Multiple comment submissions for a diff is prevented now.

Summary:
It was possible to submit a comment multiple times if the submit
button was pressed more than once quickly. Added javascript code
that disables the button when it is clicked.

Test Plan:
Tried to click the button multiple times very quickly, but the
button was disabled after the first click.

Reviewed By: epriestley
Reviewers: epriestley, jungejason
Commenters: aran
CC: aran, epriestley, tuomaspelkonen
Differential Revision: 337

src/__celerity_resource_map__.php

@@ -284,6 +284,18 @@ celerity_register_resource_map(array(
     ),
     'disk' => '/rsrc/js/application/core/behavior-tokenizer.js',
   ),
+  'javelin-behavior-aphront-form-disable-on-submit' =>
+  array(
+    'uri' => '/res/6c659ede/rsrc/js/application/core/behavior-form.js',
+    'type' => 'js',
+    'requires' =>
+    array(
+      0 => 'javelin-behavior',
+      1 => 'javelin-stratcom',
+      2 => 'javelin-dom',
+    ),
+    'disk' => '/rsrc/js/application/core/behavior-form.js',
+  ),
   'javelin-behavior-dark-console' =>
   array(
     'uri' => '/res/044c171f/rsrc/js/application/core/behavior-dark-console.js',

src/view/form/base/AphrontFormView.php

@@ -64,6 +64,11 @@ final class AphrontFormView extends AphrontView {
 
   public function render() {
     require_celerity_resource('aphront-form-view-css');
+
+    Javelin::initBehavior(
+      'aphront-form-disable-on-submit',
+      array());
+
     return javelin_render_tag(
       'form',
       array(

src/view/form/base/__init__.php

@@ -7,6 +7,7 @@
 
 
 phutil_require_module('phabricator', 'infrastructure/celerity/api');
+phutil_require_module('phabricator', 'infrastructure/javelin/api');
 phutil_require_module('phabricator', 'infrastructure/javelin/markup');
 phutil_require_module('phabricator', 'view/base');
 

webroot/rsrc/js/application/core/behavior-form.js

@@ -0,0 +1,48 @@
+/**
+ * @requires javelin-behavior javelin-stratcom javelin-dom
+ * @provides javelin-behavior-aphront-form-disable-on-submit
+ */
+
+JX.behavior('aphront-form-disable-on-submit', function(config) {
+
+  var restore = [];
+  var root = null;
+
+  JX.Stratcom.listen('submit', 'tag:form', function(e) {
+    if (e.getNode('workflow')) {
+      // Don't activate for forms with workflow, the workflow behavior will
+      // handle it.
+      return;
+    }
+
+    root = e.getNode('tag:form');
+    if (root._disabled) {
+      e.kill();
+    }
+    root._disabled = true;
+    var buttons = JX.DOM.scry(root, 'button');
+    for (var ii = 0; ii < buttons.length; ii++) {
+      if (!buttons[ii].disabled) {
+        buttons[ii].disabled = 'disabled';
+        JX.DOM.alterClass(buttons[ii], 'disabled', true);
+        restore.push(buttons[ii]);
+      }
+    }
+  });
+
+  JX.Stratcom.listen('unload', null, function(e) {
+    // Reenable everything on page unload so we don't bfcache back to a page
+    // that has disabled forms.
+    for (var ii = 0; ii < restore.length; ii++) {
+      restore[ii].disabled = '';
+      JX.DOM.alterClass(restore[ii], 'disabled', false);
+      root._disabled = false;
+    }
+    if (root) {
+      delete root._disabled;
+    }
+    restore = [];
+    root = null;
+  });
+
+});