Rails - Mar 2007 - inability to do a redirect_to when an ajax call is made during a before_filter

I have before_filters set up doing authentication.  In my
before_filters, I have some code that expires idle sessions when a
controller action happens, and when it meets the idle criteria i do
a :redirect to the login page.

However, I have run into the strange situation where when an ajax call
is performed when the session goes idle, the :redirect to the login
page doesn''t work.  In the log, it shows the redirection taking place,
but nothing is displayed on the screen.

The business logic works when a non-ajax call is invoked when the
session goes idle.  Any idea of why a redirect isn''t possible here???

thx in advance.


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> However, I have run into the strange situation where when an ajax call
> is performed when the session goes idle, the :redirect to the login
> page doesn''t work.  In the log, it shows the redirection taking
place,
> but nothing is displayed on the screen.
>
> The business logic works when a non-ajax call is invoked when the
> session goes idle.  Any idea of why a redirect isn''t possible
here???
>   
If it''s an ajax call, your browser is not expecting a new page, so the 
response will not be sent directly to the browser, but just some 
javascript code that will execute on the current document context.

So.. the way to redirect after an ajax call, is by doing it client-side, 
with a javascript redirect. You have a clean way of doing that by using 
in your action the rjs capabilities of rails and doing something like
       render :update do |page|
          page.redirect_to your_url_for_parameters_or_string
       end

This will cause a javascript redirect to be sent to the browser (by 
changing the windows.href.location property of the caller), so the 
redirect should be working fine.

regards,

javier ramirez

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> If it''s an ajax call, your browser is not expecting a new page, so
the
> response will not be sent directly to the browser, but just some
> javascript code that will execute on the current document context.
>
> So.. the way to redirect after an ajax call, is by doing it client-side,
> with a javascript redirect. You have a clean way of doing that by using
> in your action the rjs capabilities of rails and doing something like
>        render :update do |page|
>           page.redirect_to your_url_for_parameters_or_string
>        end
>
> This will cause a javascript redirect to be sent to the browser (by
> changing the windows.href.location property of the caller), so the
> redirect should be working fine.
So I have something like
navigation_controller
  before_filter :=> "login_check"

def login_check...
   expire_check?
end

def expire_check
   if (expire )
        //current code
        redirect_to :controller=>"account",
:action=>"login"

        ////do i put the rjs redirect here????
end

My next question would be is how do i tell the difference between on
the server whether to do a regular redirect or a rjs redirect call..

thx a lot
-dan


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> My next question would be is how do i tell the difference between on
> the server whether to do a regular redirect or a rjs redirect call..
>   
that you can do by checking request.xhr?. It will return true only if 
ajax is being used (it checks an http header called XML_HTTP_REQUEST or 
something like that)
> So I have something like
> navigation_controller
>   before_filter :=> "login_check"
>
> def login_check...
>    expire_check?
> end
>
> def expire_check
>    if (expire )
>         //current code
>         redirect_to :controller=>"account",
:action=>"login"
>
>         ////do i put the rjs redirect here????
> end
>   
If you are going to use the action both from ajax and normal request, 
then you have to use a condition

def expire_check
   if (expire )
	url_params={:controller=>"account", :action=>"login"}
	if request.xhr?
		render :update do |page|
			page.redirect_to url_params
		end	
        else
		//current code
        	redirect_to url_params
	end
   end
end

if you are just going to use it from ajax, you can put directly the render
update and forget about asking for xhr?

regards,

javier ramirez 


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Hi Dan,
> I have before_filters set up doing authentication.  In my
> before_filters, I have some code that expires idle sessions when a
> controller action happens, and when it meets the idle criteria i do
> a :redirect to the login page.
>
> However, I have run into the strange situation where when an ajax call
> is performed when the session goes idle, the :redirect to the login
> page doesn''t work.  In the log, it shows the redirection taking
place,
> but nothing is displayed on the screen.
>
> The business logic works when a non-ajax call is invoked when the
> session goes idle.  Any idea of why a redirect isn''t possible
here???
The problem is in what the browser''s expecting as a reponse: html or
js.
Your log shows you that the problem is that the browser doesn''t know
what to
do with what it''s getting.  Without seeing a little code I can only say
that
you''ll probably need to test the request type (i.e., using responds_to)
and
then either do your existing redirect_to for html requests or a:
render :update do |page|
  page.redirect_to :action => whatever
end

hth,
Bill 



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thx guys.. your answers were dead on.. my session expiration works
now :)
-dan


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