render :js is something that can be used in place of the render :update.
Which means, the request type should be XHR and not HTTP... in simple 
words, the render :js will only work for Ajax requests.

If you want something of this sort for the normal HTTP requests... it 
can be achieved by something like this in your controller...


@js = "alert('hi')" # or whatever set of js statements needed
render :inline => "<%= javascript_tag(@js) %>"


regards,
Sur

http://crimson9.com
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