zrcadlo
https://github.com/nextcloud/server.git
synchronizováno 2024-08-30 17:57:26 +02:00
460 řádky
19 KiB
JavaScript
460 řádky
19 KiB
JavaScript
/*
|
|
* The MIT License
|
|
*
|
|
* Copyright (c) 2012 James Allardice
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
// Defines the global Placeholders object along with various utility methods
|
|
(function (global) {
|
|
|
|
"use strict";
|
|
|
|
// Cross-browser DOM event binding
|
|
function addEventListener(elem, event, fn) {
|
|
if (elem.addEventListener) {
|
|
return elem.addEventListener(event, fn, false);
|
|
}
|
|
if (elem.attachEvent) {
|
|
return elem.attachEvent("on" + event, fn);
|
|
}
|
|
}
|
|
|
|
// Check whether an item is in an array (we don't use Array.prototype.indexOf so we don't clobber any existing polyfills - this is a really simple alternative)
|
|
function inArray(arr, item) {
|
|
var i, len;
|
|
for (i = 0, len = arr.length; i < len; i++) {
|
|
if (arr[i] === item) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Move the caret to the index position specified. Assumes that the element has focus
|
|
function moveCaret(elem, index) {
|
|
var range;
|
|
if (elem.createTextRange) {
|
|
range = elem.createTextRange();
|
|
range.move("character", index);
|
|
range.select();
|
|
} else if (elem.selectionStart) {
|
|
elem.focus();
|
|
elem.setSelectionRange(index, index);
|
|
}
|
|
}
|
|
|
|
// Attempt to change the type property of an input element
|
|
function changeType(elem, type) {
|
|
try {
|
|
elem.type = type;
|
|
return true;
|
|
} catch (e) {
|
|
// You can't change input type in IE8 and below
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Expose public methods
|
|
global.Placeholders = {
|
|
Utils: {
|
|
addEventListener: addEventListener,
|
|
inArray: inArray,
|
|
moveCaret: moveCaret,
|
|
changeType: changeType
|
|
}
|
|
};
|
|
|
|
}(this));
|
|
|
|
(function (global) {
|
|
|
|
"use strict";
|
|
|
|
var validTypes = [
|
|
"text",
|
|
"search",
|
|
"url",
|
|
"tel",
|
|
"email",
|
|
"password",
|
|
"number",
|
|
"textarea"
|
|
],
|
|
|
|
// The list of keycodes that are not allowed when the polyfill is configured to hide-on-input
|
|
badKeys = [
|
|
|
|
// The following keys all cause the caret to jump to the end of the input value
|
|
27, // Escape
|
|
33, // Page up
|
|
34, // Page down
|
|
35, // End
|
|
36, // Home
|
|
|
|
// Arrow keys allow you to move the caret manually, which should be prevented when the placeholder is visible
|
|
37, // Left
|
|
38, // Up
|
|
39, // Right
|
|
40, // Down
|
|
|
|
// The following keys allow you to modify the placeholder text by removing characters, which should be prevented when the placeholder is visible
|
|
8, // Backspace
|
|
46 // Delete
|
|
],
|
|
|
|
// Styling variables
|
|
placeholderStyleColor = "#ccc",
|
|
placeholderClassName = "placeholdersjs",
|
|
classNameRegExp = new RegExp("(?:^|\\s)" + placeholderClassName + "(?!\\S)"),
|
|
|
|
// These will hold references to all elements that can be affected. NodeList objects are live, so we only need to get those references once
|
|
inputs, textareas,
|
|
|
|
// The various data-* attributes used by the polyfill
|
|
ATTR_CURRENT_VAL = "data-placeholder-value",
|
|
ATTR_ACTIVE = "data-placeholder-active",
|
|
ATTR_INPUT_TYPE = "data-placeholder-type",
|
|
ATTR_FORM_HANDLED = "data-placeholder-submit",
|
|
ATTR_EVENTS_BOUND = "data-placeholder-bound",
|
|
ATTR_OPTION_FOCUS = "data-placeholder-focus",
|
|
ATTR_OPTION_LIVE = "data-placeholder-live",
|
|
ATTR_MAXLENGTH = "data-placeholder-maxlength",
|
|
|
|
// Various other variables used throughout the rest of the script
|
|
test = document.createElement("input"),
|
|
head = document.getElementsByTagName("head")[0],
|
|
root = document.documentElement,
|
|
Placeholders = global.Placeholders,
|
|
Utils = Placeholders.Utils,
|
|
hideOnInput, liveUpdates, keydownVal, styleElem, styleRules, placeholder, timer, form, elem, len, i;
|
|
|
|
// No-op (used in place of public methods when native support is detected)
|
|
function noop() {}
|
|
|
|
// Avoid IE9 activeElement of death when an iframe is used.
|
|
// More info:
|
|
// http://bugs.jquery.com/ticket/13393
|
|
// https://github.com/jquery/jquery/commit/85fc5878b3c6af73f42d61eedf73013e7faae408
|
|
function safeActiveElement() {
|
|
try {
|
|
return document.activeElement;
|
|
} catch (err) {}
|
|
}
|
|
|
|
// Hide the placeholder value on a single element. Returns true if the placeholder was hidden and false if it was not (because it wasn't visible in the first place)
|
|
function hidePlaceholder(elem, keydownValue) {
|
|
var type,
|
|
maxLength,
|
|
valueChanged = (!!keydownValue && elem.value !== keydownValue),
|
|
isPlaceholderValue = (elem.value === elem.getAttribute(ATTR_CURRENT_VAL));
|
|
|
|
if ((valueChanged || isPlaceholderValue) && elem.getAttribute(ATTR_ACTIVE) === "true") {
|
|
elem.removeAttribute(ATTR_ACTIVE);
|
|
elem.value = elem.value.replace(elem.getAttribute(ATTR_CURRENT_VAL), "");
|
|
elem.className = elem.className.replace(classNameRegExp, "");
|
|
|
|
// Restore the maxlength value
|
|
maxLength = elem.getAttribute(ATTR_MAXLENGTH);
|
|
if (parseInt(maxLength, 10) >= 0) { // Old FF returns -1 if attribute not set (see GH-56)
|
|
elem.setAttribute("maxLength", maxLength);
|
|
elem.removeAttribute(ATTR_MAXLENGTH);
|
|
}
|
|
|
|
// If the polyfill has changed the type of the element we need to change it back
|
|
type = elem.getAttribute(ATTR_INPUT_TYPE);
|
|
if (type) {
|
|
elem.type = type;
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Show the placeholder value on a single element. Returns true if the placeholder was shown and false if it was not (because it was already visible)
|
|
function showPlaceholder(elem) {
|
|
var type,
|
|
maxLength,
|
|
val = elem.getAttribute(ATTR_CURRENT_VAL);
|
|
if (elem.value === "" && val) {
|
|
elem.setAttribute(ATTR_ACTIVE, "true");
|
|
elem.value = val;
|
|
elem.className += " " + placeholderClassName;
|
|
|
|
// Store and remove the maxlength value
|
|
maxLength = elem.getAttribute(ATTR_MAXLENGTH);
|
|
if (!maxLength) {
|
|
elem.setAttribute(ATTR_MAXLENGTH, elem.maxLength);
|
|
elem.removeAttribute("maxLength");
|
|
}
|
|
|
|
// If the type of element needs to change, change it (e.g. password inputs)
|
|
type = elem.getAttribute(ATTR_INPUT_TYPE);
|
|
if (type) {
|
|
elem.type = "text";
|
|
} else if (elem.type === "password") {
|
|
if (Utils.changeType(elem, "text")) {
|
|
elem.setAttribute(ATTR_INPUT_TYPE, "password");
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function handleElem(node, callback) {
|
|
|
|
var handleInputsLength, handleTextareasLength, handleInputs, handleTextareas, elem, len, i;
|
|
|
|
// Check if the passed in node is an input/textarea (in which case it can't have any affected descendants)
|
|
if (node && node.getAttribute(ATTR_CURRENT_VAL)) {
|
|
callback(node);
|
|
} else {
|
|
|
|
// If an element was passed in, get all affected descendants. Otherwise, get all affected elements in document
|
|
handleInputs = node ? node.getElementsByTagName("input") : inputs;
|
|
handleTextareas = node ? node.getElementsByTagName("textarea") : textareas;
|
|
|
|
handleInputsLength = handleInputs ? handleInputs.length : 0;
|
|
handleTextareasLength = handleTextareas ? handleTextareas.length : 0;
|
|
|
|
// Run the callback for each element
|
|
for (i = 0, len = handleInputsLength + handleTextareasLength; i < len; i++) {
|
|
elem = i < handleInputsLength ? handleInputs[i] : handleTextareas[i - handleInputsLength];
|
|
callback(elem);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Return all affected elements to their normal state (remove placeholder value if present)
|
|
function disablePlaceholders(node) {
|
|
handleElem(node, hidePlaceholder);
|
|
}
|
|
|
|
// Show the placeholder value on all appropriate elements
|
|
function enablePlaceholders(node) {
|
|
handleElem(node, showPlaceholder);
|
|
}
|
|
|
|
// Returns a function that is used as a focus event handler
|
|
function makeFocusHandler(elem) {
|
|
return function () {
|
|
|
|
// Only hide the placeholder value if the (default) hide-on-focus behaviour is enabled
|
|
if (hideOnInput && elem.value === elem.getAttribute(ATTR_CURRENT_VAL) && elem.getAttribute(ATTR_ACTIVE) === "true") {
|
|
|
|
// Move the caret to the start of the input (this mimics the behaviour of all browsers that do not hide the placeholder on focus)
|
|
Utils.moveCaret(elem, 0);
|
|
|
|
} else {
|
|
|
|
// Remove the placeholder
|
|
hidePlaceholder(elem);
|
|
}
|
|
};
|
|
}
|
|
|
|
// Returns a function that is used as a blur event handler
|
|
function makeBlurHandler(elem) {
|
|
return function () {
|
|
showPlaceholder(elem);
|
|
};
|
|
}
|
|
|
|
// Functions that are used as a event handlers when the hide-on-input behaviour has been activated - very basic implementation of the "input" event
|
|
function makeKeydownHandler(elem) {
|
|
return function (e) {
|
|
keydownVal = elem.value;
|
|
|
|
//Prevent the use of the arrow keys (try to keep the cursor before the placeholder)
|
|
if (elem.getAttribute(ATTR_ACTIVE) === "true") {
|
|
if (keydownVal === elem.getAttribute(ATTR_CURRENT_VAL) && Utils.inArray(badKeys, e.keyCode)) {
|
|
if (e.preventDefault) {
|
|
e.preventDefault();
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
};
|
|
}
|
|
function makeKeyupHandler(elem) {
|
|
return function () {
|
|
hidePlaceholder(elem, keydownVal);
|
|
|
|
// If the element is now empty we need to show the placeholder
|
|
if (elem.value === "") {
|
|
elem.blur();
|
|
Utils.moveCaret(elem, 0);
|
|
}
|
|
};
|
|
}
|
|
function makeClickHandler(elem) {
|
|
return function () {
|
|
if (elem === safeActiveElement() && elem.value === elem.getAttribute(ATTR_CURRENT_VAL) && elem.getAttribute(ATTR_ACTIVE) === "true") {
|
|
Utils.moveCaret(elem, 0);
|
|
}
|
|
};
|
|
}
|
|
|
|
// Returns a function that is used as a submit event handler on form elements that have children affected by this polyfill
|
|
function makeSubmitHandler(form) {
|
|
return function () {
|
|
|
|
// Turn off placeholders on all appropriate descendant elements
|
|
disablePlaceholders(form);
|
|
};
|
|
}
|
|
|
|
// Bind event handlers to an element that we need to affect with the polyfill
|
|
function newElement(elem) {
|
|
|
|
// If the element is part of a form, make sure the placeholder string is not submitted as a value
|
|
if (elem.form) {
|
|
form = elem.form;
|
|
|
|
// If the type of the property is a string then we have a "form" attribute and need to get the real form
|
|
if (typeof form === "string") {
|
|
form = document.getElementById(form);
|
|
}
|
|
|
|
// Set a flag on the form so we know it's been handled (forms can contain multiple inputs)
|
|
if (!form.getAttribute(ATTR_FORM_HANDLED)) {
|
|
Utils.addEventListener(form, "submit", makeSubmitHandler(form));
|
|
form.setAttribute(ATTR_FORM_HANDLED, "true");
|
|
}
|
|
}
|
|
|
|
// Bind event handlers to the element so we can hide/show the placeholder as appropriate
|
|
Utils.addEventListener(elem, "focus", makeFocusHandler(elem));
|
|
Utils.addEventListener(elem, "blur", makeBlurHandler(elem));
|
|
|
|
// If the placeholder should hide on input rather than on focus we need additional event handlers
|
|
if (hideOnInput) {
|
|
Utils.addEventListener(elem, "keydown", makeKeydownHandler(elem));
|
|
Utils.addEventListener(elem, "keyup", makeKeyupHandler(elem));
|
|
Utils.addEventListener(elem, "click", makeClickHandler(elem));
|
|
}
|
|
|
|
// Remember that we've bound event handlers to this element
|
|
elem.setAttribute(ATTR_EVENTS_BOUND, "true");
|
|
elem.setAttribute(ATTR_CURRENT_VAL, placeholder);
|
|
|
|
// If the element doesn't have a value and is not focussed, set it to the placeholder string
|
|
if (hideOnInput || elem !== safeActiveElement()) {
|
|
showPlaceholder(elem);
|
|
}
|
|
}
|
|
|
|
Placeholders.nativeSupport = test.placeholder !== void 0;
|
|
|
|
if (!Placeholders.nativeSupport) {
|
|
|
|
// Get references to all the input and textarea elements currently in the DOM (live NodeList objects to we only need to do this once)
|
|
inputs = document.getElementsByTagName("input");
|
|
textareas = document.getElementsByTagName("textarea");
|
|
|
|
// Get any settings declared as data-* attributes on the root element (currently the only options are whether to hide the placeholder on focus or input and whether to auto-update)
|
|
hideOnInput = root.getAttribute(ATTR_OPTION_FOCUS) === "false";
|
|
liveUpdates = root.getAttribute(ATTR_OPTION_LIVE) !== "false";
|
|
|
|
// Create style element for placeholder styles (instead of directly setting style properties on elements - allows for better flexibility alongside user-defined styles)
|
|
styleElem = document.createElement("style");
|
|
styleElem.type = "text/css";
|
|
|
|
// Create style rules as text node
|
|
styleRules = document.createTextNode("." + placeholderClassName + " { color:" + placeholderStyleColor + "; }");
|
|
|
|
// Append style rules to newly created stylesheet
|
|
if (styleElem.styleSheet) {
|
|
styleElem.styleSheet.cssText = styleRules.nodeValue;
|
|
} else {
|
|
styleElem.appendChild(styleRules);
|
|
}
|
|
|
|
// Prepend new style element to the head (before any existing stylesheets, so user-defined rules take precedence)
|
|
head.insertBefore(styleElem, head.firstChild);
|
|
|
|
// Set up the placeholders
|
|
for (i = 0, len = inputs.length + textareas.length; i < len; i++) {
|
|
elem = i < inputs.length ? inputs[i] : textareas[i - inputs.length];
|
|
|
|
// Get the value of the placeholder attribute, if any. IE10 emulating IE7 fails with getAttribute, hence the use of the attributes node
|
|
placeholder = elem.attributes.placeholder;
|
|
if (placeholder) {
|
|
|
|
// IE returns an empty object instead of undefined if the attribute is not present
|
|
placeholder = placeholder.nodeValue;
|
|
|
|
// Only apply the polyfill if this element is of a type that supports placeholders, and has a placeholder attribute with a non-empty value
|
|
if (placeholder && Utils.inArray(validTypes, elem.type)) {
|
|
newElement(elem);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If enabled, the polyfill will repeatedly check for changed/added elements and apply to those as well
|
|
timer = setInterval(function () {
|
|
for (i = 0, len = inputs.length + textareas.length; i < len; i++) {
|
|
elem = i < inputs.length ? inputs[i] : textareas[i - inputs.length];
|
|
|
|
// Only apply the polyfill if this element is of a type that supports placeholders, and has a placeholder attribute with a non-empty value
|
|
placeholder = elem.attributes.placeholder;
|
|
if (placeholder) {
|
|
placeholder = placeholder.nodeValue;
|
|
if (placeholder && Utils.inArray(validTypes, elem.type)) {
|
|
|
|
// If the element hasn't had event handlers bound to it then add them
|
|
if (!elem.getAttribute(ATTR_EVENTS_BOUND)) {
|
|
newElement(elem);
|
|
}
|
|
|
|
// If the placeholder value has changed or not been initialised yet we need to update the display
|
|
if (placeholder !== elem.getAttribute(ATTR_CURRENT_VAL) || (elem.type === "password" && !elem.getAttribute(ATTR_INPUT_TYPE))) {
|
|
|
|
// Attempt to change the type of password inputs (fails in IE < 9)
|
|
if (elem.type === "password" && !elem.getAttribute(ATTR_INPUT_TYPE) && Utils.changeType(elem, "text")) {
|
|
elem.setAttribute(ATTR_INPUT_TYPE, "password");
|
|
}
|
|
|
|
// If the placeholder value has changed and the placeholder is currently on display we need to change it
|
|
if (elem.value === elem.getAttribute(ATTR_CURRENT_VAL)) {
|
|
elem.value = placeholder;
|
|
}
|
|
|
|
// Keep a reference to the current placeholder value in case it changes via another script
|
|
elem.setAttribute(ATTR_CURRENT_VAL, placeholder);
|
|
}
|
|
}
|
|
} else if (elem.getAttribute(ATTR_ACTIVE)) {
|
|
hidePlaceholder(elem);
|
|
elem.removeAttribute(ATTR_CURRENT_VAL);
|
|
}
|
|
}
|
|
|
|
// If live updates are not enabled cancel the timer
|
|
if (!liveUpdates) {
|
|
clearInterval(timer);
|
|
}
|
|
}, 100);
|
|
}
|
|
|
|
Utils.addEventListener(global, "beforeunload", function () {
|
|
Placeholders.disable();
|
|
});
|
|
|
|
// Expose public methods
|
|
Placeholders.disable = Placeholders.nativeSupport ? noop : disablePlaceholders;
|
|
Placeholders.enable = Placeholders.nativeSupport ? noop : enablePlaceholders;
|
|
|
|
}(this));
|