How to display an alert box through ajax when my show action is loaded

Sorry for this newbie question, I am trying to display a simple alert box through Ajax when my galleries/show view is loaded. (After I would like to display content instead of this alert box)

Here is my code so far:

galleries_controller.rb

  def show
    @gallery = Gallery.find(params[:id])

    respond_to do |format|
      format.js
  开发者_运维百科    format.html # show.html.erb
    end
  end

application.js

// Tell Rails to use .js
jQuery.ajaxSetup({
  'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")} 
})

$(document).ready(function(){

  // How can I load show.js.erb ?
  $('body').load() 

});

show.js.erb

alert('ajax works!');

I can't figure how to make it works. Thanks a lot for your help.

---

Remote everything in application js

in show.html.erb

<%= link_to "Get Gallery", gallery_url(@gallery), :remote => true %>

Reload /galleries/show/:id Click the link

---

Rails returns show.js.erb (after evaluation) when you hit Gallery#show from an AJAX call. So, you can get the contents returned with jQuery.get:

$.get({'gallery/show/some_id_number', dataType: script});

The dataType: script property will cause jQuery to execute what's returned (i.e. the contents of the evaluated show.js.erb).