prevents double submit for form buttons

app/assets/javascripts/application.js

@@ -33,6 +33,7 @@ var initialize_modules = function() {
   App.Dropdown.initialize();
   App.LocationChanger.initialize();
   App.CheckAllNone.initialize();
+  App.PreventDoubleSubmission.initialize();
 };
 
 $(function(){

app/assets/javascripts/prevent_double_submission.js.coffee

@@ -0,0 +1,28 @@
+App.PreventDoubleSubmission =
+  disable_button: (button) ->
+    unless button.hasClass('disabled')
+      loading = button.data('loading') ? 'Sending ...'
+      button.addClass('disabled').attr('disabled', 'disabled')
+      button.data('text', button.val())
+      button.val(loading)
+
+  reset_button: (button) ->
+    if button.hasClass('disabled')
+      button_text = button.data('text')
+      button.removeClass('disabled').attr('disabled', null)
+      if button_text
+        button.val(button_text)
+        button.data('text', null)
+
+  initialize: ->
+    $('form').on('submit', event, ->
+      $form = $(this)
+      button = $form.find('.button')
+      App.PreventDoubleSubmission.disable_button(button)
+    ).on('ajax:success', ->
+      $form = $(this)
+      button = $form.find('.button')
+      App.PreventDoubleSubmission.reset_button(button)
+    )
+
+    false