How to make an AJAX call to different domains in Ruby on Rails 3.0

I have an action email in my controller of application running on www.example.com and I am trying to send the form data of email to [www.data.example.com/email](http://www.data.example.com/email) where my another application receives the request and I am able to save the data in js format. But I want to send back the acknowledgement to www.example.com and replace the html using rjs template. Here are some code for you reference:

email.html.erb called on www.example.com

   <div id="div_content">

    <%= form_for(@user, :url => "[http://data.example.com/mail](http://data.example.com/mail)", :remote => true) do |f| %>

    <%= f.label :email %>

    <%= f.text_field :email%>

    <% end %>
   </div>

email action of application on : data.example.com/email -

def email
  @user = User.create(params[:user])

  respond_to do |format|
    if @user.save!

       format.html { redirect_to(user_page_path(@user.vip_id), :notice => 'Thank you! You are now on our priority list.') }

       format.js
    else
       format.html { render :text => "user can not be saved at this moment!"}

    end
  end
end

email.js.rjs called on www.data.example.com/email

page.replace_html :div_content, :partial => "show", :object => @user

I can see in my log that request comes all the way from one domain to
sub domain and even action gets triggered but, I can not get the response back to the main domain. So, is there any way to send a callback to main domain. I just want to reflect changes there at the form which is inside div_content div and want to replace with content of _show.html.erb which I have on my sub domain.

Many Thanks,
Surya :slight_smile:

If you're trying to do all this in JavaScript, you're going to run smack into the Same Origin Policy. Unless you use a proxy on www.example.com, you can't update the page using data requested from data.example.com, or even www.example.com:2020 -- subdomain and port must match. More here: http://en.wikipedia.org/wiki/Same_origin_policy

Walter

hey Thanks for your kind response. So, what I should do to achieve the same?? Any idea?

hey Thanks for your kind response. So, what I should do to achieve the same?? Any idea?

You can use a proxy endpoint on www.example.com to reflect what you get from data.example.com into the correct address space. You can also use a cross-domain privilege escalation to leave things as they are. If you control both servers, google "cross-domain JavaScript" for a thousand pounds of documentation on how to set this up. Personally, I would see if you could re-architect the system so that the request could happen within the same domain. You may be able to set up your server such that www.example.com/data/ and data.example.com/ are precisely the same thing.

Walter