Rails - May 2010 - form_for success and failure callbacks

I''ve created a login form using rails 3 & jquery-ujs and all is
working
except I''d like to detect whether the AJAX call to the server was
successful, for example in the event that internet connection is lost.

I''m using form_for but digging through the docs doesn''t seem
to have
anything to help with this.

My current tag looks like...
<%= form_for @user_session, :remote => true, :html => { :onsubmit =>
"displayProcessing()" } do |f| %>

I''ve tried adding :success and :failure but these don''t seem
to work.

Could anyone give me any pointers?

Cheers, Phil
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Still stuck with this problem.

Does no one have any pointers on this?
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