Update to latest rails.js

[#4411 state:resolved]

1 files changed, 114 insertions, 57 deletions

diff --git a/railties/lib/rails/generators/rails/app/templates/public/javascripts/rails.js b/railties/lib/rails/generators/rails/app/templates/public/javascripts/rails.js
index c5fa02ae35..4283ed8982 100644
--- a/railties/lib/rails/generators/rails/app/templates/public/javascripts/rails.js
+++ b/railties/lib/rails/generators/rails/app/templates/public/javascripts/rails.js
@@ -1,87 +1,148 @@
-document.observe("dom:loaded", function() {
+(function() {
+  // 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, texarea', 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');
-      params = element.serialize(true);
+      params = element.serialize();
     } else {
       method = element.readAttribute('data-method') || 'get';
       url    = element.readAttribute('href');
       params = {};
     }
 
-    var event = element.fire("ajax:before");
-    if (event.stopped) return false;
-
     new Ajax.Request(url, {
       method: method,
       parameters: params,
-      asynchronous: true,
       evalScripts: true,
 
-      onLoading:     function(request) { element.fire("ajax:loading", {request: request}); },
-      onLoaded:      function(request) { element.fire("ajax:loaded", {request: request}); },
-      onInteractive: function(request) { element.fire("ajax:interactive", {request: request}); },
-      onComplete:    function(request) { element.fire("ajax:complete", {request: request}); },
-      onSuccess:     function(request) { element.fire("ajax:success", {request: request}); },
-      onFailure:     function(request) { element.fire("ajax:failure", {request: request}); }
+      onComplete:    function(request) { element.fire("ajax:complete", request); },
+      onSuccess:     function(request) { element.fire("ajax:success",  request); },
+      onFailure:     function(request) { element.fire("ajax:failure",  request); }
     });
 
     element.fire("ajax:after");
   }
 
   function handleMethod(element) {
-    var method, url, token_name, token;
-
-    method     = element.readAttribute('data-method');
-    url        = element.readAttribute('href');
-    csrf_param = $$('meta[name=csrf-param]').first();
-    csrf_token = $$('meta[name=csrf-token]').first();
+    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.appendChild(form);
+    element.parentNode.insert(form);
 
-    if (method != 'post') {
+    if (method !== 'post') {
       var field = new Element('input', { type: 'hidden', name: '_method', value: method });
-      form.appendChild(field);
+      form.insert(field);
     }
 
     if (csrf_param) {
-      var param = csrf_param.readAttribute('content');
-      var token = csrf_token.readAttribute('content');
-      var field = new Element('input', { type: 'hidden', name: param, value: token });
-      form.appendChild(field);
+      var param = csrf_param.readAttribute('content'),
+          token = csrf_token.readAttribute('content'),
+          field = new Element('input', { type: 'hidden', name: param, value: token });
+      form.insert(field);
     }
 
     form.submit();
   }
 
-  $(document.body).observe("click", function(event) {
-    var message = event.findElement().readAttribute('data-confirm');
-    if (message && !confirm(message)) {
-      event.stop();
-      return false;
-    }
 
-    var element = event.findElement("a[data-remote]");
-    if (element) {
-      handleRemote(element);
-      event.stop();
-      return true;
-    }
+  document.on("click", "*[data-confirm]", function(event, element) {
+    var message = element.readAttribute('data-confirm');
+    if (!confirm(message)) event.stop();
+  });
 
-    var element = event.findElement("a[data-method]");
-    if (element) {
-      handleMethod(element);
-      event.stop();
-      return true;
-    }
+  document.on("click", "a[data-remote]", function(event, element) {
+    if (event.stopped) return;
+    handleRemote(element);
+    event.stop();
+  });
+
+  document.on("click", "a[data-method]", function(event, element) {
+    if (event.stopped) return;
+    handleMethod(element);
+    event.stop();
   });
 
-  // TODO: I don't think submit bubbles in IE
-  $(document.body).observe("submit", function(event) {
+  document.on("submit", function(event) {
     var element = event.findElement(),
         message = element.readAttribute('data-confirm');
     if (message && !confirm(message)) {
@@ -103,16 +164,12 @@ document.observe("dom:loaded", function() {
     }
   });
 
-  $(document.body).observe("ajax:after", function(event) {
-    var element = event.findElement();
-
-    if (element.tagName.toLowerCase() === 'form') {
-      var inputs = element.select("input[type=submit][disabled=true][data-disable-with]");
-      inputs.each(function(input) {
-        input.value = input.readAttribute('data-original-value');
-        input.writeAttribute('data-original-value', null);
-        input.disabled = false;
-      });
-    }
+  document.on("ajax:after", "form", function(event, element) {
+    var inputs = element.select("input[type=submit][disabled=true][data-disable-with]");
+    inputs.each(function(input) {
+      input.value = input.readAttribute('data-original-value');
+      input.removeAttribute('data-original-value');
+      input.disabled = false;
+    });
   });
-});
\ No newline at end of file
+})();