Ruby on Rails中的Ajax成功回调 [英] Ajax success callback in ruby on rails

问题描述

我想在我的ruby on rails教程中实现ajax，控制器将在处理ajax请求时返回一个对象.我不知道要处理我的JavaScript文件中的响应. 我想根据javascript文件中返回的对象来更新一些div.

Hi want to implement ajax in my ruby on rails tutorials and the controller will return an object on handling the ajax request. I dont know to handle the response in my javascript file. I want to update some div based on object returned in javascript file.

这是我在showcomments.js.erb中写的内容

Here is what I have written in my showcomments.js.erb

$('.show_comment').bind('ajax:success', function() {
    $(this).closest('tr')="Something here from the object returned");
});

我的调用ajax的链接是通过这一行代码

My link where ajax call is called is via this line of code

 <td><%= link_to 'Show Comment', :action => 'showcomment' , :id =>article, :remote => true ,:class=>'show_comment' %></td>

我处理此请求的控制器动作如下

My controller action where this request is handled is like this

def showcomment
   @article = Article.find(params[:article_id])
   @comment = @article.comments.find(params[:id])
    respond_to do |format|
      format.js{ render :nothing => true }
    end
end

这怎么办?

推荐答案

我只是想尝试扩展其他答案.

I just wanted to try and expand on the other answers a little bit.

在rails中，当您将:remote => true添加到链接时，它实际上会处理jquery ajax调用的第一部分.这就是为什么您不需要bind.(ajax:success, function(){ # do stuff here });

In rails when you add :remote => true to a link it essentially takes care of the first part of a jquery ajax call. That's why you don't need bind.(ajax:success, function(){ # do stuff here });

这是一个典型的jquery ajax调用

This is a typical jquery ajax call

$.ajax({
  url: "test.html",
  type: "POST"
}).done(function() {
  $( this ).addClass( "done" );
});

Rails负责第一部分，直到.done回调.因此，您的javascript erb模板中的所有内容都会像这样

Rails takes care of the first part, up to the .done callback. So anything in your javascript erb template is put in the callback like this

.done(function() {
  #your showcomments.js.erb file is inserted here
});

要从控制器呈现showcomments.js.erb模板，只需执行此操作

To render the showcomments.js.erb template from the controller just do this

def showcomment
  @article = Article.find(params[:article_id])
  @comment = @article.comments.find(params[:id])
  respond_to do |format|
    format.js
  end
end

format.js之后不需要任何内容​​，因为此时默认的rails动作是呈现与动作名称相同的js模板，在本例中为showcomment.js.erb.

You don't need anything after format.js because the default rails action at that point is to render a js template with the same name as the action, in this case it's showcomment.js.erb.

现在，您知道单击该链接时，它将直接渲染该showcomment模板，并且其中的所有JavaScript都将立即运行. Rails使使用ajax非常简单.希望对您有所帮助.

Now you know when that link is clicked it will go straight to rendering that showcomment template , and any javascript in there will be run instantly. Rails makes using ajax very simple. I hope that helps.

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