Well, found my answer:
$ ->
$('form').bind 'ajax:success', (event,data,status,xhr) -> console.log(data)
source:
http://www.simonecarletti.com/blog/2010/06/unobtrusive-javascript-in-rails-3/
On Thursday, 22 November 2012 17:21:12 UTC+8, resting wrote:
I'm learning rails, while doing my app.
> So this is just the tip of the ice berg and I foresee many more questions
> in future.
>
> I have the following setup.
> Basically, on clicking the login button, a ajax request is sent, and the
> json response "message":"fail" is returned.
>
> My question is, how do I get the response in the success callback for
> processing?
> Here's what I have at the moment.
>
> index.html.erb
>
> <h2>Log in</h2>
> <%= form_for @user, :remote => true, :url => { :action => "login",
> :controller => "users" }, :html => { :class => "login" } do |f| %>
> <%= label_tag(:password, "Password") %>
> <%= f.text_field :password %>
> <%= f.submit "Login" %>
> <% end %>
>
> home.js.coffee
>
> $ ->
> $('form').bind 'ajax:success', (result) -> console.log(result)
>
> Output of console log
>
> jQuery.Event {type: "ajax:success", timeStamp: 1353575112551,
> jQuery18209272595844231546: true, isTrigger: true, exclusive: undefined…}
>
> I was actually expecting the console log output to be something like result[{
> "message" : "fail"}]?
>
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