Simple AJAX on Rails

Basic ideas:

• On server side:

1. 1. In routes.rb, setup routings to handle ajax request calls.
   2. In controller, handle ajax request by something like: respond_to do |format| format.js end
   3. In views, create *.js.erb file which has the same name as the corresponding controller function.

• On client side:
  1. In view pages, use tags like <%= button_to , ..., :remote => true, ... %>
  2. Trigger the ajax request.  E.g. by $('#ajax_submit').submit();
  3. Create a javascript like fn_some_callback() to handle callback from ajax response.