in design,after online editing,return json url,callback not finish

app/assets/javascripts/design_temp.js

@@ -6,6 +6,7 @@ function r_editor(tgetUrl,tpostUrl,tfilename,toption){
   editor.filename = tfilename;
   editor.getUrl = tgetUrl;
   editor.postUrl = tpostUrl;
+  editor.nodeToBeChanged=""
   editor.width = toption['width'];
   editor.height = toption['height'];
   var html='';
@@ -27,7 +28,12 @@ function r_editor(tgetUrl,tpostUrl,tfilename,toption){
     });
   };
   editor.send = function(){
-    $.post(editor.postUrl,{filename:editor.filename,context:html.children("textarea").val(),authenticity_token:$('meta[name=csrf-token]').attr('content')});
+    callback_for_send = function(data){
+      editor.postUrl = data;
+      alert($(this).attr("path"));
+    };
+    $.post(editor.postUrl,{filename:editor.filename,context:html.children("textarea").val(),authenticity_token:$('meta[name=csrf-token]').attr('content')},callback_for_send,"json");
+  
   };
   editor.destroy = function(){
     html.remove();