为什么Rails UJS是ajax：成功绑定被调用两次？

I have a simple form:

我有一个简单的形式：

= form_for(posts_path, :id => "new_post", :remote => true) do
  = text_field_tag "post[input]"
  = submit_tag "Post!"

I have bound a callback to the ajax:success event:

我绑定了一个回调ajax：success事件：

$("form#new_post").bind("ajax:success", function(xhr, data, status){
  alert("Post Created!");
});

When I click the Post! button, the Post Created comes up twice. Why?

当我点击帖子！按钮，Post Created出现两次。为什么？

I'm using Rails 3.1 which by default is using jquery-ujs.

我正在使用Rails 3.1，默认情况下使用的是jquery-ujs。

3 个解决方案

#1

That is because your page is loading jquery_ujs code twice in development mode when precompiled assets exist in /public/assets.

这是因为当/ public / assets中存在预编译资产时，您的页面在开发模式下两次加载jquery_ujs代码。

In development mode javascript requries are loaded with separate tags: jquery, jquery_ujs.js, myscripts.js and finally applications.js. The problem happens when precompiled application.js exists and is used from /public/assets - it contains compilation of all previous files. This is triggered by assets:precompile rake task.

在开发模式下，javascript requries加载了单独的标记：jquery，jquery_ujs.js，myscripts.js，最后是applications.js。当预编译的application.js存在并且从/ public / assets使用时会发生问题 - 它包含所有以前文件的编译。这由资产触发：预编译rake任务。

The solution is to remove /public/assets directory on development then application.js is used (from /app/assets/javascript) which doesn't include previous files. Generally doesn't use assets:precompile rake task on development.

解决方案是在开发时删除/ public / assets目录，然后使用application.js（来自/ app / assets / javascript），它不包含以前的文件。一般不使用资产：预编译rake任务开发。

Update

更新

Adding config.serve_static_assets = false to development.rb also solves problem for me without worrying about /public/assets.

将config.serve_static_assets = false添加到development.rb也为我解决了问题，而不必担心/ public / assets。

#2

A similar thing happened to me upgrading an application from Rails 3.0 to 3.1, it was my mistake. In your

类似的事情发生在我将应用程序从Rails 3.0升级到3.1时，这是我的错误。在你的

app/assets/javascripts/application.js

check that your are not calling twice the rails helpers, i have troubles using

检查你是不是两次铁路助手，我有麻烦使用

//= require_tree .

i have removed this and just left

我删除了这个，然后离开了

//= require jquery
//= require jquery_ujs
//= require myscripts

i deleted too app/assets/javascripts/rails.js, the file was generated by jquery-rails gem but this is no longer necessary

我删除了app / assets / javascripts / rails.js，该文件是由jquery-rails gem生成的，但不再需要

#3

For me the gotcha was the

对我来说，陷阱是

config.assets.debug = true

option.

选项。

#1