iframe_view.js.coffee in locomotivecms-3.1.0.rc1

- old
+ new

@@ -15,10 +15,12 @@
 
   reload: ->
     $(@el).attr('src', @preview_url)
 
   on_load: (event) ->
+    @register_beforeunload()
+
     # Able to get the path to the edit form?
     if (path = @edit_view_path())?
       @preview_url = @window.document.location.href
 
       if !@startup
@@ -50,9 +52,17 @@
         edit: $(@el).data('edit-label')
     @page_view.render()
 
     # insert the highlighter CSS (path to the CSS in the iframe data)
     window.addStylesheet(@window.document, $(@el).data('style-path'))
+
+  register_beforeunload: ->
+    $(@window).off  'beforeunload', @warn_if_unsaved_content
+    $(@window).on   'beforeunload', @warn_if_unsaved_content
+
+  warn_if_unsaved_content: ->
+    if window.unsaved_content
+      return $('meta[name=unsaved-content-warning]').attr('content')
 
   remove: ->
     super()
     @page_view.remove() if @page_view?
     _.each @tokens, (token) -> PubSub.unsubscribe(token)