Ajax success callback in ruby on rails

问题:

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.

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"); }); 

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> 

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 

How can this be done?

回答1:

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

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 });

This is a typical jquery ajax call

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

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 }); 

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 

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.

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.

回答2:

change showcomment to this:

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

In showcomments.js.erb you can access both objects @article and @comment. A sample use is as below:

$('#yourdiv').html('<%= @article.name %>'); 

回答3:

You render nothing when responding to js format. So code in showcomments.js.erb isn't evaluated. Remove { render :nothing => true } in controller and do whatever you want in showcomments.js.erb. BTW you don't need ajax:success event. It is the end of request already.

showcomments.js.erb

$('.show_comment').closest('tr').html("<%= # you may render partial here or whatever %>"); 

文章来源: Ajax success callback in ruby on rails