1 files changed, 202 insertions, 0 deletions
diff --git a/public/javascripts/rails.js b/public/javascripts/rails.js
new file mode 100644
index 000000000..88eac6e45
--- /dev/null
+++ b/public/javascripts/rails.js
@@ -0,0 +1,202 @@
+(function() {
+  Ajax.Responders.register({
+    onCreate: function(request) {
+      var token = $$('meta[name=csrf-token]')[0];
+      if (token) {
+        if (!request.options.requestHeaders) request.options.requestHeaders = {};
+        request.options.requestHeaders['X-CSRF-Token'] = token.readAttribute('content');
+      }
+    }
+  });
+
+  // Technique from Juriy Zaytsev
+  // http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
+  function isEventSupported(eventName) {
+    var el = document.createElement('div');
+    eventName = 'on' + eventName;
+    var isSupported = (eventName in el);
+    if (!isSupported) {
+      el.setAttribute(eventName, 'return;');
+      isSupported = typeof el[eventName] == 'function';
+    }
+    el = null;
+    return isSupported;
+  }
+
+  function isForm(element) {
+    return Object.isElement(element) && element.nodeName.toUpperCase() == 'FORM';
+  }
+
+  function isInput(element) {
+    if (Object.isElement(element)) {
+      var name = element.nodeName.toUpperCase();
+      return name == 'INPUT' || name == 'SELECT' || name == 'TEXTAREA';
+    }
+    else return false;
+  }
+
+  var submitBubbles = isEventSupported('submit'),
+      changeBubbles = isEventSupported('change');
+
+  if (!submitBubbles || !changeBubbles) {
+    // augment the Event.Handler class to observe custom events when needed
+    Event.Handler.prototype.initialize = Event.Handler.prototype.initialize.wrap(
+      function(init, element, eventName, selector, callback) {
+        init(element, eventName, selector, callback);
+        // is the handler being attached to an element that doesn't support this event?
+        if ( (!submitBubbles && this.eventName == 'submit' && !isForm(this.element)) ||
+             (!changeBubbles && this.eventName == 'change' && !isInput(this.element)) ) {
+          // "submit" => "emulated:submit"
+          this.eventName = 'emulated:' + this.eventName;
+        }
+      }
+    );
+  }
+
+  if (!submitBubbles) {
+    // discover forms on the page by observing focus events which always bubble
+    document.on('focusin', 'form', function(focusEvent, form) {
+      // special handler for the real "submit" event (one-time operation)
+      if (!form.retrieve('emulated:submit')) {
+        form.on('submit', function(submitEvent) {
+          var emulated = form.fire('emulated:submit', submitEvent, true);
+          // if custom event received preventDefault, cancel the real one too
+          if (emulated.returnValue === false) submitEvent.preventDefault();
+        });
+        form.store('emulated:submit', true);
+      }
+    });
+  }
+
+  if (!changeBubbles) {
+    // discover form inputs on the page
+    document.on('focusin', 'input, select, textarea', function(focusEvent, input) {
+      // special handler for real "change" events
+      if (!input.retrieve('emulated:change')) {
+        input.on('change', function(changeEvent) {
+          input.fire('emulated:change', changeEvent, true);
+        });
+        input.store('emulated:change', true);
+      }
+    });
+  }
+
+  function handleRemote(element) {
+    var method, url, params;
+
+    var event = element.fire("ajax:before");
+    if (event.stopped) return false;
+
+    if (element.tagName.toLowerCase() === 'form') {
+      method = element.readAttribute('method') || 'post';
+      url    = element.readAttribute('action');
+      // serialize the form with respect to the submit button that was pressed
+      params = element.serialize({ submit: element.retrieve('rails:submit-button') });
+      // clear the pressed submit button information
+      element.store('rails:submit-button', null);
+    } else {
+      method = element.readAttribute('data-method') || 'get';
+      url    = element.readAttribute('href');
+      params = {};
+    }
+
+    new Ajax.Request(url, {
+      method: method,
+      parameters: params,
+      evalScripts: true,
+
+      onCreate:   function(response) { element.fire("ajax:create",   response); },
+      onComplete: function(response) { element.fire("ajax:complete", response); },
+      onSuccess:  function(response) { element.fire("ajax:success",  response); },
+      onFailure:  function(response) { element.fire("ajax:failure",  response); }
+    });
+
+    element.fire("ajax:after");
+  }
+
+  function insertHiddenField(form, name, value) {
+    form.insert(new Element('input', { type: 'hidden', name: name, value: value }));
+  }
+
+  function handleMethod(element) {
+    var method = element.readAttribute('data-method'),
+        url = element.readAttribute('href'),
+        csrf_param = $$('meta[name=csrf-param]')[0],
+        csrf_token = $$('meta[name=csrf-token]')[0];
+
+    var form = new Element('form', { method: "POST", action: url, style: "display: none;" });
+    $(element.parentNode).insert(form);
+
+    if (method !== 'post') {
+      insertHiddenField(form, '_method', method);
+    }
+
+    if (csrf_param) {
+      insertHiddenField(form, csrf_param.readAttribute('content'), csrf_token.readAttribute('content'));
+    }
+
+    form.submit();
+  }
+
+  function disableFormElements(form) {
+    form.select('input[type=submit][data-disable-with]').each(function(input) {
+      input.store('rails:original-value', input.getValue());
+      input.setValue(input.readAttribute('data-disable-with')).disable();
+    });
+  }
+  
+  function enableFormElements(form) {
+    form.select('input[type=submit][data-disable-with]').each(function(input) {
+      input.setValue(input.retrieve('rails:original-value')).enable();
+    });
+  }
+
+  function allowAction(element) {
+    var message = element.readAttribute('data-confirm');
+    return !message || confirm(message);
+  }
+
+  document.on('click', 'a[data-confirm], a[data-remote], a[data-method]', function(event, link) {
+    if (!allowAction(link)) {
+      event.stop();
+      return false;
+    }
+
+    if (link.readAttribute('data-remote')) {
+      handleRemote(link);
+      event.stop();
+    } else if (link.readAttribute('data-method')) {
+      handleMethod(link);
+      event.stop();
+    }
+  });
+
+  document.on("click", "form input[type=submit], form button[type=submit], form button:not([type])", function(event, button) {
+    // register the pressed submit button
+    event.findElement('form').store('rails:submit-button', button.name || false);
+  });
+
+  document.on("submit", function(event) {
+    var form = event.findElement();
+
+    if (!allowAction(form)) {
+      event.stop();
+      return false;
+    }
+
+    if (form.readAttribute('data-remote')) {
+      handleRemote(form);
+      event.stop();
+    } else {
+      disableFormElements(form);
+    }
+  });
+
+  document.on('ajax:create', 'form', function(event, form) {
+    if (form == event.findElement()) disableFormElements(form);
+  });
+  
+  document.on('ajax:complete', 'form', function(event, form) {
+    if (form == event.findElement()) enableFormElements(form);
+  });
+})();