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
+
+ // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
+ // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
+ // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
+ ko.selectExtensions = {
+ readValue : function(element) {
+ switch (ko.utils.tagNameLower(element)) {
+ case 'option':
+ if (element[hasDomDataExpandoProperty] === true)
+ return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
+ return ko.utils.ieVersion <= 7
+ ? (element.getAttributeNode('value').specified ? element.value : element.text)
+ : element.value;
+ case 'select':
+ return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
+ default:
+ return element.value;
+ }
+ },
+
+ writeValue: function(element, value) {
+ switch (ko.utils.tagNameLower(element)) {
+ case 'option':
+ switch(typeof value) {
+ case "string":
+ ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
+ if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
+ delete element[hasDomDataExpandoProperty];
+ }
+ element.value = value;
+ break;
+ default:
+ // Store arbitrary object using DomData
+ ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
+ element[hasDomDataExpandoProperty] = true;
+
+ // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
+ element.value = typeof value === "number" ? value : "";
+ break;
+ }
+ break;
+ case 'select':
+ for (var i = element.options.length - 1; i >= 0; i--) {
+ if (ko.selectExtensions.readValue(element.options[i]) == value) {
+ element.selectedIndex = i;
+ break;
+ }
+ }
+ break;
+ default:
+ if ((value === null) || (value === undefined))
+ value = "";
+ element.value = value;
+ break;
+ }
+ }
+ };
+})();
+
+ko.exportSymbol('selectExtensions', ko.selectExtensions);
+ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
+ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
+ko.expressionRewriting = (function () {
+ var restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
+ var javaScriptReservedWords = ["true", "false"];
+
+ // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
+ // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
+ var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
+
+ function restoreTokens(string, tokens) {
+ var prevValue = null;
+ while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
+ prevValue = string;
+ string = string.replace(restoreCapturedTokensRegex, function (match, tokenIndex) {
+ return tokens[tokenIndex];
+ });
+ }
+ return string;
+ }
+
+ function getWriteableValue(expression) {
+ if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
+ return false;
+ var match = expression.match(javaScriptAssignmentTarget);
+ return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
+ }
+
+ function ensureQuoted(key) {
+ var trimmedKey = ko.utils.stringTrim(key);
+ switch (trimmedKey.length && trimmedKey.charAt(0)) {
+ case "'":
+ case '"':
+ return key;
+ default:
+ return "'" + trimmedKey + "'";
+ }
+ }
+
+ return {
+ bindingRewriteValidators: [],
+
+ parseObjectLiteral: function(objectLiteralString) {
+ // A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
+ // that is sufficient just to split an object literal string into a set of top-level key-value pairs
+
+ var str = ko.utils.stringTrim(objectLiteralString);
+ if (str.length < 3)
+ return [];
+ if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
+ str = str.substring(1, str.length - 1);
+
+ // Pull out any string literals and regex literals
+ var tokens = [];
+ var tokenStart = null, tokenEndChar;
+ for (var position = 0; position < str.length; position++) {
+ var c = str.charAt(position);
+ if (tokenStart === null) {
+ switch (c) {
+ case '"':
+ case "'":
+ case "/":
+ tokenStart = position;
+ tokenEndChar = c;
+ break;
+ }
+ } else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
+ var token = str.substring(tokenStart, position + 1);
+ tokens.push(token);
+ var replacement = "@ko_token_" + (tokens.length - 1) + "@";
+ str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
+ position -= (token.length - replacement.length);
+ tokenStart = null;
+ }
+ }
+
+ // Next pull out balanced paren, brace, and bracket blocks
+ tokenStart = null;
+ tokenEndChar = null;
+ var tokenDepth = 0, tokenStartChar = null;
+ for (var position = 0; position < str.length; position++) {
+ var c = str.charAt(position);
+ if (tokenStart === null) {
+ switch (c) {
+ case "{": tokenStart = position; tokenStartChar = c;
+ tokenEndChar = "}";
+ break;
+ case "(": tokenStart = position; tokenStartChar = c;
+ tokenEndChar = ")";
+ break;
+ case "[": tokenStart = position; tokenStartChar = c;
+ tokenEndChar = "]";
+ break;
+ }
+ }
+
+ if (c === tokenStartChar)
+ tokenDepth++;
+ else if (c === tokenEndChar) {
+ tokenDepth--;
+ if (tokenDepth === 0) {
+ var token = str.substring(tokenStart, position + 1);
+ tokens.push(token);
+ var replacement = "@ko_token_" + (tokens.length - 1) + "@";
+ str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
+ position -= (token.length - replacement.length);
+ tokenStart = null;
+ }
+ }
+ }
+
+ // Now we can safely split on commas to get the key/value pairs
+ var result = [];
+ var keyValuePairs = str.split(",");
+ for (var i = 0, j = keyValuePairs.length; i < j; i++) {
+ var pair = keyValuePairs[i];
+ var colonPos = pair.indexOf(":");
+ if ((colonPos > 0) && (colonPos < pair.length - 1)) {
+ var key = pair.substring(0, colonPos);
+ var value = pair.substring(colonPos + 1);
+ result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
+ } else {
+ result.push({ 'unknown': restoreTokens(pair, tokens) });
+ }
+ }
+ return result;
+ },
+
+ preProcessBindings: function (objectLiteralStringOrKeyValueArray) {
+ var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
+ ? ko.expressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
+ : objectLiteralStringOrKeyValueArray;
+ var resultStrings = [], propertyAccessorResultStrings = [];
+
+ var keyValueEntry;
+ for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
+ if (resultStrings.length > 0)
+ resultStrings.push(",");
+
+ if (keyValueEntry['key']) {
+ var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
+ resultStrings.push(quotedKey);
+ resultStrings.push(":");
+ resultStrings.push(val);
+
+ if (val = getWriteableValue(ko.utils.stringTrim(val))) {
+ if (propertyAccessorResultStrings.length > 0)
+ propertyAccessorResultStrings.push(", ");
+ propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
+ }
+ } else if (keyValueEntry['unknown']) {
+ resultStrings.push(keyValueEntry['unknown']);
+ }
+ }
+
+ var combinedResult = resultStrings.join("");
+ if (propertyAccessorResultStrings.length > 0) {
+ var allPropertyAccessors = propertyAccessorResultStrings.join("");
+ combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
+ }
+
+ return combinedResult;
+ },
+
+ keyValueArrayContainsKey: function(keyValueArray, key) {
+ for (var i = 0; i < keyValueArray.length; i++)
+ if (ko.utils.stringTrim(keyValueArray[i]['key']) == key)
+ return true;
+ return false;
+ },
+
+ // Internal, private KO utility for updating model properties from within bindings
+ // property: If the property being updated is (or might be) an observable, pass it here
+ // If it turns out to be a writable observable, it will be written to directly
+ // allBindingsAccessor: All bindings in the current execution context.
+ // This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
+ // key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
+ // value: The value to be written
+ // checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if
+ // it is !== existing value on that writable observable
+ writeValueToProperty: function(property, allBindingsAccessor, key, value, checkIfDifferent) {
+ if (!property || !ko.isWriteableObservable(property)) {
+ var propWriters = allBindingsAccessor()['_ko_property_writers'];
+ if (propWriters && propWriters[key])
+ propWriters[key](value);
+ } else if (!checkIfDifferent || property.peek() !== value) {
+ property(value);
+ }
+ }
+ };
+})();
+
+ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
+ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
+ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
+ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
+
+// For backward compatibility, define the following aliases. (Previously, these function names were misleading because
+// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
+ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
+ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);(function() {
+ // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
+ // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
+ // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
+ // of that virtual hierarchy
+ //
+ // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
+ // without having to scatter special cases all over the binding and templating code.
+
+ // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
+ // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
+ // So, use node.text where available, and node.nodeValue elsewhere
+ var commentNodesHaveTextProperty = document.createComment("test").text === "<!--test-->";
+
+ var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*-->$/ : /^\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*$/;
+ var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
+ var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
+
+ function isStartComment(node) {
+ return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
+ }
+
+ function isEndComment(node) {
+ return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(endCommentRegex);
+ }
+
+ function getVirtualChildren(startComment, allowUnbalanced) {
+ var currentNode = startComment;
+ var depth = 1;
+ var children = [];
+ while (currentNode = currentNode.nextSibling) {
+ if (isEndComment(currentNode)) {
+ depth--;
+ if (depth === 0)
+ return children;
+ }
+
+ children.push(currentNode);
+
+ if (isStartComment(currentNode))
+ depth++;
+ }
+ if (!allowUnbalanced)
+ throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
+ return null;
+ }
+
+ function getMatchingEndComment(startComment, allowUnbalanced) {
+ var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
+ if (allVirtualChildren) {
+ if (allVirtualChildren.length > 0)
+ return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
+ return startComment.nextSibling;
+ } else
+ return null; // Must have no matching end comment, and allowUnbalanced is true
+ }
+
+ function getUnbalancedChildTags(node) {
+ // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
+ // from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko -->
+ var childNode = node.firstChild, captureRemaining = null;
+ if (childNode) {
+ do {
+ if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes
+ captureRemaining.push(childNode);
+ else if (isStartComment(childNode)) {
+ var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
+ if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set
+ childNode = matchingEndComment;
+ else
+ captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
+ } else if (isEndComment(childNode)) {
+ captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
+ }
+ } while (childNode = childNode.nextSibling);
+ }
+ return captureRemaining;
+ }
+
+ ko.virtualElements = {
+ allowedBindings: {},
+
+ childNodes: function(node) {
+ return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
+ },
+
+ emptyNode: function(node) {
+ if (!isStartComment(node))
+ ko.utils.emptyDomNode(node);
+ else {
+ var virtualChildren = ko.virtualElements.childNodes(node);
+ for (var i = 0, j = virtualChildren.length; i < j; i++)
+ ko.removeNode(virtualChildren[i]);
+ }
+ },
+
+ setDomNodeChildren: function(node, childNodes) {
+ if (!isStartComment(node))
+ ko.utils.setDomNodeChildren(node, childNodes);
+ else {
+ ko.virtualElements.emptyNode(node);
+ var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
+ for (var i = 0, j = childNodes.length; i < j; i++)
+ endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
+ }
+ },
+
+ prepend: function(containerNode, nodeToPrepend) {
+ if (!isStartComment(containerNode)) {
+ if (containerNode.firstChild)
+ containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
+ else
+ containerNode.appendChild(nodeToPrepend);
+ } else {
+ // Start comments must always have a parent and at least one following sibling (the end comment)
+ containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
+ }
+ },
+
+ insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
+ if (!insertAfterNode) {
+ ko.virtualElements.prepend(containerNode, nodeToInsert);
+ } else if (!isStartComment(containerNode)) {
+ // Insert after insertion point
+ if (insertAfterNode.nextSibling)
+ containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
+ else
+ containerNode.appendChild(nodeToInsert);
+ } else {
+ // Children of start comments must always have a parent and at least one following sibling (the end comment)
+ containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
+ }
+ },
+
+ firstChild: function(node) {
+ if (!isStartComment(node))
+ return node.firstChild;
+ if (!node.nextSibling || isEndComment(node.nextSibling))
+ return null;
+ return node.nextSibling;
+ },
+
+ nextSibling: function(node) {
+ if (isStartComment(node))
+ node = getMatchingEndComment(node);
+ if (node.nextSibling && isEndComment(node.nextSibling))
+ return null;
+ return node.nextSibling;
+ },
+
+ virtualNodeBindingValue: function(node) {
+ var regexMatch = isStartComment(node);
+ return regexMatch ? regexMatch[1] : null;
+ },
+
+ normaliseVirtualElementDomStructure: function(elementVerified) {
+ // Workaround for https://github.com/SteveSanderson/knockout/issues/155
+ // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
+ // that are direct descendants of <ul> into the preceding <li>)
+ if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
+ return;
+
+ // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
+ // must be intended to appear *after* that child, so move them there.
+ var childNode = elementVerified.firstChild;
+ if (childNode) {
+ do {
+ if (childNode.nodeType === 1) {
+ var unbalancedTags = getUnbalancedChildTags(childNode);
+ if (unbalancedTags) {
+ // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
+ var nodeToInsertBefore = childNode.nextSibling;
+ for (var i = 0; i < unbalancedTags.length; i++) {
+ if (nodeToInsertBefore)
+ elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
+ else
+ elementVerified.appendChild(unbalancedTags[i]);
+ }
+ }
+ }
+ } while (childNode = childNode.nextSibling);
+ }
+ }
+ };
+})();
+ko.exportSymbol('virtualElements', ko.virtualElements);
+ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
+ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
+//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified
+ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
+//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
+ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
+ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
+(function() {
+ var defaultBindingAttributeName = "data-bind";
+
+ ko.bindingProvider = function() {
+ this.bindingCache = {};
+ };
+
+ ko.utils.extend(ko.bindingProvider.prototype, {
+ 'nodeHasBindings': function(node) {
+ switch (node.nodeType) {
+ case 1: return node.getAttribute(defaultBindingAttributeName) != null; // Element
+ case 8: return ko.virtualElements.virtualNodeBindingValue(node) != null; // Comment node
+ default: return false;
+ }
+ },
+
+ 'getBindings': function(node, bindingContext) {
+ var bindingsString = this['getBindingsString'](node, bindingContext);
+ return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
+ },
+
+ // The following function is only used internally by this default provider.
+ // It's not part of the interface definition for a general binding provider.
+ 'getBindingsString': function(node, bindingContext) {
+ switch (node.nodeType) {
+ case 1: return node.getAttribute(defaultBindingAttributeName); // Element
+ case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
+ default: return null;
+ }
+ },
+
+ // The following function is only used internally by this default provider.
+ // It's not part of the interface definition for a general binding provider.
+ 'parseBindingsString': function(bindingsString, bindingContext, node) {
+ try {
+ var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache);
+ return bindingFunction(bindingContext, node);
+ } catch (ex) {
+ throw new Error("Unable to parse bindings.\nMessage: " + ex + ";\nBindings value: " + bindingsString);
+ }
+ }
+ });
+
+ ko.bindingProvider['instance'] = new ko.bindingProvider();
+
+ function createBindingsStringEvaluatorViaCache(bindingsString, cache) {
+ var cacheKey = bindingsString;
+ return cache[cacheKey]
+ || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString));
+ }
+
+ function createBindingsStringEvaluator(bindingsString) {
+ // Build the source for a function that evaluates "expression"
+ // For each scope variable, add an extra level of "with" nesting
+ // Example result: with(sc1) { with(sc0) { return (expression) } }
+ var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString),
+ functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
+ return new Function("$context", "$element", functionBody);
+ }
+})();
+
+ko.exportSymbol('bindingProvider', ko.bindingProvider);
+(function () {
+ ko.bindingHandlers = {};
+
+ ko.bindingContext = function(dataItem, parentBindingContext, dataItemAlias) {
+ if (parentBindingContext) {
+ ko.utils.extend(this, parentBindingContext); // Inherit $root and any custom properties
+ this['$parentContext'] = parentBindingContext;
+ this['$parent'] = parentBindingContext['$data'];
+ this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
+ this['$parents'].unshift(this['$parent']);
+ } else {
+ this['$parents'] = [];
+ this['$root'] = dataItem;
+ // Export 'ko' in the binding context so it will be available in bindings and templates
+ // even if 'ko' isn't exported as a global, such as when using an AMD loader.
+ // See https://github.com/SteveSanderson/knockout/issues/490
+ this['ko'] = ko;
+ }
+ this['$data'] = dataItem;
+ if (dataItemAlias)
+ this[dataItemAlias] = dataItem;
+ }
+ ko.bindingContext.prototype['createChildContext'] = function (dataItem, dataItemAlias) {
+ return new ko.bindingContext(dataItem, this, dataItemAlias);
+ };
+ ko.bindingContext.prototype['extend'] = function(properties) {
+ var clone = ko.utils.extend(new ko.bindingContext(), this);
+ return ko.utils.extend(clone, properties);
+ };
+
+ function validateThatBindingIsAllowedForVirtualElements(bindingName) {
+ var validator = ko.virtualElements.allowedBindings[bindingName];
+ if (!validator)
+ throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
+ }
+
+ function applyBindingsToDescendantsInternal (viewModel, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
+ var currentChild, nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
+ while (currentChild = nextInQueue) {
+ // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
+ nextInQueue = ko.virtualElements.nextSibling(currentChild);
+ applyBindingsToNodeAndDescendantsInternal(viewModel, currentChild, bindingContextsMayDifferFromDomParentElement);
+ }
+ }
+
+ function applyBindingsToNodeAndDescendantsInternal (viewModel, nodeVerified, bindingContextMayDifferFromDomParentElement) {
+ var shouldBindDescendants = true;
+
+ // Perf optimisation: Apply bindings only if...
+ // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
+ // Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
+ // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
+ var isElement = (nodeVerified.nodeType === 1);
+ if (isElement) // Workaround IE <= 8 HTML parsing weirdness
+ ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
+
+ var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement) // Case (1)
+ || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
+ if (shouldApplyBindings)
+ shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, viewModel, bindingContextMayDifferFromDomParentElement).shouldBindDescendants;
+
+ if (shouldBindDescendants) {
+ // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
+ // * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
+ // hence bindingContextsMayDifferFromDomParentElement is false
+ // * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
+ // skip over any number of intermediate virtual elements, any of which might define a custom binding context,
+ // hence bindingContextsMayDifferFromDomParentElement is true
+ applyBindingsToDescendantsInternal(viewModel, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
+ }
+ }
+
+ function applyBindingsToNodeInternal (node, bindings, viewModelOrBindingContext, bindingContextMayDifferFromDomParentElement) {
+ // Need to be sure that inits are only run once, and updates never run until all the inits have been run
+ var initPhase = 0; // 0 = before all inits, 1 = during inits, 2 = after all inits
+
+ // Each time the dependentObservable is evaluated (after data changes),
+ // the binding attribute is reparsed so that it can pick out the correct
+ // model properties in the context of the changed data.
+ // DOM event callbacks need to be able to access this changed data,
+ // so we need a single parsedBindings variable (shared by all callbacks
+ // associated with this node's bindings) that all the closures can access.
+ var parsedBindings;
+ function makeValueAccessor(bindingKey) {
+ return function () { return parsedBindings[bindingKey] }
+ }
+ function parsedBindingsAccessor() {
+ return parsedBindings;
+ }
+
+ var bindingHandlerThatControlsDescendantBindings;
+ ko.dependentObservable(
+ function () {
+ // Ensure we have a nonnull binding context to work with
+ var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
+ ? viewModelOrBindingContext
+ : new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
+ var viewModel = bindingContextInstance['$data'];
+
+ // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
+ // we can easily recover it just by scanning up the node's ancestors in the DOM
+ // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
+ if (bindingContextMayDifferFromDomParentElement)
+ ko.storedBindingContextForNode(node, bindingContextInstance);
+
+ // Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
+ var evaluatedBindings = (typeof bindings == "function") ? bindings(bindingContextInstance, node) : bindings;
+ parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);
+
+ if (parsedBindings) {
+ // First run all the inits, so bindings can register for notification on changes
+ if (initPhase === 0) {
+ initPhase = 1;
+ for (var bindingKey in parsedBindings) {
+ var binding = ko.bindingHandlers[bindingKey];
+ if (binding && node.nodeType === 8)
+ validateThatBindingIsAllowedForVirtualElements(bindingKey);
+
+ if (binding && typeof binding["init"] == "function") {
+ var handlerInitFn = binding["init"];
+ var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
+
+ // If this binding handler claims to control descendant bindings, make a note of this
+ if (initResult && initResult['controlsDescendantBindings']) {
+ if (bindingHandlerThatControlsDescendantBindings !== undefined)
+ throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
+ bindingHandlerThatControlsDescendantBindings = bindingKey;
+ }
+ }
+ }
+ initPhase = 2;
+ }
+
+ // ... then run all the updates, which might trigger changes even on the first evaluation
+ if (initPhase === 2) {
+ for (var bindingKey in parsedBindings) {
+ var binding = ko.bindingHandlers[bindingKey];
+ if (binding && typeof binding["update"] == "function") {
+ var handlerUpdateFn = binding["update"];
+ handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
+ }
+ }
+ }
+ }
+ },
+ null,
+ { disposeWhenNodeIsRemoved : node }
+ );
+
+ return {
+ shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
+ };
+ };
+
+ var storedBindingContextDomDataKey = "__ko_bindingContext__";
+ ko.storedBindingContextForNode = function (node, bindingContext) {
+ if (arguments.length == 2)
+ ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
+ else
+ return ko.utils.domData.get(node, storedBindingContextDomDataKey);
+ }
+
+ ko.applyBindingsToNode = function (node, bindings, viewModel) {
+ if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
+ ko.virtualElements.normaliseVirtualElementDomStructure(node);
+ return applyBindingsToNodeInternal(node, bindings, viewModel, true);
+ };
+
+ ko.applyBindingsToDescendants = function(viewModel, rootNode) {
+ if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
+ applyBindingsToDescendantsInternal(viewModel, rootNode, true);
+ };
+
+ ko.applyBindings = function (viewModel, rootNode) {
+ if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
+ throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
+ rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
+
+ applyBindingsToNodeAndDescendantsInternal(viewModel, rootNode, true);
+ };
+
+ // Retrieving binding context from arbitrary nodes
+ ko.contextFor = function(node) {
+ // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
+ switch (node.nodeType) {
+ case 1:
+ case 8:
+ var context = ko.storedBindingContextForNode(node);
+ if (context) return context;
+ if (node.parentNode) return ko.contextFor(node.parentNode);
+ break;
+ }
+ return undefined;
+ };
+ ko.dataFor = function(node) {
+ var context = ko.contextFor(node);
+ return context ? context['$data'] : undefined;
+ };
+
+ ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
+ ko.exportSymbol('applyBindings', ko.applyBindings);
+ ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
+ ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
+ ko.exportSymbol('contextFor', ko.contextFor);
+ ko.exportSymbol('dataFor', ko.dataFor);
+})();
+var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
+ko.bindingHandlers['attr'] = {
+ 'update': function(element, valueAccessor, allBindingsAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor()) || {};
+ for (var attrName in value) {
+ if (typeof attrName == "string") {
+ var attrValue = ko.utils.unwrapObservable(value[attrName]);
+
+ // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
+ // when someProp is a "no value"-like value (strictly null, false, or undefined)
+ // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
+ var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
+ if (toRemove)
+ element.removeAttribute(attrName);
+
+ // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
+ // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
+ // but instead of figuring out the mode, we'll just set the attribute through the Javascript
+ // property for IE <= 8.
+ if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
+ attrName = attrHtmlToJavascriptMap[attrName];
+ if (toRemove)
+ element.removeAttribute(attrName);
+ else
+ element[attrName] = attrValue;
+ } else if (!toRemove) {
+ element.setAttribute(attrName, attrValue.toString());
+ }
+
+ // Treat "name" specially - although you can think of it as an attribute, it also needs
+ // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
+ // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
+ // entirely, and there's no strong reason to allow for such casing in HTML.
+ if (attrName === "name") {
+ ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
+ }
+ }
+ }
+ }
+};
+ko.bindingHandlers['checked'] = {
+ 'init': function (element, valueAccessor, allBindingsAccessor) {
+ var updateHandler = function() {
+ var valueToWrite;
+ if (element.type == "checkbox") {
+ valueToWrite = element.checked;
+ } else if ((element.type == "radio") && (element.checked)) {
+ valueToWrite = element.value;
+ } else {
+ return; // "checked" binding only responds to checkboxes and selected radio buttons
+ }
+
+ var modelValue = valueAccessor(), unwrappedValue = ko.utils.unwrapObservable(modelValue);
+ if ((element.type == "checkbox") && (unwrappedValue instanceof Array)) {
+ // For checkboxes bound to an array, we add/remove the checkbox value to that array
+ // This works for both observable and non-observable arrays
+ var existingEntryIndex = ko.utils.arrayIndexOf(unwrappedValue, element.value);
+ if (element.checked && (existingEntryIndex < 0))
+ modelValue.push(element.value);
+ else if ((!element.checked) && (existingEntryIndex >= 0))
+ modelValue.splice(existingEntryIndex, 1);
+ } else {
+ ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true);
+ }
+ };
+ ko.utils.registerEventHandler(element, "click", updateHandler);
+
+ // IE 6 won't allow radio buttons to be selected unless they have a name
+ if ((element.type == "radio") && !element.name)
+ ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
+ },
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+
+ if (element.type == "checkbox") {
+ if (value instanceof Array) {
+ // When bound to an array, the checkbox being checked represents its value being present in that array
+ element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
+ } else {
+ // When bound to anything other value (not an array), the checkbox being checked represents the value being trueish
+ element.checked = value;
+ }
+ } else if (element.type == "radio") {
+ element.checked = (element.value == value);
+ }
+ }
+};
+var classesWrittenByBindingKey = '__ko__cssValue';
+ko.bindingHandlers['css'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ if (typeof value == "object") {
+ for (var className in value) {
+ var shouldHaveClass = ko.utils.unwrapObservable(value[className]);
+ ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
+ }
+ } else {
+ value = String(value || ''); // Make sure we don't try to store or set a non-string value
+ ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
+ element[classesWrittenByBindingKey] = value;
+ ko.utils.toggleDomNodeCssClass(element, value, true);
+ }
+ }
+};
+ko.bindingHandlers['enable'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ if (value && element.disabled)
+ element.removeAttribute("disabled");
+ else if ((!value) && (!element.disabled))
+ element.disabled = true;
+ }
+};
+
+ko.bindingHandlers['disable'] = {
+ 'update': function (element, valueAccessor) {
+ ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
+ }
+};
+// For certain common events (currently just 'click'), allow a simplified data-binding syntax
+// e.g. click:handler instead of the usual full-length event:{click:handler}
+function makeEventHandlerShortcut(eventName) {
+ ko.bindingHandlers[eventName] = {
+ 'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
+ var newValueAccessor = function () {
+ var result = {};
+ result[eventName] = valueAccessor();
+ return result;
+ };
+ return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
+ }
+ }
+}
+
+ko.bindingHandlers['event'] = {
+ 'init' : function (element, valueAccessor, allBindingsAccessor, viewModel) {
+ var eventsToHandle = valueAccessor() || {};
+ for(var eventNameOutsideClosure in eventsToHandle) {
+ (function() {
+ var eventName = eventNameOutsideClosure; // Separate variable to be captured by event handler closure
+ if (typeof eventName == "string") {
+ ko.utils.registerEventHandler(element, eventName, function (event) {
+ var handlerReturnValue;
+ var handlerFunction = valueAccessor()[eventName];
+ if (!handlerFunction)
+ return;
+ var allBindings = allBindingsAccessor();
+
+ try {
+ // Take all the event args, and prefix with the viewmodel
+ var argsForHandler = ko.utils.makeArray(arguments);
+ argsForHandler.unshift(viewModel);
+ handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
+ } finally {
+ if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
+ if (event.preventDefault)
+ event.preventDefault();
+ else
+ event.returnValue = false;
+ }
+ }
+
+ var bubble = allBindings[eventName + 'Bubble'] !== false;
+ if (!bubble) {
+ event.cancelBubble = true;
+ if (event.stopPropagation)
+ event.stopPropagation();
+ }
+ });
+ }
+ })();
+ }
+ }
+};
+// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
+// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
+ko.bindingHandlers['foreach'] = {
+ makeTemplateValueAccessor: function(valueAccessor) {
+ return function() {
+ var modelValue = valueAccessor(),
+ unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here
+
+ // If unwrappedValue is the array, pass in the wrapped value on its own
+ // The value will be unwrapped and tracked within the template binding
+ // (See https://github.com/SteveSanderson/knockout/issues/523)
+ if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
+ return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
+
+ // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
+ ko.utils.unwrapObservable(modelValue);
+ return {
+ 'foreach': unwrappedValue['data'],
+ 'as': unwrappedValue['as'],
+ 'includeDestroyed': unwrappedValue['includeDestroyed'],
+ 'afterAdd': unwrappedValue['afterAdd'],
+ 'beforeRemove': unwrappedValue['beforeRemove'],
+ 'afterRender': unwrappedValue['afterRender'],
+ 'beforeMove': unwrappedValue['beforeMove'],
+ 'afterMove': unwrappedValue['afterMove'],
+ 'templateEngine': ko.nativeTemplateEngine.instance
+ };
+ };
+ },
+ 'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+ return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
+ },
+ 'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+ return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
+ }
+};
+ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
+ko.virtualElements.allowedBindings['foreach'] = true;
+var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
+ko.bindingHandlers['hasfocus'] = {
+ 'init': function(element, valueAccessor, allBindingsAccessor) {
+ var handleElementFocusChange = function(isFocused) {
+ // Where possible, ignore which event was raised and determine focus state using activeElement,
+ // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
+ // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
+ // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
+ // from calling 'blur()' on the element when it loses focus.
+ // Discussion at https://github.com/SteveSanderson/knockout/pull/352
+ element[hasfocusUpdatingProperty] = true;
+ var ownerDoc = element.ownerDocument;
+ if ("activeElement" in ownerDoc) {
+ isFocused = (ownerDoc.activeElement === element);
+ }
+ var modelValue = valueAccessor();
+ ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'hasfocus', isFocused, true);
+ element[hasfocusUpdatingProperty] = false;
+ };
+ var handleElementFocusIn = handleElementFocusChange.bind(null, true);
+ var handleElementFocusOut = handleElementFocusChange.bind(null, false);
+
+ ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
+ ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
+ ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
+ ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
+ },
+ 'update': function(element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ if (!element[hasfocusUpdatingProperty]) {
+ value ? element.focus() : element.blur();
+ ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
+ }
+ }
+};
+ko.bindingHandlers['html'] = {
+ 'init': function() {
+ // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function (element, valueAccessor) {
+ // setHtml will unwrap the value if needed
+ ko.utils.setHtml(element, valueAccessor());
+ }
+};
+var withIfDomDataKey = '__ko_withIfBindingData';
+// Makes a binding like with or if
+function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
+ ko.bindingHandlers[bindingKey] = {
+ 'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+ ko.utils.domData.set(element, withIfDomDataKey, {});
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+ var withIfData = ko.utils.domData.get(element, withIfDomDataKey),
+ dataValue = ko.utils.unwrapObservable(valueAccessor()),
+ shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
+ isFirstRender = !withIfData.savedNodes,
+ needsRefresh = isFirstRender || isWith || (shouldDisplay !== withIfData.didDisplayOnLastUpdate);
+
+ if (needsRefresh) {
+ if (isFirstRender) {
+ withIfData.savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
+ }
+
+ if (shouldDisplay) {
+ if (!isFirstRender) {
+ ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(withIfData.savedNodes));
+ }
+ ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
+ } else {
+ ko.virtualElements.emptyNode(element);
+ }
+
+ withIfData.didDisplayOnLastUpdate = shouldDisplay;
+ }
+ }
+ };
+ ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
+ ko.virtualElements.allowedBindings[bindingKey] = true;
+}
+
+// Construct the actual binding handlers
+makeWithIfBinding('if');
+makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
+makeWithIfBinding('with', true /* isWith */, false /* isNot */,
+ function(bindingContext, dataValue) {
+ return bindingContext['createChildContext'](dataValue);
+ }
+);
+function ensureDropdownSelectionIsConsistentWithModelValue(element, modelValue, preferModelValue) {
+ if (preferModelValue) {
+ if (modelValue !== ko.selectExtensions.readValue(element))
+ ko.selectExtensions.writeValue(element, modelValue);
+ }
+
+ // No matter which direction we're syncing in, we want the end result to be equality between dropdown value and model value.
+ // If they aren't equal, either we prefer the dropdown value, or the model value couldn't be represented, so either way,
+ // change the model value to match the dropdown.
+ if (modelValue !== ko.selectExtensions.readValue(element))
+ ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
+};
+
+ko.bindingHandlers['options'] = {
+ 'update': function (element, valueAccessor, allBindingsAccessor) {
+ if (ko.utils.tagNameLower(element) !== "select")
+ throw new Error("options binding applies only to SELECT elements");
+
+ var selectWasPreviouslyEmpty = element.length == 0;
+ var previousSelectedValues = ko.utils.arrayMap(ko.utils.arrayFilter(element.childNodes, function (node) {
+ return node.tagName && (ko.utils.tagNameLower(node) === "option") && node.selected;
+ }), function (node) {
+ return ko.selectExtensions.readValue(node) || node.innerText || node.textContent;
+ });
+ var previousScrollTop = element.scrollTop;
+
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ var selectedValue = element.value;
+
+ // Remove all existing <option>s.
+ // Need to use .remove() rather than .removeChild() for <option>s otherwise IE behaves oddly (https://github.com/SteveSanderson/knockout/issues/134)
+ while (element.length > 0) {
+ ko.cleanNode(element.options[0]);
+ element.remove(0);
+ }
+
+ if (value) {
+ var allBindings = allBindingsAccessor(),
+ includeDestroyed = allBindings['optionsIncludeDestroyed'];
+
+ if (typeof value.length != "number")
+ value = [value];
+ if (allBindings['optionsCaption']) {
+ var option = document.createElement("option");
+ ko.utils.setHtml(option, allBindings['optionsCaption']);
+ ko.selectExtensions.writeValue(option, undefined);
+ element.appendChild(option);
+ }
+
+ for (var i = 0, j = value.length; i < j; i++) {
+ // Skip destroyed items
+ var arrayEntry = value[i];
+ if (arrayEntry && arrayEntry['_destroy'] && !includeDestroyed)
+ continue;
+
+ var option = document.createElement("option");
+
+ function applyToObject(object, predicate, defaultValue) {
+ var predicateType = typeof predicate;
+ if (predicateType == "function") // Given a function; run it against the data value
+ return predicate(object);
+ else if (predicateType == "string") // Given a string; treat it as a property name on the data value
+ return object[predicate];
+ else // Given no optionsText arg; use the data value itself
+ return defaultValue;
+ }
+
+ // Apply a value to the option element
+ var optionValue = applyToObject(arrayEntry, allBindings['optionsValue'], arrayEntry);
+ ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
+
+ // Apply some text to the option element
+ var optionText = applyToObject(arrayEntry, allBindings['optionsText'], optionValue);
+ ko.utils.setTextContent(option, optionText);
+
+ element.appendChild(option);
+ }
+
+ // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
+ // That's why we first added them without selection. Now it's time to set the selection.
+ var newOptions = element.getElementsByTagName("option");
+ var countSelectionsRetained = 0;
+ for (var i = 0, j = newOptions.length; i < j; i++) {
+ if (ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[i])) >= 0) {
+ ko.utils.setOptionNodeSelectionState(newOptions[i], true);
+ countSelectionsRetained++;
+ }
+ }
+
+ element.scrollTop = previousScrollTop;
+
+ if (selectWasPreviouslyEmpty && ('value' in allBindings)) {
+ // Ensure consistency between model value and selected option.
+ // If the dropdown is being populated for the first time here (or was otherwise previously empty),
+ // the dropdown selection state is meaningless, so we preserve the model value.
+ ensureDropdownSelectionIsConsistentWithModelValue(element, ko.utils.peekObservable(allBindings['value']), /* preferModelValue */ true);
+ }
+
+ // Workaround for IE9 bug
+ ko.utils.ensureSelectElementIsRenderedCorrectly(element);
+ }
+ }
+};
+ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.optionValueDomData__';
+ko.bindingHandlers['selectedOptions'] = {
+ 'init': function (element, valueAccessor, allBindingsAccessor) {
+ ko.utils.registerEventHandler(element, "change", function () {
+ var value = valueAccessor(), valueToWrite = [];
+ ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
+ if (node.selected)
+ valueToWrite.push(ko.selectExtensions.readValue(node));
+ });
+ ko.expressionRewriting.writeValueToProperty(value, allBindingsAccessor, 'value', valueToWrite);
+ });
+ },
+ 'update': function (element, valueAccessor) {
+ if (ko.utils.tagNameLower(element) != "select")
+ throw new Error("values binding applies only to SELECT elements");
+
+ var newValue = ko.utils.unwrapObservable(valueAccessor());
+ if (newValue && typeof newValue.length == "number") {
+ ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
+ var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
+ ko.utils.setOptionNodeSelectionState(node, isSelected);
+ });
+ }
+ }
+};
+ko.bindingHandlers['style'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor() || {});
+ for (var styleName in value) {
+ if (typeof styleName == "string") {
+ var styleValue = ko.utils.unwrapObservable(value[styleName]);
+ element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
+ }
+ }
+ }
+};
+ko.bindingHandlers['submit'] = {
+ 'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
+ if (typeof valueAccessor() != "function")
+ throw new Error("The value for a submit binding must be a function");
+ ko.utils.registerEventHandler(element, "submit", function (event) {
+ var handlerReturnValue;
+ var value = valueAccessor();
+ try { handlerReturnValue = value.call(viewModel, element); }
+ finally {
+ if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
+ if (event.preventDefault)
+ event.preventDefault();
+ else
+ event.returnValue = false;
+ }
+ }
+ });
+ }
+};
+ko.bindingHandlers['text'] = {
+ 'update': function (element, valueAccessor) {
+ ko.utils.setTextContent(element, valueAccessor());
+ }
+};
+ko.virtualElements.allowedBindings['text'] = true;
+ko.bindingHandlers['uniqueName'] = {
+ 'init': function (element, valueAccessor) {
+ if (valueAccessor()) {
+ var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
+ ko.utils.setElementName(element, name);
+ }
+ }
+};
+ko.bindingHandlers['uniqueName'].currentIndex = 0;
+ko.bindingHandlers['value'] = {
+ 'init': function (element, valueAccessor, allBindingsAccessor) {
+ // Always catch "change" event; possibly other events too if asked
+ var eventsToCatch = ["change"];
+ var requestedEventsToCatch = allBindingsAccessor()["valueUpdate"];
+ var propertyChangedFired = false;
+ if (requestedEventsToCatch) {
+ if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
+ requestedEventsToCatch = [requestedEventsToCatch];
+ ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
+ eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
+ }
+
+ var valueUpdateHandler = function() {
+ propertyChangedFired = false;
+ var modelValue = valueAccessor();
+ var elementValue = ko.selectExtensions.readValue(element);
+ ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'value', elementValue);
+ }
+
+ // Workaround for https://github.com/SteveSanderson/knockout/issues/122
+ // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
+ var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
+ && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
+ if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
+ ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
+ ko.utils.registerEventHandler(element, "blur", function() {
+ if (propertyChangedFired) {
+ valueUpdateHandler();
+ }
+ });
+ }
+
+ ko.utils.arrayForEach(eventsToCatch, function(eventName) {
+ // The syntax "after<eventname>" means "run the handler asynchronously after the event"
+ // This is useful, for example, to catch "keydown" events after the browser has updated the control
+ // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
+ var handler = valueUpdateHandler;
+ if (ko.utils.stringStartsWith(eventName, "after")) {
+ handler = function() { setTimeout(valueUpdateHandler, 0) };
+ eventName = eventName.substring("after".length);
+ }
+ ko.utils.registerEventHandler(element, eventName, handler);
+ });
+ },
+ 'update': function (element, valueAccessor) {
+ var valueIsSelectOption = ko.utils.tagNameLower(element) === "select";
+ var newValue = ko.utils.unwrapObservable(valueAccessor());
+ var elementValue = ko.selectExtensions.readValue(element);
+ var valueHasChanged = (newValue != elementValue);
+
+ // JavaScript's 0 == "" behavious is unfortunate here as it prevents writing 0 to an empty text box (loose equality suggests the values are the same).
+ // We don't want to do a strict equality comparison as that is more confusing for developers in certain cases, so we specifically special case 0 != "" here.
+ if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0"))
+ valueHasChanged = true;
+
+ if (valueHasChanged) {
+ var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue); };
+ applyValueAction();
+
+ // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
+ // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
+ // to apply the value as well.
+ var alsoApplyAsynchronously = valueIsSelectOption;
+ if (alsoApplyAsynchronously)
+ setTimeout(applyValueAction, 0);
+ }
+
+ // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
+ // because you're not allowed to have a model value that disagrees with a visible UI selection.
+ if (valueIsSelectOption && (element.length > 0))
+ ensureDropdownSelectionIsConsistentWithModelValue(element, newValue, /* preferModelValue */ false);
+ }
+};
+ko.bindingHandlers['visible'] = {
+ 'update': function (element, valueAccessor) {
+ var value = ko.utils.unwrapObservable(valueAccessor());
+ var isCurrentlyVisible = !(element.style.display == "none");
+ if (value && !isCurrentlyVisible)
+ element.style.display = "";
+ else if ((!value) && isCurrentlyVisible)
+ element.style.display = "none";
+ }
+};
+// 'click' is just a shorthand for the usual full-length event:{click:handler}
+makeEventHandlerShortcut('click');
+// If you want to make a custom template engine,
+//
+// [1] Inherit from this class (like ko.nativeTemplateEngine does)
+// [2] Override 'renderTemplateSource', supplying a function with this signature:
+//
+// function (templateSource, bindingContext, options) {
+// // - templateSource.text() is the text of the template you should render
+// // - bindingContext.$data is the data you should pass into the template
+// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
+// // and bindingContext.$root available in the template too
+// // - options gives you access to any other properties set on "data-bind: { template: options }"
+// //
+// // Return value: an array of DOM nodes
+// }
+//
+// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
+//
+// function (script) {
+// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
+// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
+// }
+//
+// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
+// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
+// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
+
+ko.templateEngine = function () { };
+
+ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
+ throw new Error("Override renderTemplateSource");
+};
+
+ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
+ throw new Error("Override createJavaScriptEvaluatorBlock");
+};
+
+ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
+ // Named template
+ if (typeof template == "string") {
+ templateDocument = templateDocument || document;
+ var elem = templateDocument.getElementById(template);
+ if (!elem)
+ throw new Error("Cannot find template with ID " + template);
+ return new ko.templateSources.domElement(elem);
+ } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
+ // Anonymous template
+ return new ko.templateSources.anonymousTemplate(template);
+ } else
+ throw new Error("Unknown template type: " + template);
+};
+
+ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
+ var templateSource = this['makeTemplateSource'](template, templateDocument);
+ return this['renderTemplateSource'](templateSource, bindingContext, options);
+};
+
+ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
+ // Skip rewriting if requested
+ if (this['allowTemplateRewriting'] === false)
+ return true;
+ return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
+};
+
+ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
+ var templateSource = this['makeTemplateSource'](template, templateDocument);
+ var rewritten = rewriterCallback(templateSource['text']());
+ templateSource['text'](rewritten);
+ templateSource['data']("isRewritten", true);
+};
+
+ko.exportSymbol('templateEngine', ko.templateEngine);
+
+ko.templateRewriting = (function () {
+ var memoizeDataBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9\-]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/gi;
+ var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
+
+ function validateDataBindValuesForRewriting(keyValueArray) {
+ var allValidators = ko.expressionRewriting.bindingRewriteValidators;
+ for (var i = 0; i < keyValueArray.length; i++) {
+ var key = keyValueArray[i]['key'];
+ if (allValidators.hasOwnProperty(key)) {
+ var validator = allValidators[key];
+
+ if (typeof validator === "function") {
+ var possibleErrorMessage = validator(keyValueArray[i]['value']);
+ if (possibleErrorMessage)
+ throw new Error(possibleErrorMessage);
+ } else if (!validator) {
+ throw new Error("This template engine does not support the '" + key + "' binding within its templates");
+ }
+ }
+ }
+ }
+
+ function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, templateEngine) {
+ var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
+ validateDataBindValuesForRewriting(dataBindKeyValueArray);
+ var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray);
+
+ // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
+ // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
+ // extra indirection.
+ var applyBindingsToNextSiblingScript =
+ "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()})";
+ return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
+ }
+
+ return {
+ ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
+ if (!templateEngine['isTemplateRewritten'](template, templateDocument))
+ templateEngine['rewriteTemplate'](template, function (htmlString) {
+ return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
+ }, templateDocument);
+ },
+
+ memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
+ return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
+ return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[6], /* tagToRetain: */ arguments[1], templateEngine);
+ }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
+ return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", templateEngine);
+ });
+ },
+
+ applyMemoizedBindingsToNextSibling: function (bindings) {
+ return ko.memoization.memoize(function (domNode, bindingContext) {
+ if (domNode.nextSibling)
+ ko.applyBindingsToNode(domNode.nextSibling, bindings, bindingContext);
+ });
+ }
+ }
+})();
+
+
+// Exported only because it has to be referenced by string lookup from within rewritten template
+ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
+(function() {
+ // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
+ // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
+ //
+ // Two are provided by default:
+ // 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
+ // 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
+ // without reading/writing the actual element text content, since it will be overwritten
+ // with the rendered template output.
+ // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
+ // Template sources need to have the following functions:
+ // text() - returns the template text from your storage location
+ // text(value) - writes the supplied template text to your storage location
+ // data(key) - reads values stored using data(key, value) - see below
+ // data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
+ //
+ // Optionally, template sources can also have the following functions:
+ // nodes() - returns a DOM element containing the nodes of this template, where available
+ // nodes(value) - writes the given DOM element to your storage location
+ // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
+ // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
+ //
+ // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
+ // using and overriding "makeTemplateSource" to return an instance of your custom template source.
+
+ ko.templateSources = {};
+
+ // ---- ko.templateSources.domElement -----
+
+ ko.templateSources.domElement = function(element) {
+ this.domElement = element;
+ }
+
+ ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
+ var tagNameLower = ko.utils.tagNameLower(this.domElement),
+ elemContentsProperty = tagNameLower === "script" ? "text"
+ : tagNameLower === "textarea" ? "value"
+ : "innerHTML";
+
+ if (arguments.length == 0) {
+ return this.domElement[elemContentsProperty];
+ } else {
+ var valueToWrite = arguments[0];
+ if (elemContentsProperty === "innerHTML")
+ ko.utils.setHtml(this.domElement, valueToWrite);
+ else
+ this.domElement[elemContentsProperty] = valueToWrite;
+ }
+ };
+
+ ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
+ if (arguments.length === 1) {
+ return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
+ } else {
+ ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
+ }
+ };
+
+ // ---- ko.templateSources.anonymousTemplate -----
+ // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
+ // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
+ // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
+
+ var anonymousTemplatesDomDataKey = "__ko_anon_template__";
+ ko.templateSources.anonymousTemplate = function(element) {
+ this.domElement = element;
+ }
+ ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
+ ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
+ if (arguments.length == 0) {
+ var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
+ if (templateData.textData === undefined && templateData.containerData)
+ templateData.textData = templateData.containerData.innerHTML;
+ return templateData.textData;
+ } else {
+ var valueToWrite = arguments[0];
+ ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {textData: valueToWrite});
+ }
+ };
+ ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
+ if (arguments.length == 0) {
+ var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
+ return templateData.containerData;
+ } else {
+ var valueToWrite = arguments[0];
+ ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {containerData: valueToWrite});
+ }
+ };
+
+ ko.exportSymbol('templateSources', ko.templateSources);
+ ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
+ ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
+})();
+(function () {
+ var _templateEngine;
+ ko.setTemplateEngine = function (templateEngine) {
+ if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
+ throw new Error("templateEngine must inherit from ko.templateEngine");
+ _templateEngine = templateEngine;
+ }
+
+ function invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, action) {
+ var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
+ while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
+ nextInQueue = ko.virtualElements.nextSibling(node);
+ if (node.nodeType === 1 || node.nodeType === 8)
+ action(node);
+ }
+ }
+
+ function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
+ // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
+ // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
+ // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
+ // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
+ // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
+
+ if (continuousNodeArray.length) {
+ var firstNode = continuousNodeArray[0], lastNode = continuousNodeArray[continuousNodeArray.length - 1];
+
+ // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
+ // whereas a regular applyBindings won't introduce new memoized nodes
+ invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
+ ko.applyBindings(bindingContext, node);
+ });
+ invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
+ ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
+ });
+ }
+ }
+
+ function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
+ return nodeOrNodeArray.nodeType ? nodeOrNodeArray
+ : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
+ : null;
+ }
+
+ function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
+ options = options || {};
+ var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
+ var templateDocument = firstTargetNode && firstTargetNode.ownerDocument;
+ var templateEngineToUse = (options['templateEngine'] || _templateEngine);
+ ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
+ var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
+
+ // Loosely check result is an array of DOM nodes
+ if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
+ throw new Error("Template engine must return an array of DOM nodes");
+
+ var haveAddedNodesToParent = false;
+ switch (renderMode) {
+ case "replaceChildren":
+ ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
+ haveAddedNodesToParent = true;
+ break;
+ case "replaceNode":
+ ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
+ haveAddedNodesToParent = true;
+ break;
+ case "ignoreTargetNode": break;
+ default:
+ throw new Error("Unknown renderMode: " + renderMode);
+ }
+
+ if (haveAddedNodesToParent) {
+ activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
+ if (options['afterRender'])
+ ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
+ }
+
+ return renderedNodesArray;
+ }
+
+ ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
+ options = options || {};
+ if ((options['templateEngine'] || _templateEngine) == undefined)
+ throw new Error("Set a template engine before calling renderTemplate");
+ renderMode = renderMode || "replaceChildren";
+
+ if (targetNodeOrNodeArray) {
+ var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
+
+ var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
+ var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
+
+ return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
+ function () {
+ // Ensure we've got a proper binding context to work with
+ var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
+ ? dataOrBindingContext
+ : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));
+
+ // Support selecting template as a function of the data being rendered
+ var templateName = typeof(template) == 'function' ? template(bindingContext['$data'], bindingContext) : template;
+
+ var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
+ if (renderMode == "replaceNode") {
+ targetNodeOrNodeArray = renderedNodesArray;
+ firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
+ }
+ },
+ null,
+ { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
+ );
+ } else {
+ // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
+ return ko.memoization.memoize(function (domNode) {
+ ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
+ });
+ }
+ };
+
+ ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
+ // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
+ // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
+ var arrayItemContext;
+
+ // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
+ var executeTemplateForArrayItem = function (arrayValue, index) {
+ // Support selecting template as a function of the data being rendered
+ arrayItemContext = parentBindingContext['createChildContext'](ko.utils.unwrapObservable(arrayValue), options['as']);
+ arrayItemContext['$index'] = index;
+ var templateName = typeof(template) == 'function' ? template(arrayValue, arrayItemContext) : template;
+ return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
+ }
+
+ // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
+ var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
+ activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
+ if (options['afterRender'])
+ options['afterRender'](addedNodesArray, arrayValue);
+ };
+
+ return ko.dependentObservable(function () {
+ var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
+ if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
+ unwrappedArray = [unwrappedArray];
+
+ // Filter out any entries marked as destroyed
+ var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
+ return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
+ });
+
+ // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
+ // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
+ ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);
+
+ }, null, { disposeWhenNodeIsRemoved: targetNode });
+ };
+
+ var templateComputedDomDataKey = '__ko__templateComputedDomDataKey__';
+ function disposeOldComputedAndStoreNewOne(element, newComputed) {
+ var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
+ if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
+ oldComputed.dispose();
+ ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
+ }
+
+ ko.bindingHandlers['template'] = {
+ 'init': function(element, valueAccessor) {
+ // Support anonymous templates
+ var bindingValue = ko.utils.unwrapObservable(valueAccessor());
+ if ((typeof bindingValue != "string") && (!bindingValue['name']) && (element.nodeType == 1 || element.nodeType == 8)) {
+ // It's an anonymous template - store the element contents, then clear the element
+ var templateNodes = element.nodeType == 1 ? element.childNodes : ko.virtualElements.childNodes(element),
+ container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
+ new ko.templateSources.anonymousTemplate(element)['nodes'](container);
+ }
+ return { 'controlsDescendantBindings': true };
+ },
+ 'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+ var templateName = ko.utils.unwrapObservable(valueAccessor()),
+ options = {},
+ shouldDisplay = true,
+ dataValue,
+ templateComputed = null;
+
+ if (typeof templateName != "string") {
+ options = templateName;
+ templateName = options['name'];
+
+ // Support "if"/"ifnot" conditions
+ if ('if' in options)
+ shouldDisplay = ko.utils.unwrapObservable(options['if']);
+ if (shouldDisplay && 'ifnot' in options)
+ shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
+
+ dataValue = ko.utils.unwrapObservable(options['data']);
+ }
+
+ if ('foreach' in options) {
+ // Render once for each data point (treating data set as empty if shouldDisplay==false)
+ var dataArray = (shouldDisplay && options['foreach']) || [];
+ templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
+ } else if (!shouldDisplay) {
+ ko.virtualElements.emptyNode(element);
+ } else {
+ // Render once for this single data point (or use the viewModel if no data was provided)
+ var innerBindingContext = ('data' in options) ?
+ bindingContext['createChildContext'](dataValue, options['as']) : // Given an explitit 'data' value, we create a child binding context for it
+ bindingContext; // Given no explicit 'data' value, we retain the same binding context
+ templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
+ }
+
+ // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
+ disposeOldComputedAndStoreNewOne(element, templateComputed);
+ }
+ };
+
+ // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
+ ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
+ var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
+
+ if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
+ return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
+
+ if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
+ return null; // Named templates can be rewritten, so return "no error"
+ return "This template engine does not support anonymous templates nested within its templates";
+ };
+
+ ko.virtualElements.allowedBindings['template'] = true;
+})();
+
+ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
+ko.exportSymbol('renderTemplate', ko.renderTemplate);
+
+ko.utils.compareArrays = (function () {
+ var statusNotInOld = 'added', statusNotInNew = 'deleted';
+
+ // Simple calculation based on Levenshtein distance.
+ function compareArrays(oldArray, newArray, dontLimitMoves) {
+ oldArray = oldArray || [];
+ newArray = newArray || [];
+
+ if (oldArray.length <= newArray.length)
+ return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, dontLimitMoves);
+ else
+ return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, dontLimitMoves);
+ }
+
+ function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, dontLimitMoves) {
+ var myMin = Math.min,
+ myMax = Math.max,
+ editDistanceMatrix = [],
+ smlIndex, smlIndexMax = smlArray.length,
+ bigIndex, bigIndexMax = bigArray.length,
+ compareRange = (bigIndexMax - smlIndexMax) || 1,
+ maxDistance = smlIndexMax + bigIndexMax + 1,
+ thisRow, lastRow,
+ bigIndexMaxForRow, bigIndexMinForRow;
+
+ for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
+ lastRow = thisRow;
+ editDistanceMatrix.push(thisRow = []);
+ bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
+ bigIndexMinForRow = myMax(0, smlIndex - 1);
+ for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
+ if (!bigIndex)
+ thisRow[bigIndex] = smlIndex + 1;
+ else if (!smlIndex) // Top row - transform empty array into new array via additions
+ thisRow[bigIndex] = bigIndex + 1;
+ else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
+ thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit)
+ else {
+ var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion)
+ var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition)
+ thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
+ }
+ }
+ }
+
+ var editScript = [], meMinusOne, notInSml = [], notInBig = [];
+ for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
+ meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
+ if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
+ notInSml.push(editScript[editScript.length] = { // added
+ 'status': statusNotInSml,
+ 'value': bigArray[--bigIndex],
+ 'index': bigIndex });
+ } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
+ notInBig.push(editScript[editScript.length] = { // deleted
+ 'status': statusNotInBig,
+ 'value': smlArray[--smlIndex],
+ 'index': smlIndex });
+ } else {
+ editScript.push({
+ 'status': "retained",
+ 'value': bigArray[--bigIndex] });
+ --smlIndex;
+ }
+ }
+
+ if (notInSml.length && notInBig.length) {
+ // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
+ // smlIndexMax keeps the time complexity of this algorithm linear.
+ var limitFailedCompares = smlIndexMax * 10, failedCompares,
+ a, d, notInSmlItem, notInBigItem;
+ // Go through the items that have been added and deleted and try to find matches between them.
+ for (failedCompares = a = 0; (dontLimitMoves || failedCompares < limitFailedCompares) && (notInSmlItem = notInSml[a]); a++) {
+ for (d = 0; notInBigItem = notInBig[d]; d++) {
+ if (notInSmlItem['value'] === notInBigItem['value']) {
+ notInSmlItem['moved'] = notInBigItem['index'];
+ notInBigItem['moved'] = notInSmlItem['index'];
+ notInBig.splice(d,1); // This item is marked as moved; so remove it from notInBig list
+ failedCompares = d = 0; // Reset failed compares count because we're checking for consecutive failures
+ break;
+ }
+ }
+ failedCompares += d;
+ }
+ }
+ return editScript.reverse();
+ }
+
+ return compareArrays;
+})();
+
+ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
+
+(function () {
+ // Objective:
+ // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
+ // map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
+ // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
+ // so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
+ // previously mapped - retain those nodes, and just insert/delete other ones
+
+ // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
+ // You can use this, for example, to activate bindings on those nodes.
+
+ function fixUpNodesToBeMovedOrRemoved(contiguousNodeArray) {
+ // Before moving, deleting, or replacing a set of nodes that were previously outputted by the "map" function, we have to reconcile
+ // them against what is in the DOM right now. It may be that some of the nodes have already been removed from the document,
+ // or that new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
+ // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
+ // So, this function translates the old "map" output array into its best guess of what set of current DOM nodes should be removed.
+ //
+ // Rules:
+ // [A] Any leading nodes that aren't in the document any more should be ignored
+ // These most likely correspond to memoization nodes that were already removed during binding
+ // See https://github.com/SteveSanderson/knockout/pull/440
+ // [B] We want to output a contiguous series of nodes that are still in the document. So, ignore any nodes that
+ // have already been removed, and include any nodes that have been inserted among the previous collection
+
+ // Rule [A]
+ while (contiguousNodeArray.length && !ko.utils.domNodeIsAttachedToDocument(contiguousNodeArray[0]))
+ contiguousNodeArray.splice(0, 1);
+
+ // Rule [B]
+ if (contiguousNodeArray.length > 1) {
+ // Build up the actual new contiguous node set
+ var current = contiguousNodeArray[0], last = contiguousNodeArray[contiguousNodeArray.length - 1], newContiguousSet = [current];
+ while (current !== last) {
+ current = current.nextSibling;
+ if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
+ return;
+ newContiguousSet.push(current);
+ }
+
+ // ... then mutate the input array to match this.
+ // (The following line replaces the contents of contiguousNodeArray with newContiguousSet)
+ Array.prototype.splice.apply(contiguousNodeArray, [0, contiguousNodeArray.length].concat(newContiguousSet));
+ }
+ return contiguousNodeArray;
+ }
+
+ function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
+ // Map this array value inside a dependentObservable so we re-map when any dependency changes
+ var mappedNodes = [];
+ var dependentObservable = ko.dependentObservable(function() {
+ var newMappedNodes = mapping(valueToMap, index) || [];
+
+ // On subsequent evaluations, just replace the previously-inserted DOM nodes
+ if (mappedNodes.length > 0) {
+ ko.utils.replaceDomNodes(fixUpNodesToBeMovedOrRemoved(mappedNodes), newMappedNodes);
+ if (callbackAfterAddingNodes)
+ ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
+ }
+
+ // Replace the contents of the mappedNodes array, thereby updating the record
+ // of which nodes would be deleted if valueToMap was itself later removed
+ mappedNodes.splice(0, mappedNodes.length);
+ ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
+ }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return (mappedNodes.length == 0) || !ko.utils.domNodeIsAttachedToDocument(mappedNodes[0]) } });
+ return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
+ }
+
+ var lastMappingResultDomDataKey = "setDomNodeChildrenFromArrayMapping_lastMappingResult";
+
+ ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
+ // Compare the provided array against the previous one
+ array = array || [];
+ options = options || {};
+ var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
+ var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
+ var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
+ var editScript = ko.utils.compareArrays(lastArray, array);
+
+ // Build the new mapping result
+ var newMappingResult = [];
+ var lastMappingResultIndex = 0;
+ var newMappingResultIndex = 0;
+
+ var nodesToDelete = [];
+ var itemsToProcess = [];
+ var itemsForBeforeRemoveCallbacks = [];
+ var itemsForMoveCallbacks = [];
+ var itemsForAfterAddCallbacks = [];
+ var mapData;
+
+ function itemMovedOrRetained(editScriptIndex, oldPosition) {
+ mapData = lastMappingResult[oldPosition];
+ if (newMappingResultIndex !== oldPosition)
+ itemsForMoveCallbacks[editScriptIndex] = mapData;
+ // Since updating the index might change the nodes, do so before calling fixUpNodesToBeMovedOrRemoved
+ mapData.indexObservable(newMappingResultIndex++);
+ fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes);
+ newMappingResult.push(mapData);
+ itemsToProcess.push(mapData);
+ }
+
+ function callCallback(callback, items) {
+ if (callback) {
+ for (var i = 0, n = items.length; i < n; i++) {
+ if (items[i]) {
+ ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
+ callback(node, i, items[i].arrayEntry);
+ });
+ }
+ }
+ }
+ }
+
+ for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
+ movedIndex = editScriptItem['moved'];
+ switch (editScriptItem['status']) {
+ case "deleted":
+ if (movedIndex === undefined) {
+ mapData = lastMappingResult[lastMappingResultIndex];
+
+ // Stop tracking changes to the mapping for these nodes
+ if (mapData.dependentObservable)
+ mapData.dependentObservable.dispose();
+
+ // Queue these nodes for later removal
+ nodesToDelete.push.apply(nodesToDelete, fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes));
+ if (options['beforeRemove']) {
+ itemsForBeforeRemoveCallbacks[i] = mapData;
+ itemsToProcess.push(mapData);
+ }
+ }
+ lastMappingResultIndex++;
+ break;
+
+ case "retained":
+ itemMovedOrRetained(i, lastMappingResultIndex++);
+ break;
+
+ case "added":
+ if (movedIndex !== undefined) {
+ itemMovedOrRetained(i, movedIndex);
+ } else {
+ mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
+ newMappingResult.push(mapData);
+ itemsToProcess.push(mapData);
+ if (!isFirstExecution)
+ itemsForAfterAddCallbacks[i] = mapData;
+ }
+ break;
+ }
+ }
+
+ // Call beforeMove first before any changes have been made to the DOM
+ callCallback(options['beforeMove'], itemsForMoveCallbacks);
+
+ // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
+ ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
+
+ // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
+ for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
+ // Get nodes for newly added items
+ if (!mapData.mappedNodes)
+ ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
+
+ // Put nodes in the right place if they aren't there already
+ for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
+ if (node !== nextNode)
+ ko.virtualElements.insertAfter(domNode, node, lastNode);
+ }
+
+ // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
+ if (!mapData.initialized && callbackAfterAddingNodes) {
+ callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
+ mapData.initialized = true;
+ }
+ }
+
+ // If there's a beforeRemove callback, call it after reordering.
+ // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
+ // some sort of animation, which is why we first reorder the nodes that will be removed. If the
+ // callback instead removes the nodes right away, it would be more efficient to skip reordering them.
+ // Perhaps we'll make that change in the future if this scenario becomes more common.
+ callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
+
+ // Finally call afterMove and afterAdd callbacks
+ callCallback(options['afterMove'], itemsForMoveCallbacks);
+ callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
+
+ // Store a copy of the array items we just considered so we can difference it next time
+ ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
+ }
+})();
+
+ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
+ko.nativeTemplateEngine = function () {
+ this['allowTemplateRewriting'] = false;
+}
+
+ko.nativeTemplateEngine.prototype = new ko.templateEngine();
+ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
+ var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
+ templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
+ templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
+
+ if (templateNodes) {
+ return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
+ } else {
+ var templateText = templateSource['text']();
+ return ko.utils.parseHtmlFragment(templateText);
+ }
+};
+
+ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
+ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
+
+ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
+(function() {
+ ko.jqueryTmplTemplateEngine = function () {
+ // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
+ // doesn't expose a version number, so we have to infer it.
+ // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
+ // which KO internally refers to as version "2", so older versions are no longer detected.
+ var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
+ if ((typeof(jQuery) == "undefined") || !(jQuery['tmpl']))
+ return 0;
+ // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
+ try {
+ if (jQuery['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
+ // Since 1.0.0pre, custom tags should append markup to an array called "__"
+ return 2; // Final version of jquery.tmpl
+ }
+ } catch(ex) { /* Apparently not the version we were looking for */ }
+
+ return 1; // Any older version that we don't support
+ })();
+
+ function ensureHasReferencedJQueryTemplates() {
+ if (jQueryTmplVersion < 2)
+ throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
+ }
+
+ function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
+ return jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
+ }
+
+ this['renderTemplateSource'] = function(templateSource, bindingContext, options) {
+ options = options || {};
+ ensureHasReferencedJQueryTemplates();
+
+ // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
+ var precompiled = templateSource['data']('precompiled');
+ if (!precompiled) {
+ var templateText = templateSource['text']() || "";
+ // Wrap in "with($whatever.koBindingContext) { ... }"
+ templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
+
+ precompiled = jQuery['template'](null, templateText);
+ templateSource['data']('precompiled', precompiled);
+ }
+
+ var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
+ var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
+
+ var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
+ resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
+
+ jQuery['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
+ return resultNodes;
+ };
+
+ this['createJavaScriptEvaluatorBlock'] = function(script) {
+ return "{{ko_code ((function() { return " + script + " })()) }}";
+ };
+
+ this['addTemplate'] = function(templateName, templateMarkup) {
+ document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "</script>");
+ };
+
+ if (jQueryTmplVersion > 0) {
+ jQuery['tmpl']['tag']['ko_code'] = {
+ open: "__.push($1 || '');"
+ };
+ jQuery['tmpl']['tag']['ko_with'] = {
+ open: "with($1) {",
+ close: "} "
+ };
+ }
+ };
+
+ ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
+
+ // Use this one by default *only if jquery.tmpl is referenced*
+ var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
+ if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
+ ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
+
+ ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
+})();
+});
+})(window,document,navigator,window["jQuery"]);
+})();
+++ /dev/null
-// Knockout JavaScript library v2.2.0rc
-// (c) Steven Sanderson - http://knockoutjs.com/
-// License: MIT (http://www.opensource.org/licenses/mit-license.php)
-
-(function(){
-var DEBUG=true;
-(function(window,document,navigator,jQuery,undefined){
-!function(factory) {
- // Support three module loading scenarios
- if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
- // [1] CommonJS/Node.js
- var target = module['exports'] || exports; // module.exports is for Node.js
- factory(target);
- } else if (typeof define === 'function' && define['amd']) {
- // [2] AMD anonymous module
- define(['exports'], factory);
- } else {
- // [3] No module loader (plain <script> tag) - put directly in global namespace
- factory(window['ko'] = {});
- }
-}(function(koExports){
-// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
-// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
-var ko = typeof koExports !== 'undefined' ? koExports : {};
-// Google Closure Compiler helpers (used only to make the minified file smaller)
-ko.exportSymbol = function(koPath, object) {
- var tokens = koPath.split(".");
-
- // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
- // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
- var target = ko;
-
- for (var i = 0; i < tokens.length - 1; i++)
- target = target[tokens[i]];
- target[tokens[tokens.length - 1]] = object;
-};
-ko.exportProperty = function(owner, publicName, object) {
- owner[publicName] = object;
-};
-ko.version = "2.2.0rc";
-
-ko.exportSymbol('version', ko.version);
-ko.utils = new (function () {
- var stringTrimRegex = /^(\s|\u00A0)+|(\s|\u00A0)+$/g;
-
- // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
- var knownEvents = {}, knownEventTypesByEventName = {};
- var keyEventTypeName = /Firefox\/2/i.test(navigator.userAgent) ? 'KeyboardEvent' : 'UIEvents';
- knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
- knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
- for (var eventType in knownEvents) {
- var knownEventsForType = knownEvents[eventType];
- if (knownEventsForType.length) {
- for (var i = 0, j = knownEventsForType.length; i < j; i++)
- knownEventTypesByEventName[knownEventsForType[i]] = eventType;
- }
- }
- var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
-
- // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
- var ieVersion = (function() {
- var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
-
- // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
- while (
- div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
- iElems[0]
- );
- return version > 4 ? version : undefined;
- }());
- var isIe6 = ieVersion === 6,
- isIe7 = ieVersion === 7;
-
- function isClickOnCheckableElement(element, eventType) {
- if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
- if (eventType.toLowerCase() != "click") return false;
- var inputType = element.type;
- return (inputType == "checkbox") || (inputType == "radio");
- }
-
- return {
- fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
-
- arrayForEach: function (array, action) {
- for (var i = 0, j = array.length; i < j; i++)
- action(array[i]);
- },
-
- arrayIndexOf: function (array, item) {
- if (typeof Array.prototype.indexOf == "function")
- return Array.prototype.indexOf.call(array, item);
- for (var i = 0, j = array.length; i < j; i++)
- if (array[i] === item)
- return i;
- return -1;
- },
-
- arrayFirst: function (array, predicate, predicateOwner) {
- for (var i = 0, j = array.length; i < j; i++)
- if (predicate.call(predicateOwner, array[i]))
- return array[i];
- return null;
- },
-
- arrayRemoveItem: function (array, itemToRemove) {
- var index = ko.utils.arrayIndexOf(array, itemToRemove);
- if (index >= 0)
- array.splice(index, 1);
- },
-
- arrayGetDistinctValues: function (array) {
- array = array || [];
- var result = [];
- for (var i = 0, j = array.length; i < j; i++) {
- if (ko.utils.arrayIndexOf(result, array[i]) < 0)
- result.push(array[i]);
- }
- return result;
- },
-
- arrayMap: function (array, mapping) {
- array = array || [];
- var result = [];
- for (var i = 0, j = array.length; i < j; i++)
- result.push(mapping(array[i]));
- return result;
- },
-
- arrayFilter: function (array, predicate) {
- array = array || [];
- var result = [];
- for (var i = 0, j = array.length; i < j; i++)
- if (predicate(array[i]))
- result.push(array[i]);
- return result;
- },
-
- arrayPushAll: function (array, valuesToPush) {
- if (valuesToPush instanceof Array)
- array.push.apply(array, valuesToPush);
- else
- for (var i = 0, j = valuesToPush.length; i < j; i++)
- array.push(valuesToPush[i]);
- return array;
- },
-
- extend: function (target, source) {
- if (source) {
- for(var prop in source) {
- if(source.hasOwnProperty(prop)) {
- target[prop] = source[prop];
- }
- }
- }
- return target;
- },
-
- emptyDomNode: function (domNode) {
- while (domNode.firstChild) {
- ko.removeNode(domNode.firstChild);
- }
- },
-
- moveCleanedNodesToContainerElement: function(nodes) {
- // Ensure it's a real array, as we're about to reparent the nodes and
- // we don't want the underlying collection to change while we're doing that.
- var nodesArray = ko.utils.makeArray(nodes);
-
- var container = document.createElement('div');
- for (var i = 0, j = nodesArray.length; i < j; i++) {
- container.appendChild(ko.cleanNode(nodesArray[i]));
- }
- return container;
- },
-
- cloneNodes: function (nodesArray, shouldCleanNodes) {
- for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
- var clonedNode = nodesArray[i].cloneNode(true);
- newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
- }
- return newNodesArray;
- },
-
- setDomNodeChildren: function (domNode, childNodes) {
- ko.utils.emptyDomNode(domNode);
- if (childNodes) {
- for (var i = 0, j = childNodes.length; i < j; i++)
- domNode.appendChild(childNodes[i]);
- }
- },
-
- replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
- var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
- if (nodesToReplaceArray.length > 0) {
- var insertionPoint = nodesToReplaceArray[0];
- var parent = insertionPoint.parentNode;
- for (var i = 0, j = newNodesArray.length; i < j; i++)
- parent.insertBefore(newNodesArray[i], insertionPoint);
- for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
- ko.removeNode(nodesToReplaceArray[i]);
- }
- }
- },
-
- setOptionNodeSelectionState: function (optionNode, isSelected) {
- // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
- if (ieVersion < 7)
- optionNode.setAttribute("selected", isSelected);
- else
- optionNode.selected = isSelected;
- },
-
- stringTrim: function (string) {
- return (string || "").replace(stringTrimRegex, "");
- },
-
- stringTokenize: function (string, delimiter) {
- var result = [];
- var tokens = (string || "").split(delimiter);
- for (var i = 0, j = tokens.length; i < j; i++) {
- var trimmed = ko.utils.stringTrim(tokens[i]);
- if (trimmed !== "")
- result.push(trimmed);
- }
- return result;
- },
-
- stringStartsWith: function (string, startsWith) {
- string = string || "";
- if (startsWith.length > string.length)
- return false;
- return string.substring(0, startsWith.length) === startsWith;
- },
-
- domNodeIsContainedBy: function (node, containedByNode) {
- if (containedByNode.compareDocumentPosition)
- return (containedByNode.compareDocumentPosition(node) & 16) == 16;
- while (node != null) {
- if (node == containedByNode)
- return true;
- node = node.parentNode;
- }
- return false;
- },
-
- domNodeIsAttachedToDocument: function (node) {
- return ko.utils.domNodeIsContainedBy(node, node.ownerDocument);
- },
-
- tagNameLower: function(element) {
- // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
- // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
- // we don't need to do the .toLowerCase() as it will always be lower case anyway.
- return element && element.tagName && element.tagName.toLowerCase();
- },
-
- registerEventHandler: function (element, eventType, handler) {
- var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
- if (!mustUseAttachEvent && typeof jQuery != "undefined") {
- if (isClickOnCheckableElement(element, eventType)) {
- // For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
- // it toggles the element checked state *after* the click event handlers run, whereas native
- // click events toggle the checked state *before* the event handler.
- // Fix this by intecepting the handler and applying the correct checkedness before it runs.
- var originalHandler = handler;
- handler = function(event, eventData) {
- var jQuerySuppliedCheckedState = this.checked;
- if (eventData)
- this.checked = eventData.checkedStateBeforeEvent !== true;
- originalHandler.call(this, event);
- this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
- };
- }
- jQuery(element)['bind'](eventType, handler);
- } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
- element.addEventListener(eventType, handler, false);
- else if (typeof element.attachEvent != "undefined")
- element.attachEvent("on" + eventType, function (event) {
- handler.call(element, event);
- });
- else
- throw new Error("Browser doesn't support addEventListener or attachEvent");
- },
-
- triggerEvent: function (element, eventType) {
- if (!(element && element.nodeType))
- throw new Error("element must be a DOM node when calling triggerEvent");
-
- if (typeof jQuery != "undefined") {
- var eventData = [];
- if (isClickOnCheckableElement(element, eventType)) {
- // Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
- eventData.push({ checkedStateBeforeEvent: element.checked });
- }
- jQuery(element)['trigger'](eventType, eventData);
- } else if (typeof document.createEvent == "function") {
- if (typeof element.dispatchEvent == "function") {
- var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
- var event = document.createEvent(eventCategory);
- event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
- element.dispatchEvent(event);
- }
- else
- throw new Error("The supplied element doesn't support dispatchEvent");
- } else if (typeof element.fireEvent != "undefined") {
- // Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
- // so to make it consistent, we'll do it manually here
- if (isClickOnCheckableElement(element, eventType))
- element.checked = element.checked !== true;
- element.fireEvent("on" + eventType);
- }
- else
- throw new Error("Browser doesn't support triggering events");
- },
-
- unwrapObservable: function (value) {
- return ko.isObservable(value) ? value() : value;
- },
-
- peekObservable: function (value) {
- return ko.isObservable(value) ? value.peek() : value;
- },
-
- toggleDomNodeCssClass: function (node, classNames, shouldHaveClass) {
- if (classNames) {
- var cssClassNameRegex = /[\w-]+/g,
- currentClassNames = node.className.match(cssClassNameRegex) || [];
- ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
- var indexOfClass = ko.utils.arrayIndexOf(currentClassNames, className);
- if (indexOfClass >= 0) {
- if (!shouldHaveClass)
- currentClassNames.splice(indexOfClass, 1);
- } else {
- if (shouldHaveClass)
- currentClassNames.push(className);
- }
- });
- node.className = currentClassNames.join(" ");
- }
- },
-
- setTextContent: function(element, textContent) {
- var value = ko.utils.unwrapObservable(textContent);
- if ((value === null) || (value === undefined))
- value = "";
-
- // We need there to be exactly one child: a text node.
- // If there are no children, more than one, or if it's not a text node,
- // we'll clear everything and create a single text node.
- var innerTextNode = ko.virtualElements.firstChild(element);
- if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
- ko.virtualElements.setDomNodeChildren(element, [document.createTextNode(value)]);
- } else {
- innerTextNode.data = value;
- }
-
- ko.utils.forceRefresh(element);
- },
-
- setElementName: function(element, name) {
- element.name = name;
-
- // Workaround IE 6/7 issue
- // - https://github.com/SteveSanderson/knockout/issues/197
- // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
- if (ieVersion <= 7) {
- try {
- element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
- }
- catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
- }
- },
-
- forceRefresh: function(node) {
- // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
- if (ieVersion >= 9) {
- // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
- var elem = node.nodeType == 1 ? node : node.parentNode;
- if (elem.style)
- elem.style.zoom = elem.style.zoom;
- }
- },
-
- ensureSelectElementIsRenderedCorrectly: function(selectElement) {
- // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
- // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
- if (ieVersion >= 9) {
- var originalWidth = selectElement.style.width;
- selectElement.style.width = 0;
- selectElement.style.width = originalWidth;
- }
- },
-
- range: function (min, max) {
- min = ko.utils.unwrapObservable(min);
- max = ko.utils.unwrapObservable(max);
- var result = [];
- for (var i = min; i <= max; i++)
- result.push(i);
- return result;
- },
-
- makeArray: function(arrayLikeObject) {
- var result = [];
- for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
- result.push(arrayLikeObject[i]);
- };
- return result;
- },
-
- isIe6 : isIe6,
- isIe7 : isIe7,
- ieVersion : ieVersion,
-
- getFormFields: function(form, fieldName) {
- var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
- var isMatchingField = (typeof fieldName == 'string')
- ? function(field) { return field.name === fieldName }
- : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
- var matches = [];
- for (var i = fields.length - 1; i >= 0; i--) {
- if (isMatchingField(fields[i]))
- matches.push(fields[i]);
- };
- return matches;
- },
-
- parseJson: function (jsonString) {
- if (typeof jsonString == "string") {
- jsonString = ko.utils.stringTrim(jsonString);
- if (jsonString) {
- if (window.JSON && window.JSON.parse) // Use native parsing where available
- return window.JSON.parse(jsonString);
- return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
- }
- }
- return null;
- },
-
- stringifyJson: function (data, replacer, space) { // replacer and space are optional
- if ((typeof JSON == "undefined") || (typeof JSON.stringify == "undefined"))
- throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
- return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
- },
-
- postJson: function (urlOrForm, data, options) {
- options = options || {};
- var params = options['params'] || {};
- var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
- var url = urlOrForm;
-
- // If we were given a form, use its 'action' URL and pick out any requested field values
- if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
- var originalForm = urlOrForm;
- url = originalForm.action;
- for (var i = includeFields.length - 1; i >= 0; i--) {
- var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
- for (var j = fields.length - 1; j >= 0; j--)
- params[fields[j].name] = fields[j].value;
- }
- }
-
- data = ko.utils.unwrapObservable(data);
- var form = document.createElement("form");
- form.style.display = "none";
- form.action = url;
- form.method = "post";
- for (var key in data) {
- var input = document.createElement("input");
- input.name = key;
- input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
- form.appendChild(input);
- }
- for (var key in params) {
- var input = document.createElement("input");
- input.name = key;
- input.value = params[key];
- form.appendChild(input);
- }
- document.body.appendChild(form);
- options['submitter'] ? options['submitter'](form) : form.submit();
- setTimeout(function () { form.parentNode.removeChild(form); }, 0);
- }
- }
-})();
-
-ko.exportSymbol('utils', ko.utils);
-ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
-ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
-ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
-ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
-ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
-ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
-ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
-ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
-ko.exportSymbol('utils.extend', ko.utils.extend);
-ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
-ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
-ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
-ko.exportSymbol('utils.postJson', ko.utils.postJson);
-ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
-ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
-ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
-ko.exportSymbol('utils.range', ko.utils.range);
-ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
-ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
-ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
-
-if (!Function.prototype['bind']) {
- // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
- // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
- Function.prototype['bind'] = function (object) {
- var originalFunction = this, args = Array.prototype.slice.call(arguments), object = args.shift();
- return function () {
- return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
- };
- };
-}
-
-ko.utils.domData = new (function () {
- var uniqueId = 0;
- var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
- var dataStore = {};
- return {
- get: function (node, key) {
- var allDataForNode = ko.utils.domData.getAll(node, false);
- return allDataForNode === undefined ? undefined : allDataForNode[key];
- },
- set: function (node, key, value) {
- if (value === undefined) {
- // Make sure we don't actually create a new domData key if we are actually deleting a value
- if (ko.utils.domData.getAll(node, false) === undefined)
- return;
- }
- var allDataForNode = ko.utils.domData.getAll(node, true);
- allDataForNode[key] = value;
- },
- getAll: function (node, createIfNotFound) {
- var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
- var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
- if (!hasExistingDataStore) {
- if (!createIfNotFound)
- return undefined;
- dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
- dataStore[dataStoreKey] = {};
- }
- return dataStore[dataStoreKey];
- },
- clear: function (node) {
- var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
- if (dataStoreKey) {
- delete dataStore[dataStoreKey];
- node[dataStoreKeyExpandoPropertyName] = null;
- return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
- }
- return false;
- }
- }
-})();
-
-ko.exportSymbol('utils.domData', ko.utils.domData);
-ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
-
-ko.utils.domNodeDisposal = new (function () {
- var domDataKey = "__ko_domNodeDisposal__" + (new Date).getTime();
- var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
- var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
-
- function getDisposeCallbacksCollection(node, createIfNotFound) {
- var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
- if ((allDisposeCallbacks === undefined) && createIfNotFound) {
- allDisposeCallbacks = [];
- ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
- }
- return allDisposeCallbacks;
- }
- function destroyCallbacksCollection(node) {
- ko.utils.domData.set(node, domDataKey, undefined);
- }
-
- function cleanSingleNode(node) {
- // Run all the dispose callbacks
- var callbacks = getDisposeCallbacksCollection(node, false);
- if (callbacks) {
- callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
- for (var i = 0; i < callbacks.length; i++)
- callbacks[i](node);
- }
-
- // Also erase the DOM data
- ko.utils.domData.clear(node);
-
- // Special support for jQuery here because it's so commonly used.
- // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
- // so notify it to tear down any resources associated with the node & descendants here.
- if ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
- jQuery['cleanData']([node]);
-
- // Also clear any immediate-child comment nodes, as these wouldn't have been found by
- // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
- if (cleanableNodeTypesWithDescendants[node.nodeType])
- cleanImmediateCommentTypeChildren(node);
- }
-
- function cleanImmediateCommentTypeChildren(nodeWithChildren) {
- var child, nextChild = nodeWithChildren.firstChild;
- while (child = nextChild) {
- nextChild = child.nextSibling;
- if (child.nodeType === 8)
- cleanSingleNode(child);
- }
- }
-
- return {
- addDisposeCallback : function(node, callback) {
- if (typeof callback != "function")
- throw new Error("Callback must be a function");
- getDisposeCallbacksCollection(node, true).push(callback);
- },
-
- removeDisposeCallback : function(node, callback) {
- var callbacksCollection = getDisposeCallbacksCollection(node, false);
- if (callbacksCollection) {
- ko.utils.arrayRemoveItem(callbacksCollection, callback);
- if (callbacksCollection.length == 0)
- destroyCallbacksCollection(node);
- }
- },
-
- cleanNode : function(node) {
- // First clean this node, where applicable
- if (cleanableNodeTypes[node.nodeType]) {
- cleanSingleNode(node);
-
- // ... then its descendants, where applicable
- if (cleanableNodeTypesWithDescendants[node.nodeType]) {
- // Clone the descendants list in case it changes during iteration
- var descendants = [];
- ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
- for (var i = 0, j = descendants.length; i < j; i++)
- cleanSingleNode(descendants[i]);
- }
- }
- return node;
- },
-
- removeNode : function(node) {
- ko.cleanNode(node);
- if (node.parentNode)
- node.parentNode.removeChild(node);
- }
- }
-})();
-ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
-ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
-ko.exportSymbol('cleanNode', ko.cleanNode);
-ko.exportSymbol('removeNode', ko.removeNode);
-ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
-ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
-ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
-(function () {
- var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
-
- function simpleHtmlParse(html) {
- // Based on jQuery's "clean" function, but only accounting for table-related elements.
- // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
-
- // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
- // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
- // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
- // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
-
- // Trim whitespace, otherwise indexOf won't work as expected
- var tags = ko.utils.stringTrim(html).toLowerCase(), div = document.createElement("div");
-
- // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
- var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
- !tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
- (!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
- /* anything else */ [0, "", ""];
-
- // Go to html and back, then peel off extra wrappers
- // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
- var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
- if (typeof window['innerShiv'] == "function") {
- div.appendChild(window['innerShiv'](markup));
- } else {
- div.innerHTML = markup;
- }
-
- // Move to the right depth
- while (wrap[0]--)
- div = div.lastChild;
-
- return ko.utils.makeArray(div.lastChild.childNodes);
- }
-
- function jQueryHtmlParse(html) {
- var elems = jQuery['clean']([html]);
-
- // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
- // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
- // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
- if (elems && elems[0]) {
- // Find the top-most parent element that's a direct child of a document fragment
- var elem = elems[0];
- while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
- elem = elem.parentNode;
- // ... then detach it
- if (elem.parentNode)
- elem.parentNode.removeChild(elem);
- }
-
- return elems;
- }
-
- ko.utils.parseHtmlFragment = function(html) {
- return typeof jQuery != 'undefined' ? jQueryHtmlParse(html) // As below, benefit from jQuery's optimisations where possible
- : simpleHtmlParse(html); // ... otherwise, this simple logic will do in most common cases.
- };
-
- ko.utils.setHtml = function(node, html) {
- ko.utils.emptyDomNode(node);
-
- // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
- html = ko.utils.unwrapObservable(html);
-
- if ((html !== null) && (html !== undefined)) {
- if (typeof html != 'string')
- html = html.toString();
-
- // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
- // for example <tr> elements which are not normally allowed to exist on their own.
- // If you've referenced jQuery we'll use that rather than duplicating its code.
- if (typeof jQuery != 'undefined') {
- jQuery(node)['html'](html);
- } else {
- // ... otherwise, use KO's own parsing logic.
- var parsedNodes = ko.utils.parseHtmlFragment(html);
- for (var i = 0; i < parsedNodes.length; i++)
- node.appendChild(parsedNodes[i]);
- }
- }
- };
-})();
-
-ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
-ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
-
-ko.memoization = (function () {
- var memos = {};
-
- function randomMax8HexChars() {
- return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
- }
- function generateRandomId() {
- return randomMax8HexChars() + randomMax8HexChars();
- }
- function findMemoNodes(rootNode, appendToArray) {
- if (!rootNode)
- return;
- if (rootNode.nodeType == 8) {
- var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
- if (memoId != null)
- appendToArray.push({ domNode: rootNode, memoId: memoId });
- } else if (rootNode.nodeType == 1) {
- for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
- findMemoNodes(childNodes[i], appendToArray);
- }
- }
-
- return {
- memoize: function (callback) {
- if (typeof callback != "function")
- throw new Error("You can only pass a function to ko.memoization.memoize()");
- var memoId = generateRandomId();
- memos[memoId] = callback;
- return "<!--[ko_memo:" + memoId + "]-->";
- },
-
- unmemoize: function (memoId, callbackParams) {
- var callback = memos[memoId];
- if (callback === undefined)
- throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
- try {
- callback.apply(null, callbackParams || []);
- return true;
- }
- finally { delete memos[memoId]; }
- },
-
- unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
- var memos = [];
- findMemoNodes(domNode, memos);
- for (var i = 0, j = memos.length; i < j; i++) {
- var node = memos[i].domNode;
- var combinedParams = [node];
- if (extraCallbackParamsArray)
- ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
- ko.memoization.unmemoize(memos[i].memoId, combinedParams);
- node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
- if (node.parentNode)
- node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
- }
- },
-
- parseMemoText: function (memoText) {
- var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
- return match ? match[1] : null;
- }
- };
-})();
-
-ko.exportSymbol('memoization', ko.memoization);
-ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
-ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
-ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
-ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
-ko.extenders = {
- 'throttle': function(target, timeout) {
- // Throttling means two things:
-
- // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
- // notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
- target['throttleEvaluation'] = timeout;
-
- // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
- // so the target cannot change value synchronously or faster than a certain rate
- var writeTimeoutInstance = null;
- return ko.dependentObservable({
- 'read': target,
- 'write': function(value) {
- clearTimeout(writeTimeoutInstance);
- writeTimeoutInstance = setTimeout(function() {
- target(value);
- }, timeout);
- }
- });
- },
-
- 'notify': function(target, notifyWhen) {
- target["equalityComparer"] = notifyWhen == "always"
- ? function() { return false } // Treat all values as not equal
- : ko.observable["fn"]["equalityComparer"];
- return target;
- }
-};
-
-function applyExtenders(requestedExtenders) {
- var target = this;
- if (requestedExtenders) {
- for (var key in requestedExtenders) {
- var extenderHandler = ko.extenders[key];
- if (typeof extenderHandler == 'function') {
- target = extenderHandler(target, requestedExtenders[key]);
- }
- }
- }
- return target;
-}
-
-ko.exportSymbol('extenders', ko.extenders);
-
-ko.subscription = function (target, callback, disposeCallback) {
- this.target = target;
- this.callback = callback;
- this.disposeCallback = disposeCallback;
- ko.exportProperty(this, 'dispose', this.dispose);
-};
-ko.subscription.prototype.dispose = function () {
- this.isDisposed = true;
- this.disposeCallback();
-};
-
-ko.subscribable = function () {
- this._subscriptions = {};
-
- ko.utils.extend(this, ko.subscribable['fn']);
- ko.exportProperty(this, 'subscribe', this.subscribe);
- ko.exportProperty(this, 'extend', this.extend);
- ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
-}
-
-var defaultEvent = "change";
-
-ko.subscribable['fn'] = {
- subscribe: function (callback, callbackTarget, event) {
- event = event || defaultEvent;
- var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
-
- var subscription = new ko.subscription(this, boundCallback, function () {
- ko.utils.arrayRemoveItem(this._subscriptions[event], subscription);
- }.bind(this));
-
- if (!this._subscriptions[event])
- this._subscriptions[event] = [];
- this._subscriptions[event].push(subscription);
- return subscription;
- },
-
- "notifySubscribers": function (valueToNotify, event) {
- event = event || defaultEvent;
- if (this._subscriptions[event]) {
- ko.dependencyDetection.ignore(function() {
- ko.utils.arrayForEach(this._subscriptions[event].slice(0), function (subscription) {
- // In case a subscription was disposed during the arrayForEach cycle, check
- // for isDisposed on each subscription before invoking its callback
- if (subscription && (subscription.isDisposed !== true))
- subscription.callback(valueToNotify);
- });
- }, this);
- }
- },
-
- getSubscriptionsCount: function () {
- var total = 0;
- for (var eventName in this._subscriptions) {
- if (this._subscriptions.hasOwnProperty(eventName))
- total += this._subscriptions[eventName].length;
- }
- return total;
- },
-
- extend: applyExtenders
-};
-
-
-ko.isSubscribable = function (instance) {
- return typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
-};
-
-ko.exportSymbol('subscribable', ko.subscribable);
-ko.exportSymbol('isSubscribable', ko.isSubscribable);
-
-ko.dependencyDetection = (function () {
- var _frames = [];
-
- return {
- begin: function (callback) {
- _frames.push({ callback: callback, distinctDependencies:[] });
- },
-
- end: function () {
- _frames.pop();
- },
-
- registerDependency: function (subscribable) {
- if (!ko.isSubscribable(subscribable))
- throw new Error("Only subscribable things can act as dependencies");
- if (_frames.length > 0) {
- var topFrame = _frames[_frames.length - 1];
- if (!topFrame || ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
- return;
- topFrame.distinctDependencies.push(subscribable);
- topFrame.callback(subscribable);
- }
- },
-
- ignore: function(callback, callbackTarget, callbackArgs) {
- try {
- _frames.push(null);
- return callback.apply(callbackTarget, callbackArgs || []);
- } finally {
- _frames.pop();
- }
- }
- };
-})();
-var primitiveTypes = { 'undefined':true, 'boolean':true, 'number':true, 'string':true };
-
-ko.observable = function (initialValue) {
- var _latestValue = initialValue;
-
- function observable() {
- if (arguments.length > 0) {
- // Write
-
- // Ignore writes if the value hasn't changed
- if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
- observable.valueWillMutate();
- _latestValue = arguments[0];
- if (DEBUG) observable._latestValue = _latestValue;
- observable.valueHasMutated();
- }
- return this; // Permits chained assignments
- }
- else {
- // Read
- ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
- return _latestValue;
- }
- }
- if (DEBUG) observable._latestValue = _latestValue;
- ko.subscribable.call(observable);
- observable.peek = function() { return _latestValue };
- observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
- observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
- ko.utils.extend(observable, ko.observable['fn']);
-
- ko.exportProperty(observable, 'peek', observable.peek);
- ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
- ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);
-
- return observable;
-}
-
-ko.observable['fn'] = {
- "equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
- var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
- return oldValueIsPrimitive ? (a === b) : false;
- }
-};
-
-var protoProperty = ko.observable.protoProperty = "__ko_proto__";
-ko.observable['fn'][protoProperty] = ko.observable;
-
-ko.hasPrototype = function(instance, prototype) {
- if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
- if (instance[protoProperty] === prototype) return true;
- return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
-};
-
-ko.isObservable = function (instance) {
- return ko.hasPrototype(instance, ko.observable);
-}
-ko.isWriteableObservable = function (instance) {
- // Observable
- if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
- return true;
- // Writeable dependent observable
- if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
- return true;
- // Anything else
- return false;
-}
-
-
-ko.exportSymbol('observable', ko.observable);
-ko.exportSymbol('isObservable', ko.isObservable);
-ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
-ko.observableArray = function (initialValues) {
- if (arguments.length == 0) {
- // Zero-parameter constructor initializes to empty array
- initialValues = [];
- }
- if ((initialValues !== null) && (initialValues !== undefined) && !('length' in initialValues))
- throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
-
- var result = ko.observable(initialValues);
- ko.utils.extend(result, ko.observableArray['fn']);
- return result;
-}
-
-ko.observableArray['fn'] = {
- 'remove': function (valueOrPredicate) {
- var underlyingArray = this.peek();
- var removedValues = [];
- var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
- for (var i = 0; i < underlyingArray.length; i++) {
- var value = underlyingArray[i];
- if (predicate(value)) {
- if (removedValues.length === 0) {
- this.valueWillMutate();
- }
- removedValues.push(value);
- underlyingArray.splice(i, 1);
- i--;
- }
- }
- if (removedValues.length) {
- this.valueHasMutated();
- }
- return removedValues;
- },
-
- 'removeAll': function (arrayOfValues) {
- // If you passed zero args, we remove everything
- if (arrayOfValues === undefined) {
- var underlyingArray = this.peek();
- var allValues = underlyingArray.slice(0);
- this.valueWillMutate();
- underlyingArray.splice(0, underlyingArray.length);
- this.valueHasMutated();
- return allValues;
- }
- // If you passed an arg, we interpret it as an array of entries to remove
- if (!arrayOfValues)
- return [];
- return this['remove'](function (value) {
- return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
- });
- },
-
- 'destroy': function (valueOrPredicate) {
- var underlyingArray = this.peek();
- var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
- this.valueWillMutate();
- for (var i = underlyingArray.length - 1; i >= 0; i--) {
- var value = underlyingArray[i];
- if (predicate(value))
- underlyingArray[i]["_destroy"] = true;
- }
- this.valueHasMutated();
- },
-
- 'destroyAll': function (arrayOfValues) {
- // If you passed zero args, we destroy everything
- if (arrayOfValues === undefined)
- return this['destroy'](function() { return true });
-
- // If you passed an arg, we interpret it as an array of entries to destroy
- if (!arrayOfValues)
- return [];
- return this['destroy'](function (value) {
- return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
- });
- },
-
- 'indexOf': function (item) {
- var underlyingArray = this();
- return ko.utils.arrayIndexOf(underlyingArray, item);
- },
-
- 'replace': function(oldItem, newItem) {
- var index = this['indexOf'](oldItem);
- if (index >= 0) {
- this.valueWillMutate();
- this.peek()[index] = newItem;
- this.valueHasMutated();
- }
- }
-}
-
-// Populate ko.observableArray.fn with read/write functions from native arrays
-// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
-// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
-ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
- ko.observableArray['fn'][methodName] = function () {
- // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
- // (for consistency with mutating regular observables)
- var underlyingArray = this.peek();
- this.valueWillMutate();
- var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
- this.valueHasMutated();
- return methodCallResult;
- };
-});
-
-// Populate ko.observableArray.fn with read-only functions from native arrays
-ko.utils.arrayForEach(["slice"], function (methodName) {
- ko.observableArray['fn'][methodName] = function () {
- var underlyingArray = this();
- return underlyingArray[methodName].apply(underlyingArray, arguments);
- };
-});
-
-ko.exportSymbol('observableArray', ko.observableArray);
-ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
- var _latestValue,
- _hasBeenEvaluated = false,
- _isBeingEvaluated = false,
- readFunction = evaluatorFunctionOrOptions;
-
- if (readFunction && typeof readFunction == "object") {
- // Single-parameter syntax - everything is on this "options" param
- options = readFunction;
- readFunction = options["read"];
- } else {
- // Multi-parameter syntax - construct the options according to the params passed
- options = options || {};
- if (!readFunction)
- readFunction = options["read"];
- }
- if (typeof readFunction != "function")
- throw new Error("Pass a function that returns the value of the ko.computed");
-
- function addSubscriptionToDependency(subscribable) {
- _subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync));
- }
-
- function disposeAllSubscriptionsToDependencies() {
- ko.utils.arrayForEach(_subscriptionsToDependencies, function (subscription) {
- subscription.dispose();
- });
- _subscriptionsToDependencies = [];
- }
-
- function evaluatePossiblyAsync() {
- var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
- if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
- clearTimeout(evaluationTimeoutInstance);
- evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
- } else
- evaluateImmediate();
- }
-
- function evaluateImmediate() {
- if (_isBeingEvaluated) {
- // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
- // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
- // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
- // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
- return;
- }
-
- // Don't dispose on first evaluation, because the "disposeWhen" callback might
- // e.g., dispose when the associated DOM element isn't in the doc, and it's not
- // going to be in the doc until *after* the first evaluation
- if (_hasBeenEvaluated && disposeWhen()) {
- dispose();
- return;
- }
-
- _isBeingEvaluated = true;
- try {
- // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
- // Then, during evaluation, we cross off any that are in fact still being used.
- var disposalCandidates = ko.utils.arrayMap(_subscriptionsToDependencies, function(item) {return item.target;});
-
- ko.dependencyDetection.begin(function(subscribable) {
- var inOld;
- if ((inOld = ko.utils.arrayIndexOf(disposalCandidates, subscribable)) >= 0)
- disposalCandidates[inOld] = undefined; // Don't want to dispose this subscription, as it's still being used
- else
- addSubscriptionToDependency(subscribable); // Brand new subscription - add it
- });
-
- var newValue = readFunction.call(evaluatorFunctionTarget);
-
- // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
- for (var i = disposalCandidates.length - 1; i >= 0; i--) {
- if (disposalCandidates[i])
- _subscriptionsToDependencies.splice(i, 1)[0].dispose();
- }
- _hasBeenEvaluated = true;
-
- dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
- _latestValue = newValue;
- if (DEBUG) dependentObservable._latestValue = _latestValue;
- } finally {
- ko.dependencyDetection.end();
- }
-
- dependentObservable["notifySubscribers"](_latestValue);
- _isBeingEvaluated = false;
- if (!_subscriptionsToDependencies.length)
- dispose();
- }
-
- function dependentObservable() {
- if (arguments.length > 0) {
- if (typeof writeFunction === "function") {
- // Writing a value
- writeFunction.apply(evaluatorFunctionTarget, arguments);
- } else {
- throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
- }
- return this; // Permits chained assignments
- } else {
- // Reading the value
- if (!_hasBeenEvaluated)
- evaluateImmediate();
- ko.dependencyDetection.registerDependency(dependentObservable);
- return _latestValue;
- }
- }
-
- function peek() {
- if (!_hasBeenEvaluated)
- evaluateImmediate();
- return _latestValue;
- }
-
- function isActive() {
- return !_hasBeenEvaluated || _subscriptionsToDependencies.length > 0;
- }
-
- // By here, "options" is always non-null
- var writeFunction = options["write"],
- disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
- disposeWhen = options["disposeWhen"] || options.disposeWhen || function() { return false; },
- dispose = disposeAllSubscriptionsToDependencies,
- _subscriptionsToDependencies = [],
- evaluationTimeoutInstance = null;
-
- if (!evaluatorFunctionTarget)
- evaluatorFunctionTarget = options["owner"];
-
- dependentObservable.peek = peek;
- dependentObservable.getDependenciesCount = function () { return _subscriptionsToDependencies.length; };
- dependentObservable.hasWriteFunction = typeof options["write"] === "function";
- dependentObservable.dispose = function () { dispose(); };
- dependentObservable.isActive = isActive;
-
- ko.subscribable.call(dependentObservable);
- ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);
-
- ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
- ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
- ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
- ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
-
- // Evaluate, unless deferEvaluation is true
- if (options['deferEvaluation'] !== true)
- evaluateImmediate();
-
- // Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values.
- // But skip if isActive is false (there will never be any dependencies to dispose).
- // (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
- // plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
- if (disposeWhenNodeIsRemoved && isActive()) {
- dispose = function() {
- ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, arguments.callee);
- disposeAllSubscriptionsToDependencies();
- };
- ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
- var existingDisposeWhenFunction = disposeWhen;
- disposeWhen = function () {
- return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || existingDisposeWhenFunction();
- }
- }
-
- return dependentObservable;
-};
-
-ko.isComputed = function(instance) {
- return ko.hasPrototype(instance, ko.dependentObservable);
-};
-
-var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
-ko.dependentObservable[protoProp] = ko.observable;
-
-ko.dependentObservable['fn'] = {};
-ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;
-
-ko.exportSymbol('dependentObservable', ko.dependentObservable);
-ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
-ko.exportSymbol('isComputed', ko.isComputed);
-
-(function() {
- var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
-
- ko.toJS = function(rootObject) {
- if (arguments.length == 0)
- throw new Error("When calling ko.toJS, pass the object you want to convert.");
-
- // We just unwrap everything at every level in the object graph
- return mapJsObjectGraph(rootObject, function(valueToMap) {
- // Loop because an observable's value might in turn be another observable wrapper
- for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
- valueToMap = valueToMap();
- return valueToMap;
- });
- };
-
- ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
- var plainJavaScriptObject = ko.toJS(rootObject);
- return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
- };
-
- function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
- visitedObjects = visitedObjects || new objectLookup();
-
- rootObject = mapInputCallback(rootObject);
- var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date));
- if (!canHaveProperties)
- return rootObject;
-
- var outputProperties = rootObject instanceof Array ? [] : {};
- visitedObjects.save(rootObject, outputProperties);
-
- visitPropertiesOrArrayEntries(rootObject, function(indexer) {
- var propertyValue = mapInputCallback(rootObject[indexer]);
-
- switch (typeof propertyValue) {
- case "boolean":
- case "number":
- case "string":
- case "function":
- outputProperties[indexer] = propertyValue;
- break;
- case "object":
- case "undefined":
- var previouslyMappedValue = visitedObjects.get(propertyValue);
- outputProperties[indexer] = (previouslyMappedValue !== undefined)
- ? previouslyMappedValue
- : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
- break;
- }
- });
-
- return outputProperties;
- }
-
- function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
- if (rootObject instanceof Array) {
- for (var i = 0; i < rootObject.length; i++)
- visitorCallback(i);
-
- // For arrays, also respect toJSON property for custom mappings (fixes #278)
- if (typeof rootObject['toJSON'] == 'function')
- visitorCallback('toJSON');
- } else {
- for (var propertyName in rootObject)
- visitorCallback(propertyName);
- }
- };
-
- function objectLookup() {
- var keys = [];
- var values = [];
- this.save = function(key, value) {
- var existingIndex = ko.utils.arrayIndexOf(keys, key);
- if (existingIndex >= 0)
- values[existingIndex] = value;
- else {
- keys.push(key);
- values.push(value);
- }
- };
- this.get = function(key) {
- var existingIndex = ko.utils.arrayIndexOf(keys, key);
- return (existingIndex >= 0) ? values[existingIndex] : undefined;
- };
- };
-})();
-
-ko.exportSymbol('toJS', ko.toJS);
-ko.exportSymbol('toJSON', ko.toJSON);
-(function () {
- var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
-
- // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
- // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
- // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
- ko.selectExtensions = {
- readValue : function(element) {
- switch (ko.utils.tagNameLower(element)) {
- case 'option':
- if (element[hasDomDataExpandoProperty] === true)
- return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
- return ko.utils.ieVersion <= 7
- ? (element.getAttributeNode('value').specified ? element.value : element.text)
- : element.value;
- case 'select':
- return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
- default:
- return element.value;
- }
- },
-
- writeValue: function(element, value) {
- switch (ko.utils.tagNameLower(element)) {
- case 'option':
- switch(typeof value) {
- case "string":
- ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
- if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
- delete element[hasDomDataExpandoProperty];
- }
- element.value = value;
- break;
- default:
- // Store arbitrary object using DomData
- ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
- element[hasDomDataExpandoProperty] = true;
-
- // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
- element.value = typeof value === "number" ? value : "";
- break;
- }
- break;
- case 'select':
- for (var i = element.options.length - 1; i >= 0; i--) {
- if (ko.selectExtensions.readValue(element.options[i]) == value) {
- element.selectedIndex = i;
- break;
- }
- }
- break;
- default:
- if ((value === null) || (value === undefined))
- value = "";
- element.value = value;
- break;
- }
- }
- };
-})();
-
-ko.exportSymbol('selectExtensions', ko.selectExtensions);
-ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
-ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
-ko.expressionRewriting = (function () {
- var restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
- var javaScriptReservedWords = ["true", "false"];
-
- // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
- // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
- var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
-
- function restoreTokens(string, tokens) {
- var prevValue = null;
- while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
- prevValue = string;
- string = string.replace(restoreCapturedTokensRegex, function (match, tokenIndex) {
- return tokens[tokenIndex];
- });
- }
- return string;
- }
-
- function getWriteableValue(expression) {
- if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
- return false;
- var match = expression.match(javaScriptAssignmentTarget);
- return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
- }
-
- function ensureQuoted(key) {
- var trimmedKey = ko.utils.stringTrim(key);
- switch (trimmedKey.length && trimmedKey.charAt(0)) {
- case "'":
- case '"':
- return key;
- default:
- return "'" + trimmedKey + "'";
- }
- }
-
- return {
- bindingRewriteValidators: [],
-
- parseObjectLiteral: function(objectLiteralString) {
- // A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
- // that is sufficient just to split an object literal string into a set of top-level key-value pairs
-
- var str = ko.utils.stringTrim(objectLiteralString);
- if (str.length < 3)
- return [];
- if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
- str = str.substring(1, str.length - 1);
-
- // Pull out any string literals and regex literals
- var tokens = [];
- var tokenStart = null, tokenEndChar;
- for (var position = 0; position < str.length; position++) {
- var c = str.charAt(position);
- if (tokenStart === null) {
- switch (c) {
- case '"':
- case "'":
- case "/":
- tokenStart = position;
- tokenEndChar = c;
- break;
- }
- } else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
- var token = str.substring(tokenStart, position + 1);
- tokens.push(token);
- var replacement = "@ko_token_" + (tokens.length - 1) + "@";
- str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
- position -= (token.length - replacement.length);
- tokenStart = null;
- }
- }
-
- // Next pull out balanced paren, brace, and bracket blocks
- tokenStart = null;
- tokenEndChar = null;
- var tokenDepth = 0, tokenStartChar = null;
- for (var position = 0; position < str.length; position++) {
- var c = str.charAt(position);
- if (tokenStart === null) {
- switch (c) {
- case "{": tokenStart = position; tokenStartChar = c;
- tokenEndChar = "}";
- break;
- case "(": tokenStart = position; tokenStartChar = c;
- tokenEndChar = ")";
- break;
- case "[": tokenStart = position; tokenStartChar = c;
- tokenEndChar = "]";
- break;
- }
- }
-
- if (c === tokenStartChar)
- tokenDepth++;
- else if (c === tokenEndChar) {
- tokenDepth--;
- if (tokenDepth === 0) {
- var token = str.substring(tokenStart, position + 1);
- tokens.push(token);
- var replacement = "@ko_token_" + (tokens.length - 1) + "@";
- str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
- position -= (token.length - replacement.length);
- tokenStart = null;
- }
- }
- }
-
- // Now we can safely split on commas to get the key/value pairs
- var result = [];
- var keyValuePairs = str.split(",");
- for (var i = 0, j = keyValuePairs.length; i < j; i++) {
- var pair = keyValuePairs[i];
- var colonPos = pair.indexOf(":");
- if ((colonPos > 0) && (colonPos < pair.length - 1)) {
- var key = pair.substring(0, colonPos);
- var value = pair.substring(colonPos + 1);
- result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
- } else {
- result.push({ 'unknown': restoreTokens(pair, tokens) });
- }
- }
- return result;
- },
-
- preProcessBindings: function (objectLiteralStringOrKeyValueArray) {
- var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
- ? ko.expressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
- : objectLiteralStringOrKeyValueArray;
- var resultStrings = [], propertyAccessorResultStrings = [];
-
- var keyValueEntry;
- for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
- if (resultStrings.length > 0)
- resultStrings.push(",");
-
- if (keyValueEntry['key']) {
- var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
- resultStrings.push(quotedKey);
- resultStrings.push(":");
- resultStrings.push(val);
-
- if (val = getWriteableValue(ko.utils.stringTrim(val))) {
- if (propertyAccessorResultStrings.length > 0)
- propertyAccessorResultStrings.push(", ");
- propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
- }
- } else if (keyValueEntry['unknown']) {
- resultStrings.push(keyValueEntry['unknown']);
- }
- }
-
- var combinedResult = resultStrings.join("");
- if (propertyAccessorResultStrings.length > 0) {
- var allPropertyAccessors = propertyAccessorResultStrings.join("");
- combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
- }
-
- return combinedResult;
- },
-
- keyValueArrayContainsKey: function(keyValueArray, key) {
- for (var i = 0; i < keyValueArray.length; i++)
- if (ko.utils.stringTrim(keyValueArray[i]['key']) == key)
- return true;
- return false;
- },
-
- // Internal, private KO utility for updating model properties from within bindings
- // property: If the property being updated is (or might be) an observable, pass it here
- // If it turns out to be a writable observable, it will be written to directly
- // allBindingsAccessor: All bindings in the current execution context.
- // This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
- // key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
- // value: The value to be written
- // checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if
- // it is !== existing value on that writable observable
- writeValueToProperty: function(property, allBindingsAccessor, key, value, checkIfDifferent) {
- if (!property || !ko.isWriteableObservable(property)) {
- var propWriters = allBindingsAccessor()['_ko_property_writers'];
- if (propWriters && propWriters[key])
- propWriters[key](value);
- } else if (!checkIfDifferent || property.peek() !== value) {
- property(value);
- }
- }
- };
-})();
-
-ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
-ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
-ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
-ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
-
-// For backward compatibility, define the following aliases. (Previously, these function names were misleading because
-// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
-ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
-ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);(function() {
- // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
- // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
- // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
- // of that virtual hierarchy
- //
- // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
- // without having to scatter special cases all over the binding and templating code.
-
- // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
- // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
- // So, use node.text where available, and node.nodeValue elsewhere
- var commentNodesHaveTextProperty = document.createComment("test").text === "<!--test-->";
-
- var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*-->$/ : /^\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*$/;
- var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
- var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
-
- function isStartComment(node) {
- return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
- }
-
- function isEndComment(node) {
- return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(endCommentRegex);
- }
-
- function getVirtualChildren(startComment, allowUnbalanced) {
- var currentNode = startComment;
- var depth = 1;
- var children = [];
- while (currentNode = currentNode.nextSibling) {
- if (isEndComment(currentNode)) {
- depth--;
- if (depth === 0)
- return children;
- }
-
- children.push(currentNode);
-
- if (isStartComment(currentNode))
- depth++;
- }
- if (!allowUnbalanced)
- throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
- return null;
- }
-
- function getMatchingEndComment(startComment, allowUnbalanced) {
- var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
- if (allVirtualChildren) {
- if (allVirtualChildren.length > 0)
- return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
- return startComment.nextSibling;
- } else
- return null; // Must have no matching end comment, and allowUnbalanced is true
- }
-
- function getUnbalancedChildTags(node) {
- // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
- // from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko -->
- var childNode = node.firstChild, captureRemaining = null;
- if (childNode) {
- do {
- if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes
- captureRemaining.push(childNode);
- else if (isStartComment(childNode)) {
- var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
- if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set
- childNode = matchingEndComment;
- else
- captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
- } else if (isEndComment(childNode)) {
- captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
- }
- } while (childNode = childNode.nextSibling);
- }
- return captureRemaining;
- }
-
- ko.virtualElements = {
- allowedBindings: {},
-
- childNodes: function(node) {
- return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
- },
-
- emptyNode: function(node) {
- if (!isStartComment(node))
- ko.utils.emptyDomNode(node);
- else {
- var virtualChildren = ko.virtualElements.childNodes(node);
- for (var i = 0, j = virtualChildren.length; i < j; i++)
- ko.removeNode(virtualChildren[i]);
- }
- },
-
- setDomNodeChildren: function(node, childNodes) {
- if (!isStartComment(node))
- ko.utils.setDomNodeChildren(node, childNodes);
- else {
- ko.virtualElements.emptyNode(node);
- var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
- for (var i = 0, j = childNodes.length; i < j; i++)
- endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
- }
- },
-
- prepend: function(containerNode, nodeToPrepend) {
- if (!isStartComment(containerNode)) {
- if (containerNode.firstChild)
- containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
- else
- containerNode.appendChild(nodeToPrepend);
- } else {
- // Start comments must always have a parent and at least one following sibling (the end comment)
- containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
- }
- },
-
- insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
- if (!insertAfterNode) {
- ko.virtualElements.prepend(containerNode, nodeToInsert);
- } else if (!isStartComment(containerNode)) {
- // Insert after insertion point
- if (insertAfterNode.nextSibling)
- containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
- else
- containerNode.appendChild(nodeToInsert);
- } else {
- // Children of start comments must always have a parent and at least one following sibling (the end comment)
- containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
- }
- },
-
- firstChild: function(node) {
- if (!isStartComment(node))
- return node.firstChild;
- if (!node.nextSibling || isEndComment(node.nextSibling))
- return null;
- return node.nextSibling;
- },
-
- nextSibling: function(node) {
- if (isStartComment(node))
- node = getMatchingEndComment(node);
- if (node.nextSibling && isEndComment(node.nextSibling))
- return null;
- return node.nextSibling;
- },
-
- virtualNodeBindingValue: function(node) {
- var regexMatch = isStartComment(node);
- return regexMatch ? regexMatch[1] : null;
- },
-
- normaliseVirtualElementDomStructure: function(elementVerified) {
- // Workaround for https://github.com/SteveSanderson/knockout/issues/155
- // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
- // that are direct descendants of <ul> into the preceding <li>)
- if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
- return;
-
- // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
- // must be intended to appear *after* that child, so move them there.
- var childNode = elementVerified.firstChild;
- if (childNode) {
- do {
- if (childNode.nodeType === 1) {
- var unbalancedTags = getUnbalancedChildTags(childNode);
- if (unbalancedTags) {
- // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
- var nodeToInsertBefore = childNode.nextSibling;
- for (var i = 0; i < unbalancedTags.length; i++) {
- if (nodeToInsertBefore)
- elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
- else
- elementVerified.appendChild(unbalancedTags[i]);
- }
- }
- }
- } while (childNode = childNode.nextSibling);
- }
- }
- };
-})();
-ko.exportSymbol('virtualElements', ko.virtualElements);
-ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
-ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
-//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified
-ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
-//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
-ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
-ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
-(function() {
- var defaultBindingAttributeName = "data-bind";
-
- ko.bindingProvider = function() {
- this.bindingCache = {};
- };
-
- ko.utils.extend(ko.bindingProvider.prototype, {
- 'nodeHasBindings': function(node) {
- switch (node.nodeType) {
- case 1: return node.getAttribute(defaultBindingAttributeName) != null; // Element
- case 8: return ko.virtualElements.virtualNodeBindingValue(node) != null; // Comment node
- default: return false;
- }
- },
-
- 'getBindings': function(node, bindingContext) {
- var bindingsString = this['getBindingsString'](node, bindingContext);
- return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
- },
-
- // The following function is only used internally by this default provider.
- // It's not part of the interface definition for a general binding provider.
- 'getBindingsString': function(node, bindingContext) {
- switch (node.nodeType) {
- case 1: return node.getAttribute(defaultBindingAttributeName); // Element
- case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
- default: return null;
- }
- },
-
- // The following function is only used internally by this default provider.
- // It's not part of the interface definition for a general binding provider.
- 'parseBindingsString': function(bindingsString, bindingContext, node) {
- try {
- var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache);
- return bindingFunction(bindingContext, node);
- } catch (ex) {
- throw new Error("Unable to parse bindings.\nMessage: " + ex + ";\nBindings value: " + bindingsString);
- }
- }
- });
-
- ko.bindingProvider['instance'] = new ko.bindingProvider();
-
- function createBindingsStringEvaluatorViaCache(bindingsString, cache) {
- var cacheKey = bindingsString;
- return cache[cacheKey]
- || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString));
- }
-
- function createBindingsStringEvaluator(bindingsString) {
- // Build the source for a function that evaluates "expression"
- // For each scope variable, add an extra level of "with" nesting
- // Example result: with(sc1) { with(sc0) { return (expression) } }
- var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString),
- functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
- return new Function("$context", "$element", functionBody);
- }
-})();
-
-ko.exportSymbol('bindingProvider', ko.bindingProvider);
-(function () {
- ko.bindingHandlers = {};
-
- ko.bindingContext = function(dataItem, parentBindingContext, dataItemAlias) {
- if (parentBindingContext) {
- ko.utils.extend(this, parentBindingContext); // Inherit $root and any custom properties
- this['$parentContext'] = parentBindingContext;
- this['$parent'] = parentBindingContext['$data'];
- this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
- this['$parents'].unshift(this['$parent']);
- } else {
- this['$parents'] = [];
- this['$root'] = dataItem;
- // Export 'ko' in the binding context so it will be available in bindings and templates
- // even if 'ko' isn't exported as a global, such as when using an AMD loader.
- // See https://github.com/SteveSanderson/knockout/issues/490
- this['ko'] = ko;
- }
- this['$data'] = dataItem;
- if (dataItemAlias)
- this[dataItemAlias] = dataItem;
- }
- ko.bindingContext.prototype['createChildContext'] = function (dataItem, dataItemAlias) {
- return new ko.bindingContext(dataItem, this, dataItemAlias);
- };
- ko.bindingContext.prototype['extend'] = function(properties) {
- var clone = ko.utils.extend(new ko.bindingContext(), this);
- return ko.utils.extend(clone, properties);
- };
-
- function validateThatBindingIsAllowedForVirtualElements(bindingName) {
- var validator = ko.virtualElements.allowedBindings[bindingName];
- if (!validator)
- throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
- }
-
- function applyBindingsToDescendantsInternal (viewModel, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
- var currentChild, nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
- while (currentChild = nextInQueue) {
- // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
- nextInQueue = ko.virtualElements.nextSibling(currentChild);
- applyBindingsToNodeAndDescendantsInternal(viewModel, currentChild, bindingContextsMayDifferFromDomParentElement);
- }
- }
-
- function applyBindingsToNodeAndDescendantsInternal (viewModel, nodeVerified, bindingContextMayDifferFromDomParentElement) {
- var shouldBindDescendants = true;
-
- // Perf optimisation: Apply bindings only if...
- // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
- // Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
- // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
- var isElement = (nodeVerified.nodeType === 1);
- if (isElement) // Workaround IE <= 8 HTML parsing weirdness
- ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
-
- var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement) // Case (1)
- || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
- if (shouldApplyBindings)
- shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, viewModel, bindingContextMayDifferFromDomParentElement).shouldBindDescendants;
-
- if (shouldBindDescendants) {
- // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
- // * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
- // hence bindingContextsMayDifferFromDomParentElement is false
- // * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
- // skip over any number of intermediate virtual elements, any of which might define a custom binding context,
- // hence bindingContextsMayDifferFromDomParentElement is true
- applyBindingsToDescendantsInternal(viewModel, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
- }
- }
-
- function applyBindingsToNodeInternal (node, bindings, viewModelOrBindingContext, bindingContextMayDifferFromDomParentElement) {
- // Need to be sure that inits are only run once, and updates never run until all the inits have been run
- var initPhase = 0; // 0 = before all inits, 1 = during inits, 2 = after all inits
-
- // Each time the dependentObservable is evaluated (after data changes),
- // the binding attribute is reparsed so that it can pick out the correct
- // model properties in the context of the changed data.
- // DOM event callbacks need to be able to access this changed data,
- // so we need a single parsedBindings variable (shared by all callbacks
- // associated with this node's bindings) that all the closures can access.
- var parsedBindings;
- function makeValueAccessor(bindingKey) {
- return function () { return parsedBindings[bindingKey] }
- }
- function parsedBindingsAccessor() {
- return parsedBindings;
- }
-
- var bindingHandlerThatControlsDescendantBindings;
- ko.dependentObservable(
- function () {
- // Ensure we have a nonnull binding context to work with
- var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
- ? viewModelOrBindingContext
- : new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
- var viewModel = bindingContextInstance['$data'];
-
- // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
- // we can easily recover it just by scanning up the node's ancestors in the DOM
- // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
- if (bindingContextMayDifferFromDomParentElement)
- ko.storedBindingContextForNode(node, bindingContextInstance);
-
- // Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
- var evaluatedBindings = (typeof bindings == "function") ? bindings(bindingContextInstance, node) : bindings;
- parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);
-
- if (parsedBindings) {
- // First run all the inits, so bindings can register for notification on changes
- if (initPhase === 0) {
- initPhase = 1;
- for (var bindingKey in parsedBindings) {
- var binding = ko.bindingHandlers[bindingKey];
- if (binding && node.nodeType === 8)
- validateThatBindingIsAllowedForVirtualElements(bindingKey);
-
- if (binding && typeof binding["init"] == "function") {
- var handlerInitFn = binding["init"];
- var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
-
- // If this binding handler claims to control descendant bindings, make a note of this
- if (initResult && initResult['controlsDescendantBindings']) {
- if (bindingHandlerThatControlsDescendantBindings !== undefined)
- throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
- bindingHandlerThatControlsDescendantBindings = bindingKey;
- }
- }
- }
- initPhase = 2;
- }
-
- // ... then run all the updates, which might trigger changes even on the first evaluation
- if (initPhase === 2) {
- for (var bindingKey in parsedBindings) {
- var binding = ko.bindingHandlers[bindingKey];
- if (binding && typeof binding["update"] == "function") {
- var handlerUpdateFn = binding["update"];
- handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
- }
- }
- }
- }
- },
- null,
- { disposeWhenNodeIsRemoved : node }
- );
-
- return {
- shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
- };
- };
-
- var storedBindingContextDomDataKey = "__ko_bindingContext__";
- ko.storedBindingContextForNode = function (node, bindingContext) {
- if (arguments.length == 2)
- ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
- else
- return ko.utils.domData.get(node, storedBindingContextDomDataKey);
- }
-
- ko.applyBindingsToNode = function (node, bindings, viewModel) {
- if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
- ko.virtualElements.normaliseVirtualElementDomStructure(node);
- return applyBindingsToNodeInternal(node, bindings, viewModel, true);
- };
-
- ko.applyBindingsToDescendants = function(viewModel, rootNode) {
- if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
- applyBindingsToDescendantsInternal(viewModel, rootNode, true);
- };
-
- ko.applyBindings = function (viewModel, rootNode) {
- if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
- throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
- rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
-
- applyBindingsToNodeAndDescendantsInternal(viewModel, rootNode, true);
- };
-
- // Retrieving binding context from arbitrary nodes
- ko.contextFor = function(node) {
- // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
- switch (node.nodeType) {
- case 1:
- case 8:
- var context = ko.storedBindingContextForNode(node);
- if (context) return context;
- if (node.parentNode) return ko.contextFor(node.parentNode);
- break;
- }
- return undefined;
- };
- ko.dataFor = function(node) {
- var context = ko.contextFor(node);
- return context ? context['$data'] : undefined;
- };
-
- ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
- ko.exportSymbol('applyBindings', ko.applyBindings);
- ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
- ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
- ko.exportSymbol('contextFor', ko.contextFor);
- ko.exportSymbol('dataFor', ko.dataFor);
-})();
-var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
-ko.bindingHandlers['attr'] = {
- 'update': function(element, valueAccessor, allBindingsAccessor) {
- var value = ko.utils.unwrapObservable(valueAccessor()) || {};
- for (var attrName in value) {
- if (typeof attrName == "string") {
- var attrValue = ko.utils.unwrapObservable(value[attrName]);
-
- // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
- // when someProp is a "no value"-like value (strictly null, false, or undefined)
- // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
- var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
- if (toRemove)
- element.removeAttribute(attrName);
-
- // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
- // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
- // but instead of figuring out the mode, we'll just set the attribute through the Javascript
- // property for IE <= 8.
- if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
- attrName = attrHtmlToJavascriptMap[attrName];
- if (toRemove)
- element.removeAttribute(attrName);
- else
- element[attrName] = attrValue;
- } else if (!toRemove) {
- element.setAttribute(attrName, attrValue.toString());
- }
-
- // Treat "name" specially - although you can think of it as an attribute, it also needs
- // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
- // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
- // entirely, and there's no strong reason to allow for such casing in HTML.
- if (attrName === "name") {
- ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
- }
- }
- }
- }
-};
-ko.bindingHandlers['checked'] = {
- 'init': function (element, valueAccessor, allBindingsAccessor) {
- var updateHandler = function() {
- var valueToWrite;
- if (element.type == "checkbox") {
- valueToWrite = element.checked;
- } else if ((element.type == "radio") && (element.checked)) {
- valueToWrite = element.value;
- } else {
- return; // "checked" binding only responds to checkboxes and selected radio buttons
- }
-
- var modelValue = valueAccessor(), unwrappedValue = ko.utils.unwrapObservable(modelValue);
- if ((element.type == "checkbox") && (unwrappedValue instanceof Array)) {
- // For checkboxes bound to an array, we add/remove the checkbox value to that array
- // This works for both observable and non-observable arrays
- var existingEntryIndex = ko.utils.arrayIndexOf(unwrappedValue, element.value);
- if (element.checked && (existingEntryIndex < 0))
- modelValue.push(element.value);
- else if ((!element.checked) && (existingEntryIndex >= 0))
- modelValue.splice(existingEntryIndex, 1);
- } else {
- ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true);
- }
- };
- ko.utils.registerEventHandler(element, "click", updateHandler);
-
- // IE 6 won't allow radio buttons to be selected unless they have a name
- if ((element.type == "radio") && !element.name)
- ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
- },
- 'update': function (element, valueAccessor) {
- var value = ko.utils.unwrapObservable(valueAccessor());
-
- if (element.type == "checkbox") {
- if (value instanceof Array) {
- // When bound to an array, the checkbox being checked represents its value being present in that array
- element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
- } else {
- // When bound to anything other value (not an array), the checkbox being checked represents the value being trueish
- element.checked = value;
- }
- } else if (element.type == "radio") {
- element.checked = (element.value == value);
- }
- }
-};
-var classesWrittenByBindingKey = '__ko__cssValue';
-ko.bindingHandlers['css'] = {
- 'update': function (element, valueAccessor) {
- var value = ko.utils.unwrapObservable(valueAccessor());
- if (typeof value == "object") {
- for (var className in value) {
- var shouldHaveClass = ko.utils.unwrapObservable(value[className]);
- ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
- }
- } else {
- value = String(value || ''); // Make sure we don't try to store or set a non-string value
- ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
- element[classesWrittenByBindingKey] = value;
- ko.utils.toggleDomNodeCssClass(element, value, true);
- }
- }
-};
-ko.bindingHandlers['enable'] = {
- 'update': function (element, valueAccessor) {
- var value = ko.utils.unwrapObservable(valueAccessor());
- if (value && element.disabled)
- element.removeAttribute("disabled");
- else if ((!value) && (!element.disabled))
- element.disabled = true;
- }
-};
-
-ko.bindingHandlers['disable'] = {
- 'update': function (element, valueAccessor) {
- ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
- }
-};
-// For certain common events (currently just 'click'), allow a simplified data-binding syntax
-// e.g. click:handler instead of the usual full-length event:{click:handler}
-function makeEventHandlerShortcut(eventName) {
- ko.bindingHandlers[eventName] = {
- 'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
- var newValueAccessor = function () {
- var result = {};
- result[eventName] = valueAccessor();
- return result;
- };
- return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
- }
- }
-}
-
-ko.bindingHandlers['event'] = {
- 'init' : function (element, valueAccessor, allBindingsAccessor, viewModel) {
- var eventsToHandle = valueAccessor() || {};
- for(var eventNameOutsideClosure in eventsToHandle) {
- (function() {
- var eventName = eventNameOutsideClosure; // Separate variable to be captured by event handler closure
- if (typeof eventName == "string") {
- ko.utils.registerEventHandler(element, eventName, function (event) {
- var handlerReturnValue;
- var handlerFunction = valueAccessor()[eventName];
- if (!handlerFunction)
- return;
- var allBindings = allBindingsAccessor();
-
- try {
- // Take all the event args, and prefix with the viewmodel
- var argsForHandler = ko.utils.makeArray(arguments);
- argsForHandler.unshift(viewModel);
- handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
- } finally {
- if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
- if (event.preventDefault)
- event.preventDefault();
- else
- event.returnValue = false;
- }
- }
-
- var bubble = allBindings[eventName + 'Bubble'] !== false;
- if (!bubble) {
- event.cancelBubble = true;
- if (event.stopPropagation)
- event.stopPropagation();
- }
- });
- }
- })();
- }
- }
-};
-// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
-// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
-ko.bindingHandlers['foreach'] = {
- makeTemplateValueAccessor: function(valueAccessor) {
- return function() {
- var modelValue = valueAccessor(),
- unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here
-
- // If unwrappedValue is the array, pass in the wrapped value on its own
- // The value will be unwrapped and tracked within the template binding
- // (See https://github.com/SteveSanderson/knockout/issues/523)
- if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
- return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
-
- // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
- ko.utils.unwrapObservable(modelValue);
- return {
- 'foreach': unwrappedValue['data'],
- 'as': unwrappedValue['as'],
- 'includeDestroyed': unwrappedValue['includeDestroyed'],
- 'afterAdd': unwrappedValue['afterAdd'],
- 'beforeRemove': unwrappedValue['beforeRemove'],
- 'afterRender': unwrappedValue['afterRender'],
- 'beforeMove': unwrappedValue['beforeMove'],
- 'afterMove': unwrappedValue['afterMove'],
- 'templateEngine': ko.nativeTemplateEngine.instance
- };
- };
- },
- 'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
- return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
- },
- 'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
- return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
- }
-};
-ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
-ko.virtualElements.allowedBindings['foreach'] = true;
-var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
-ko.bindingHandlers['hasfocus'] = {
- 'init': function(element, valueAccessor, allBindingsAccessor) {
- var handleElementFocusChange = function(isFocused) {
- // Where possible, ignore which event was raised and determine focus state using activeElement,
- // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
- // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
- // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
- // from calling 'blur()' on the element when it loses focus.
- // Discussion at https://github.com/SteveSanderson/knockout/pull/352
- element[hasfocusUpdatingProperty] = true;
- var ownerDoc = element.ownerDocument;
- if ("activeElement" in ownerDoc) {
- isFocused = (ownerDoc.activeElement === element);
- }
- var modelValue = valueAccessor();
- ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'hasfocus', isFocused, true);
- element[hasfocusUpdatingProperty] = false;
- };
- var handleElementFocusIn = handleElementFocusChange.bind(null, true);
- var handleElementFocusOut = handleElementFocusChange.bind(null, false);
-
- ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
- ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
- ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
- ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
- },
- 'update': function(element, valueAccessor) {
- if (!element[hasfocusUpdatingProperty]) {
- var value = ko.utils.unwrapObservable(valueAccessor());
- value ? element.focus() : element.blur();
- ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
- }
- }
-};
-ko.bindingHandlers['html'] = {
- 'init': function() {
- // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
- return { 'controlsDescendantBindings': true };
- },
- 'update': function (element, valueAccessor) {
- // setHtml will unwrap the value if needed
- ko.utils.setHtml(element, valueAccessor());
- }
-};
-var withIfDomDataKey = '__ko_withIfBindingData';
-// Makes a binding like with or if
-function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
- ko.bindingHandlers[bindingKey] = {
- 'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
- ko.utils.domData.set(element, withIfDomDataKey, {});
- return { 'controlsDescendantBindings': true };
- },
- 'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
- var withIfData = ko.utils.domData.get(element, withIfDomDataKey),
- dataValue = ko.utils.unwrapObservable(valueAccessor()),
- shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
- isFirstRender = !withIfData.savedNodes,
- needsRefresh = isFirstRender || isWith || (shouldDisplay !== withIfData.didDisplayOnLastUpdate);
-
- if (needsRefresh) {
- if (isFirstRender) {
- withIfData.savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
- }
-
- if (shouldDisplay) {
- if (!isFirstRender) {
- ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(withIfData.savedNodes));
- }
- ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
- } else {
- ko.virtualElements.emptyNode(element);
- }
-
- withIfData.didDisplayOnLastUpdate = shouldDisplay;
- }
- }
- };
- ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
- ko.virtualElements.allowedBindings[bindingKey] = true;
-}
-
-// Construct the actual binding handlers
-makeWithIfBinding('if');
-makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
-makeWithIfBinding('with', true /* isWith */, false /* isNot */,
- function(bindingContext, dataValue) {
- return bindingContext['createChildContext'](dataValue);
- }
-);
-function ensureDropdownSelectionIsConsistentWithModelValue(element, modelValue, preferModelValue) {
- if (preferModelValue) {
- if (modelValue !== ko.selectExtensions.readValue(element))
- ko.selectExtensions.writeValue(element, modelValue);
- }
-
- // No matter which direction we're syncing in, we want the end result to be equality between dropdown value and model value.
- // If they aren't equal, either we prefer the dropdown value, or the model value couldn't be represented, so either way,
- // change the model value to match the dropdown.
- if (modelValue !== ko.selectExtensions.readValue(element))
- ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
-};
-
-ko.bindingHandlers['options'] = {
- 'update': function (element, valueAccessor, allBindingsAccessor) {
- if (ko.utils.tagNameLower(element) !== "select")
- throw new Error("options binding applies only to SELECT elements");
-
- var selectWasPreviouslyEmpty = element.length == 0;
- var previousSelectedValues = ko.utils.arrayMap(ko.utils.arrayFilter(element.childNodes, function (node) {
- return node.tagName && (ko.utils.tagNameLower(node) === "option") && node.selected;
- }), function (node) {
- return ko.selectExtensions.readValue(node) || node.innerText || node.textContent;
- });
- var previousScrollTop = element.scrollTop;
-
- var value = ko.utils.unwrapObservable(valueAccessor());
- var selectedValue = element.value;
-
- // Remove all existing <option>s.
- // Need to use .remove() rather than .removeChild() for <option>s otherwise IE behaves oddly (https://github.com/SteveSanderson/knockout/issues/134)
- while (element.length > 0) {
- ko.cleanNode(element.options[0]);
- element.remove(0);
- }
-
- if (value) {
- var allBindings = allBindingsAccessor(),
- includeDestroyed = allBindings['optionsIncludeDestroyed'];
-
- if (typeof value.length != "number")
- value = [value];
- if (allBindings['optionsCaption']) {
- var option = document.createElement("option");
- ko.utils.setHtml(option, allBindings['optionsCaption']);
- ko.selectExtensions.writeValue(option, undefined);
- element.appendChild(option);
- }
-
- for (var i = 0, j = value.length; i < j; i++) {
- // Skip destroyed items
- var arrayEntry = value[i];
- if (arrayEntry && arrayEntry['_destroy'] && !includeDestroyed)
- continue;
-
- var option = document.createElement("option");
-
- function applyToObject(object, predicate, defaultValue) {
- var predicateType = typeof predicate;
- if (predicateType == "function") // Given a function; run it against the data value
- return predicate(object);
- else if (predicateType == "string") // Given a string; treat it as a property name on the data value
- return object[predicate];
- else // Given no optionsText arg; use the data value itself
- return defaultValue;
- }
-
- // Apply a value to the option element
- var optionValue = applyToObject(arrayEntry, allBindings['optionsValue'], arrayEntry);
- ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
-
- // Apply some text to the option element
- var optionText = applyToObject(arrayEntry, allBindings['optionsText'], optionValue);
- ko.utils.setTextContent(option, optionText);
-
- element.appendChild(option);
- }
-
- // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
- // That's why we first added them without selection. Now it's time to set the selection.
- var newOptions = element.getElementsByTagName("option");
- var countSelectionsRetained = 0;
- for (var i = 0, j = newOptions.length; i < j; i++) {
- if (ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[i])) >= 0) {
- ko.utils.setOptionNodeSelectionState(newOptions[i], true);
- countSelectionsRetained++;
- }
- }
-
- element.scrollTop = previousScrollTop;
-
- if (selectWasPreviouslyEmpty && ('value' in allBindings)) {
- // Ensure consistency between model value and selected option.
- // If the dropdown is being populated for the first time here (or was otherwise previously empty),
- // the dropdown selection state is meaningless, so we preserve the model value.
- ensureDropdownSelectionIsConsistentWithModelValue(element, ko.utils.peekObservable(allBindings['value']), /* preferModelValue */ true);
- }
-
- // Workaround for IE9 bug
- ko.utils.ensureSelectElementIsRenderedCorrectly(element);
- }
- }
-};
-ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.optionValueDomData__';
-ko.bindingHandlers['selectedOptions'] = {
- 'init': function (element, valueAccessor, allBindingsAccessor) {
- ko.utils.registerEventHandler(element, "change", function () {
- var value = valueAccessor(), valueToWrite = [];
- ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
- if (node.selected)
- valueToWrite.push(ko.selectExtensions.readValue(node));
- });
- ko.expressionRewriting.writeValueToProperty(value, allBindingsAccessor, 'value', valueToWrite);
- });
- },
- 'update': function (element, valueAccessor) {
- if (ko.utils.tagNameLower(element) != "select")
- throw new Error("values binding applies only to SELECT elements");
-
- var newValue = ko.utils.unwrapObservable(valueAccessor());
- if (newValue && typeof newValue.length == "number") {
- ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
- var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
- ko.utils.setOptionNodeSelectionState(node, isSelected);
- });
- }
- }
-};
-ko.bindingHandlers['style'] = {
- 'update': function (element, valueAccessor) {
- var value = ko.utils.unwrapObservable(valueAccessor() || {});
- for (var styleName in value) {
- if (typeof styleName == "string") {
- var styleValue = ko.utils.unwrapObservable(value[styleName]);
- element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
- }
- }
- }
-};
-ko.bindingHandlers['submit'] = {
- 'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
- if (typeof valueAccessor() != "function")
- throw new Error("The value for a submit binding must be a function");
- ko.utils.registerEventHandler(element, "submit", function (event) {
- var handlerReturnValue;
- var value = valueAccessor();
- try { handlerReturnValue = value.call(viewModel, element); }
- finally {
- if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
- if (event.preventDefault)
- event.preventDefault();
- else
- event.returnValue = false;
- }
- }
- });
- }
-};
-ko.bindingHandlers['text'] = {
- 'update': function (element, valueAccessor) {
- ko.utils.setTextContent(element, valueAccessor());
- }
-};
-ko.virtualElements.allowedBindings['text'] = true;
-ko.bindingHandlers['uniqueName'] = {
- 'init': function (element, valueAccessor) {
- if (valueAccessor()) {
- var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
- ko.utils.setElementName(element, name);
- }
- }
-};
-ko.bindingHandlers['uniqueName'].currentIndex = 0;
-ko.bindingHandlers['value'] = {
- 'init': function (element, valueAccessor, allBindingsAccessor) {
- // Always catch "change" event; possibly other events too if asked
- var eventsToCatch = ["change"];
- var requestedEventsToCatch = allBindingsAccessor()["valueUpdate"];
- if (requestedEventsToCatch) {
- if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
- requestedEventsToCatch = [requestedEventsToCatch];
- ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
- eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
- }
-
- var valueUpdateHandler = function() {
- var modelValue = valueAccessor();
- var elementValue = ko.selectExtensions.readValue(element);
- ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'value', elementValue);
- }
-
- // Workaround for https://github.com/SteveSanderson/knockout/issues/122
- // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
- var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
- && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
- if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
- var propertyChangedFired = false;
- ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
- ko.utils.registerEventHandler(element, "blur", function() {
- if (propertyChangedFired) {
- propertyChangedFired = false;
- valueUpdateHandler();
- }
- });
- }
-
- ko.utils.arrayForEach(eventsToCatch, function(eventName) {
- // The syntax "after<eventname>" means "run the handler asynchronously after the event"
- // This is useful, for example, to catch "keydown" events after the browser has updated the control
- // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
- var handler = valueUpdateHandler;
- if (ko.utils.stringStartsWith(eventName, "after")) {
- handler = function() { setTimeout(valueUpdateHandler, 0) };
- eventName = eventName.substring("after".length);
- }
- ko.utils.registerEventHandler(element, eventName, handler);
- });
- },
- 'update': function (element, valueAccessor) {
- var valueIsSelectOption = ko.utils.tagNameLower(element) === "select";
- var newValue = ko.utils.unwrapObservable(valueAccessor());
- var elementValue = ko.selectExtensions.readValue(element);
- var valueHasChanged = (newValue != elementValue);
-
- // JavaScript's 0 == "" behavious is unfortunate here as it prevents writing 0 to an empty text box (loose equality suggests the values are the same).
- // We don't want to do a strict equality comparison as that is more confusing for developers in certain cases, so we specifically special case 0 != "" here.
- if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0"))
- valueHasChanged = true;
-
- if (valueHasChanged) {
- var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue); };
- applyValueAction();
-
- // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
- // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
- // to apply the value as well.
- var alsoApplyAsynchronously = valueIsSelectOption;
- if (alsoApplyAsynchronously)
- setTimeout(applyValueAction, 0);
- }
-
- // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
- // because you're not allowed to have a model value that disagrees with a visible UI selection.
- if (valueIsSelectOption && (element.length > 0))
- ensureDropdownSelectionIsConsistentWithModelValue(element, newValue, /* preferModelValue */ false);
- }
-};
-ko.bindingHandlers['visible'] = {
- 'update': function (element, valueAccessor) {
- var value = ko.utils.unwrapObservable(valueAccessor());
- var isCurrentlyVisible = !(element.style.display == "none");
- if (value && !isCurrentlyVisible)
- element.style.display = "";
- else if ((!value) && isCurrentlyVisible)
- element.style.display = "none";
- }
-};
-// 'click' is just a shorthand for the usual full-length event:{click:handler}
-makeEventHandlerShortcut('click');
-// If you want to make a custom template engine,
-//
-// [1] Inherit from this class (like ko.nativeTemplateEngine does)
-// [2] Override 'renderTemplateSource', supplying a function with this signature:
-//
-// function (templateSource, bindingContext, options) {
-// // - templateSource.text() is the text of the template you should render
-// // - bindingContext.$data is the data you should pass into the template
-// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
-// // and bindingContext.$root available in the template too
-// // - options gives you access to any other properties set on "data-bind: { template: options }"
-// //
-// // Return value: an array of DOM nodes
-// }
-//
-// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
-//
-// function (script) {
-// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
-// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
-// }
-//
-// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
-// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
-// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
-
-ko.templateEngine = function () { };
-
-ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
- throw new Error("Override renderTemplateSource");
-};
-
-ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
- throw new Error("Override createJavaScriptEvaluatorBlock");
-};
-
-ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
- // Named template
- if (typeof template == "string") {
- templateDocument = templateDocument || document;
- var elem = templateDocument.getElementById(template);
- if (!elem)
- throw new Error("Cannot find template with ID " + template);
- return new ko.templateSources.domElement(elem);
- } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
- // Anonymous template
- return new ko.templateSources.anonymousTemplate(template);
- } else
- throw new Error("Unknown template type: " + template);
-};
-
-ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
- var templateSource = this['makeTemplateSource'](template, templateDocument);
- return this['renderTemplateSource'](templateSource, bindingContext, options);
-};
-
-ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
- // Skip rewriting if requested
- if (this['allowTemplateRewriting'] === false)
- return true;
- return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
-};
-
-ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
- var templateSource = this['makeTemplateSource'](template, templateDocument);
- var rewritten = rewriterCallback(templateSource['text']());
- templateSource['text'](rewritten);
- templateSource['data']("isRewritten", true);
-};
-
-ko.exportSymbol('templateEngine', ko.templateEngine);
-
-ko.templateRewriting = (function () {
- var memoizeDataBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9\-]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/gi;
- var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
-
- function validateDataBindValuesForRewriting(keyValueArray) {
- var allValidators = ko.expressionRewriting.bindingRewriteValidators;
- for (var i = 0; i < keyValueArray.length; i++) {
- var key = keyValueArray[i]['key'];
- if (allValidators.hasOwnProperty(key)) {
- var validator = allValidators[key];
-
- if (typeof validator === "function") {
- var possibleErrorMessage = validator(keyValueArray[i]['value']);
- if (possibleErrorMessage)
- throw new Error(possibleErrorMessage);
- } else if (!validator) {
- throw new Error("This template engine does not support the '" + key + "' binding within its templates");
- }
- }
- }
- }
-
- function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, templateEngine) {
- var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
- validateDataBindValuesForRewriting(dataBindKeyValueArray);
- var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray);
-
- // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
- // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
- // extra indirection.
- var applyBindingsToNextSiblingScript =
- "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()})";
- return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
- }
-
- return {
- ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
- if (!templateEngine['isTemplateRewritten'](template, templateDocument))
- templateEngine['rewriteTemplate'](template, function (htmlString) {
- return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
- }, templateDocument);
- },
-
- memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
- return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
- return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[6], /* tagToRetain: */ arguments[1], templateEngine);
- }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
- return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", templateEngine);
- });
- },
-
- applyMemoizedBindingsToNextSibling: function (bindings) {
- return ko.memoization.memoize(function (domNode, bindingContext) {
- if (domNode.nextSibling)
- ko.applyBindingsToNode(domNode.nextSibling, bindings, bindingContext);
- });
- }
- }
-})();
-
-
-// Exported only because it has to be referenced by string lookup from within rewritten template
-ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
-(function() {
- // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
- // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
- //
- // Two are provided by default:
- // 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
- // 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
- // without reading/writing the actual element text content, since it will be overwritten
- // with the rendered template output.
- // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
- // Template sources need to have the following functions:
- // text() - returns the template text from your storage location
- // text(value) - writes the supplied template text to your storage location
- // data(key) - reads values stored using data(key, value) - see below
- // data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
- //
- // Optionally, template sources can also have the following functions:
- // nodes() - returns a DOM element containing the nodes of this template, where available
- // nodes(value) - writes the given DOM element to your storage location
- // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
- // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
- //
- // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
- // using and overriding "makeTemplateSource" to return an instance of your custom template source.
-
- ko.templateSources = {};
-
- // ---- ko.templateSources.domElement -----
-
- ko.templateSources.domElement = function(element) {
- this.domElement = element;
- }
-
- ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
- var tagNameLower = ko.utils.tagNameLower(this.domElement),
- elemContentsProperty = tagNameLower === "script" ? "text"
- : tagNameLower === "textarea" ? "value"
- : "innerHTML";
-
- if (arguments.length == 0) {
- return this.domElement[elemContentsProperty];
- } else {
- var valueToWrite = arguments[0];
- if (elemContentsProperty === "innerHTML")
- ko.utils.setHtml(this.domElement, valueToWrite);
- else
- this.domElement[elemContentsProperty] = valueToWrite;
- }
- };
-
- ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
- if (arguments.length === 1) {
- return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
- } else {
- ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
- }
- };
-
- // ---- ko.templateSources.anonymousTemplate -----
- // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
- // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
- // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
-
- var anonymousTemplatesDomDataKey = "__ko_anon_template__";
- ko.templateSources.anonymousTemplate = function(element) {
- this.domElement = element;
- }
- ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
- ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
- if (arguments.length == 0) {
- var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
- if (templateData.textData === undefined && templateData.containerData)
- templateData.textData = templateData.containerData.innerHTML;
- return templateData.textData;
- } else {
- var valueToWrite = arguments[0];
- ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {textData: valueToWrite});
- }
- };
- ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
- if (arguments.length == 0) {
- var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
- return templateData.containerData;
- } else {
- var valueToWrite = arguments[0];
- ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {containerData: valueToWrite});
- }
- };
-
- ko.exportSymbol('templateSources', ko.templateSources);
- ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
- ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
-})();
-(function () {
- var _templateEngine;
- ko.setTemplateEngine = function (templateEngine) {
- if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
- throw new Error("templateEngine must inherit from ko.templateEngine");
- _templateEngine = templateEngine;
- }
-
- function invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, action) {
- var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
- while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
- nextInQueue = ko.virtualElements.nextSibling(node);
- if (node.nodeType === 1 || node.nodeType === 8)
- action(node);
- }
- }
-
- function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
- // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
- // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
- // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
- // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
- // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
-
- if (continuousNodeArray.length) {
- var firstNode = continuousNodeArray[0], lastNode = continuousNodeArray[continuousNodeArray.length - 1];
-
- // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
- // whereas a regular applyBindings won't introduce new memoized nodes
- invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
- ko.applyBindings(bindingContext, node);
- });
- invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
- ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
- });
- }
- }
-
- function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
- return nodeOrNodeArray.nodeType ? nodeOrNodeArray
- : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
- : null;
- }
-
- function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
- options = options || {};
- var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
- var templateDocument = firstTargetNode && firstTargetNode.ownerDocument;
- var templateEngineToUse = (options['templateEngine'] || _templateEngine);
- ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
- var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
-
- // Loosely check result is an array of DOM nodes
- if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
- throw new Error("Template engine must return an array of DOM nodes");
-
- var haveAddedNodesToParent = false;
- switch (renderMode) {
- case "replaceChildren":
- ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
- haveAddedNodesToParent = true;
- break;
- case "replaceNode":
- ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
- haveAddedNodesToParent = true;
- break;
- case "ignoreTargetNode": break;
- default:
- throw new Error("Unknown renderMode: " + renderMode);
- }
-
- if (haveAddedNodesToParent) {
- activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
- if (options['afterRender'])
- ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
- }
-
- return renderedNodesArray;
- }
-
- ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
- options = options || {};
- if ((options['templateEngine'] || _templateEngine) == undefined)
- throw new Error("Set a template engine before calling renderTemplate");
- renderMode = renderMode || "replaceChildren";
-
- if (targetNodeOrNodeArray) {
- var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
-
- var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
- var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
-
- return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
- function () {
- // Ensure we've got a proper binding context to work with
- var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
- ? dataOrBindingContext
- : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));
-
- // Support selecting template as a function of the data being rendered
- var templateName = typeof(template) == 'function' ? template(bindingContext['$data'], bindingContext) : template;
-
- var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
- if (renderMode == "replaceNode") {
- targetNodeOrNodeArray = renderedNodesArray;
- firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
- }
- },
- null,
- { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
- );
- } else {
- // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
- return ko.memoization.memoize(function (domNode) {
- ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
- });
- }
- };
-
- ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
- // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
- // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
- var arrayItemContext;
-
- // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
- var executeTemplateForArrayItem = function (arrayValue, index) {
- // Support selecting template as a function of the data being rendered
- arrayItemContext = parentBindingContext['createChildContext'](ko.utils.unwrapObservable(arrayValue), options['as']);
- arrayItemContext['$index'] = index;
- var templateName = typeof(template) == 'function' ? template(arrayValue, arrayItemContext) : template;
- return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
- }
-
- // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
- var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
- activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
- if (options['afterRender'])
- options['afterRender'](addedNodesArray, arrayValue);
- };
-
- return ko.dependentObservable(function () {
- var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
- if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
- unwrappedArray = [unwrappedArray];
-
- // Filter out any entries marked as destroyed
- var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
- return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
- });
-
- // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
- // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
- ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);
-
- }, null, { disposeWhenNodeIsRemoved: targetNode });
- };
-
- var templateComputedDomDataKey = '__ko__templateComputedDomDataKey__';
- function disposeOldComputedAndStoreNewOne(element, newComputed) {
- var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
- if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
- oldComputed.dispose();
- ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
- }
-
- ko.bindingHandlers['template'] = {
- 'init': function(element, valueAccessor) {
- // Support anonymous templates
- var bindingValue = ko.utils.unwrapObservable(valueAccessor());
- if ((typeof bindingValue != "string") && (!bindingValue['name']) && (element.nodeType == 1 || element.nodeType == 8)) {
- // It's an anonymous template - store the element contents, then clear the element
- var templateNodes = element.nodeType == 1 ? element.childNodes : ko.virtualElements.childNodes(element),
- container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
- new ko.templateSources.anonymousTemplate(element)['nodes'](container);
- }
- return { 'controlsDescendantBindings': true };
- },
- 'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
- var templateName = ko.utils.unwrapObservable(valueAccessor()),
- options = {},
- shouldDisplay = true,
- dataValue,
- templateComputed = null;
-
- if (typeof templateName != "string") {
- options = templateName;
- templateName = options['name'];
-
- // Support "if"/"ifnot" conditions
- if ('if' in options)
- shouldDisplay = ko.utils.unwrapObservable(options['if']);
- if (shouldDisplay && 'ifnot' in options)
- shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
-
- dataValue = ko.utils.unwrapObservable(options['data']);
- }
-
- if ('foreach' in options) {
- // Render once for each data point (treating data set as empty if shouldDisplay==false)
- var dataArray = (shouldDisplay && options['foreach']) || [];
- templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
- } else if (!shouldDisplay) {
- ko.virtualElements.emptyNode(element);
- } else {
- // Render once for this single data point (or use the viewModel if no data was provided)
- var innerBindingContext = ('data' in options) ?
- bindingContext['createChildContext'](dataValue, options['as']) : // Given an explitit 'data' value, we create a child binding context for it
- bindingContext; // Given no explicit 'data' value, we retain the same binding context
- templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
- }
-
- // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
- disposeOldComputedAndStoreNewOne(element, templateComputed);
- }
- };
-
- // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
- ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
- var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
-
- if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
- return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
-
- if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
- return null; // Named templates can be rewritten, so return "no error"
- return "This template engine does not support anonymous templates nested within its templates";
- };
-
- ko.virtualElements.allowedBindings['template'] = true;
-})();
-
-ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
-ko.exportSymbol('renderTemplate', ko.renderTemplate);
-
-ko.utils.compareArrays = (function () {
- var statusNotInOld = 'added', statusNotInNew = 'deleted';
-
- // Simple calculation based on Levenshtein distance.
- function compareArrays(oldArray, newArray, dontLimitMoves) {
- oldArray = oldArray || [];
- newArray = newArray || [];
-
- if (oldArray.length <= newArray.length)
- return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, dontLimitMoves);
- else
- return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, dontLimitMoves);
- }
-
- function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, dontLimitMoves) {
- var myMin = Math.min,
- myMax = Math.max,
- editDistanceMatrix = [],
- smlIndex, smlIndexMax = smlArray.length,
- bigIndex, bigIndexMax = bigArray.length,
- compareRange = (bigIndexMax - smlIndexMax) || 1,
- maxDistance = smlIndexMax + bigIndexMax + 1,
- thisRow, lastRow,
- bigIndexMaxForRow, bigIndexMinForRow;
-
- for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
- lastRow = thisRow;
- editDistanceMatrix.push(thisRow = []);
- bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
- bigIndexMinForRow = myMax(0, smlIndex - 1);
- for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
- if (!bigIndex)
- thisRow[bigIndex] = smlIndex + 1;
- else if (!smlIndex) // Top row - transform empty array into new array via additions
- thisRow[bigIndex] = bigIndex + 1;
- else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
- thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit)
- else {
- var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion)
- var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition)
- thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
- }
- }
- }
-
- var editScript = [], meMinusOne, notInSml = [], notInBig = [];
- for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
- meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
- if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
- notInSml.push(editScript[editScript.length] = { // added
- 'status': statusNotInSml,
- 'value': bigArray[--bigIndex],
- 'index': bigIndex });
- } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
- notInBig.push(editScript[editScript.length] = { // deleted
- 'status': statusNotInBig,
- 'value': smlArray[--smlIndex],
- 'index': smlIndex });
- } else {
- editScript.push({
- 'status': "retained",
- 'value': bigArray[--bigIndex] });
- --smlIndex;
- }
- }
-
- if (notInSml.length && notInBig.length) {
- // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
- // smlIndexMax keeps the time complexity of this algorithm linear.
- var limitFailedCompares = smlIndexMax * 10, failedCompares,
- a, d, notInSmlItem, notInBigItem;
- // Go through the items that have been added and deleted and try to find matches between them.
- for (failedCompares = a = 0; (dontLimitMoves || failedCompares < limitFailedCompares) && (notInSmlItem = notInSml[a]); a++) {
- for (d = 0; notInBigItem = notInBig[d]; d++) {
- if (notInSmlItem['value'] === notInBigItem['value']) {
- notInSmlItem['moved'] = notInBigItem['index'];
- notInBigItem['moved'] = notInSmlItem['index'];
- notInBig.splice(d,1); // This item is marked as moved; so remove it from notInBig list
- failedCompares = d = 0; // Reset failed compares count because we're checking for consecutive failures
- break;
- }
- }
- failedCompares += d;
- }
- }
- return editScript.reverse();
- }
-
- return compareArrays;
-})();
-
-ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
-
-(function () {
- // Objective:
- // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
- // map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
- // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
- // so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
- // previously mapped - retain those nodes, and just insert/delete other ones
-
- // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
- // You can use this, for example, to activate bindings on those nodes.
-
- function fixUpNodesToBeMovedOrRemoved(contiguousNodeArray) {
- // Before moving, deleting, or replacing a set of nodes that were previously outputted by the "map" function, we have to reconcile
- // them against what is in the DOM right now. It may be that some of the nodes have already been removed from the document,
- // or that new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
- // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
- // So, this function translates the old "map" output array into its best guess of what set of current DOM nodes should be removed.
- //
- // Rules:
- // [A] Any leading nodes that aren't in the document any more should be ignored
- // These most likely correspond to memoization nodes that were already removed during binding
- // See https://github.com/SteveSanderson/knockout/pull/440
- // [B] We want to output a contiguous series of nodes that are still in the document. So, ignore any nodes that
- // have already been removed, and include any nodes that have been inserted among the previous collection
-
- // Rule [A]
- while (contiguousNodeArray.length && !ko.utils.domNodeIsAttachedToDocument(contiguousNodeArray[0]))
- contiguousNodeArray.splice(0, 1);
-
- // Rule [B]
- if (contiguousNodeArray.length > 1) {
- // Build up the actual new contiguous node set
- var current = contiguousNodeArray[0], last = contiguousNodeArray[contiguousNodeArray.length - 1], newContiguousSet = [current];
- while (current !== last) {
- current = current.nextSibling;
- if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
- return;
- newContiguousSet.push(current);
- }
-
- // ... then mutate the input array to match this.
- // (The following line replaces the contents of contiguousNodeArray with newContiguousSet)
- Array.prototype.splice.apply(contiguousNodeArray, [0, contiguousNodeArray.length].concat(newContiguousSet));
- }
- return contiguousNodeArray;
- }
-
- function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
- // Map this array value inside a dependentObservable so we re-map when any dependency changes
- var mappedNodes = [];
- var dependentObservable = ko.dependentObservable(function() {
- var newMappedNodes = mapping(valueToMap, index) || [];
-
- // On subsequent evaluations, just replace the previously-inserted DOM nodes
- if (mappedNodes.length > 0) {
- ko.utils.replaceDomNodes(fixUpNodesToBeMovedOrRemoved(mappedNodes), newMappedNodes);
- if (callbackAfterAddingNodes)
- ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
- }
-
- // Replace the contents of the mappedNodes array, thereby updating the record
- // of which nodes would be deleted if valueToMap was itself later removed
- mappedNodes.splice(0, mappedNodes.length);
- ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
- }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return (mappedNodes.length == 0) || !ko.utils.domNodeIsAttachedToDocument(mappedNodes[0]) } });
- return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
- }
-
- var lastMappingResultDomDataKey = "setDomNodeChildrenFromArrayMapping_lastMappingResult";
-
- ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
- // Compare the provided array against the previous one
- array = array || [];
- options = options || {};
- var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
- var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
- var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
- var editScript = ko.utils.compareArrays(lastArray, array);
-
- // Build the new mapping result
- var newMappingResult = [];
- var lastMappingResultIndex = 0;
- var newMappingResultIndex = 0;
-
- var nodesToDelete = [];
- var itemsToProcess = [];
- var itemsForBeforeRemoveCallbacks = [];
- var itemsForMoveCallbacks = [];
- var itemsForAfterAddCallbacks = [];
- var mapData;
-
- function itemMovedOrRetained(editScriptIndex, oldPosition) {
- mapData = lastMappingResult[oldPosition];
- if (newMappingResultIndex !== oldPosition)
- itemsForMoveCallbacks[editScriptIndex] = mapData;
- // Since updating the index might change the nodes, do so before calling fixUpNodesToBeMovedOrRemoved
- mapData.indexObservable(newMappingResultIndex++);
- fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes);
- newMappingResult.push(mapData);
- itemsToProcess.push(mapData);
- }
-
- function callCallback(callback, items) {
- if (callback) {
- for (var i = 0, n = items.length; i < n; i++) {
- if (items[i]) {
- ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
- callback(node, i, items[i].arrayEntry);
- });
- }
- }
- }
- }
-
- for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
- movedIndex = editScriptItem['moved'];
- switch (editScriptItem['status']) {
- case "deleted":
- if (movedIndex === undefined) {
- mapData = lastMappingResult[lastMappingResultIndex];
-
- // Stop tracking changes to the mapping for these nodes
- if (mapData.dependentObservable)
- mapData.dependentObservable.dispose();
-
- // Queue these nodes for later removal
- nodesToDelete.push.apply(nodesToDelete, fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes));
- if (options['beforeRemove']) {
- itemsForBeforeRemoveCallbacks[i] = mapData;
- itemsToProcess.push(mapData);
- }
- }
- lastMappingResultIndex++;
- break;
-
- case "retained":
- itemMovedOrRetained(i, lastMappingResultIndex++);
- break;
-
- case "added":
- if (movedIndex !== undefined) {
- itemMovedOrRetained(i, movedIndex);
- } else {
- mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
- newMappingResult.push(mapData);
- itemsToProcess.push(mapData);
- if (!isFirstExecution)
- itemsForAfterAddCallbacks[i] = mapData;
- }
- break;
- }
- }
-
- // Call beforeMove first before any changes have been made to the DOM
- callCallback(options['beforeMove'], itemsForMoveCallbacks);
-
- // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
- for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
- // Get nodes for newly added items
- if (!mapData.mappedNodes)
- ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
-
- // Put nodes in the right place if they aren't there already
- for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
- if (node !== nextNode)
- ko.virtualElements.insertAfter(domNode, node, lastNode);
- }
-
- // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
- if (!mapData.initialized && callbackAfterAddingNodes) {
- callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
- mapData.initialized = true;
- }
- }
-
- // Next remove nodes for deleted items; or call beforeRemove, which will remove them
- ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
- callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
-
- // Finally call afterMove and afterAdd callbacks
- callCallback(options['afterMove'], itemsForMoveCallbacks);
- callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
-
- // Store a copy of the array items we just considered so we can difference it next time
- ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
- }
-})();
-
-ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
-ko.nativeTemplateEngine = function () {
- this['allowTemplateRewriting'] = false;
-}
-
-ko.nativeTemplateEngine.prototype = new ko.templateEngine();
-ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
- var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
- templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
- templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
-
- if (templateNodes) {
- return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
- } else {
- var templateText = templateSource['text']();
- return ko.utils.parseHtmlFragment(templateText);
- }
-};
-
-ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
-ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
-
-ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
-(function() {
- ko.jqueryTmplTemplateEngine = function () {
- // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
- // doesn't expose a version number, so we have to infer it.
- // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
- // which KO internally refers to as version "2", so older versions are no longer detected.
- var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
- if ((typeof(jQuery) == "undefined") || !(jQuery['tmpl']))
- return 0;
- // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
- try {
- if (jQuery['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
- // Since 1.0.0pre, custom tags should append markup to an array called "__"
- return 2; // Final version of jquery.tmpl
- }
- } catch(ex) { /* Apparently not the version we were looking for */ }
-
- return 1; // Any older version that we don't support
- })();
-
- function ensureHasReferencedJQueryTemplates() {
- if (jQueryTmplVersion < 2)
- throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
- }
-
- function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
- return jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
- }
-
- this['renderTemplateSource'] = function(templateSource, bindingContext, options) {
- options = options || {};
- ensureHasReferencedJQueryTemplates();
-
- // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
- var precompiled = templateSource['data']('precompiled');
- if (!precompiled) {
- var templateText = templateSource['text']() || "";
- // Wrap in "with($whatever.koBindingContext) { ... }"
- templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
-
- precompiled = jQuery['template'](null, templateText);
- templateSource['data']('precompiled', precompiled);
- }
-
- var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
- var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
-
- var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
- resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
-
- jQuery['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
- return resultNodes;
- };
-
- this['createJavaScriptEvaluatorBlock'] = function(script) {
- return "{{ko_code ((function() { return " + script + " })()) }}";
- };
-
- this['addTemplate'] = function(templateName, templateMarkup) {
- document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "</script>");
- };
-
- if (jQueryTmplVersion > 0) {
- jQuery['tmpl']['tag']['ko_code'] = {
- open: "__.push($1 || '');"
- };
- jQuery['tmpl']['tag']['ko_with'] = {
- open: "with($1) {",
- close: "} "
- };
- }
- };
-
- ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
-
- // Use this one by default *only if jquery.tmpl is referenced*
- var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
- if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
- ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
-
- ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
-})();
-});
-})(window,document,navigator,window["jQuery"]);
-})();
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