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

Rails
1

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 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

<%= form_for(@user, :url => "http://data.example.com/mail",

:remote => true) do |f| %>

<%= f.label :email %>

<%= f.text_field :email%>

<% end %>

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_contentdiv and want to replace with content of
_show.html.erb which I have on my sub domain.

Many Thanks,
Surya :slight_smile:

2

On Aug 13, 2011, at 6:08 AM, Surya wrote:

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.

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: Same-origin policy - Wikipedia

Walter

3

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

On Sat, Aug 13, 2011 at 6:29 PM, Walter Lee D.
[email protected]wrote:

email.html.erb called on www.example.com
<%= f.text_field :email%>

  format.html { render :text => "user can not be saved at this

If you’re trying to do all this in JavaScript, you’re going to run smack
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Regards,
Surya

4

On Aug 13, 2011, at 9:11 AM, Surya wrote:

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