Rails 4 how to catch ajax:success event

Question

I'm on Rails 4.0.

I'm sending an event like this (note the :remote=>true):

<%= button_to 'yes', {controller:'videos', action:'rate', id: video.hashed_id, yesno:'yes'}, {:remote=>true, :class=>"rate-btn yes-btn btn btn-default btn-sm"} %>

My controller looks like this:

  def rate
    video = Video.find_by( hashed_id: params[:id])
    action  = params[:yesno]
    puts video.hashed_id
    puts action

    respond_to do |format|

      if (action=='yes') 
        new_rating = video.rating==1 ? 0 : 1 
        video.update( is_new:0, rating: new_rating )
        format.html { redirect_to controller:'projects', action: show, id: video.project.hashed_id }
        format.json { head :no_content }
        format.js { render :nothing=>true }

      end    

      if (action=='no') 
        new_rating = video.rating==-1 ? 0 : -1
        video.update( is_new:0, rating: new_rating )
        format.html { redirect_to controller:'projects', action: show, id: video.project.hashed_id }
        format.json { head :no_content }
        format.js { render :nothing=>true }
      end

    end

  end

I'm kind of winging it with the format.json/format.html because I don't fully understand which one should apply from an AJAX request.

On the view (where the button lives) I have this:

$(document).ready( function($) {
        console.log('ready');
    $(document).ajaxSuccess( function(data) {alert(data);} )
    $(document).ajaxError( function(data) {alert(data);} )
    $('.rate-btn').closest('form').on('ajax:success', function() {
      console.log('ajax:success!');
    });

    $('.button_to').bind("ajax:success", function() {
    console.log( 'test' );
    });

});

After clicking the button, I get ready in the console, but no matter what I do I can't get the test to show up in the console. What am I missing?

Update:

I tried clicking the button while watching /log/development.log and this is what I see:

Started POST "/videos/rate/lq7lv3218c/yes" for 127.0.0.1 at 2013-08-29 17:14:59 -0400
Processing by VideosController#rate as JS
  Parameters: {"authenticity_token"=>"es4wPqFrxxxxxFsbHQR/gAzofDC+ZwYsiiJ7RAQZUHk=", "id"=>"lq7lv3218c", "yesno"=>"yes"}
  [1m[36mVideo Load (0.3ms)[0m  [1mSELECT `videos`.* FROM `videos` WHERE `videos`.`hashed_id` = 'lq7lv3218c' LIMIT 1[0m
  [1m[35m (0.1ms)[0m  BEGIN
  [1m[36mSQL (0.3ms)[0m  [1mUPDATE `videos` SET `rating` = 0, `updated_at` = '2013-08-29 21:14:59' WHERE `videos`.`id` = 18[0m
  [1m[35m (0.3ms)[0m  COMMIT
  Rendered videos/rate.html.erb (0.0ms)
Completed 200 OK in 7ms (Views: 2.0ms | ActiveRecord: 1.1ms)

I'm a rails n00b but it looks ok to me.

Answer 1

The button_to helper builds a form around a submit button. And the form is what receives the data-remote attribute (see: http://apidock.com/rails/ActionView/Helpers/UrlHelper/button_to). So, I'd try this:

$('.rate-btn').closest('form').on('ajax:success', function() {
  console.log('ajax:success!')
});      

Since you're on Rails 4.0 I'm guessing you're on jQuery 1.9. Binding for events seems to have changed a bit there. So that could be part of it if this has worked for you before. Using .on() for event binding has been preferred over .bind() since 1.7.