rails 3.1：是ajax吗？

In rails 3.1, I implement as:
1. Define test action in post controller:

def test
    @p = Post.first
    respond_to do |format|
      format.js
    end
end

2. Define in routes.rb:

resources :posts do
  collection do
    get 'test'
  end
end

3. In index.html.erb of post folder, I add link:

<%= link_to "test", test_post_path, :remote => true %>

4. Create test.js.erb file in post folder:

code jQuery

My question is: "Is my implement Ajax in rails 3.1?" I don't really understand about ajax in rails.
If no, can you give me a link about ajax in rails 3.1 and the technique I set up, what is it?

You request is do by Ajax from your link. But the return of your action can be not usefull to you.

You need add in your app/view/posts directory a test.js.erb file and fill it with Javascript behaviour you want.

Yes it is ajax. When you add :remote => true to links and forms in rails, it automatically sends data to the server without refreshing your page on the browser. That's how ajax works in every language/script.

In your case, you can put js code in your test.js.erb file to update/interact the page (with jQuery). You might want to update some html div elements with the attributes of instance variable you set up @p .

Eg. in your test.js.erb

$("#some_div").html("<%= @p.title%>");

Then you have essentially made an ajax request to the server and update the client browser page with the server data without refreshing.