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I write a before_filter like this: def authenticate_user if request.xhr? flash.now[:alert] = 'Error' render :partial => "js_helpers/popover", :formats => :js else authenticate_user! end end However, it doesn't work as expected. The log file shows: Rendered js_helpers/_popover.js.erb (0.1ms) Filter chain halted as :authenticate_user rendered or redirected The function of the js code is to show a popover block showing flash message. but it looks like the js code is not excited at all. So, I changed my way: def authenticate_user if request.xhr? flash.now[:alert] = 'Error' render :js => "window.location = '/users/sign_up'" else authenticate_user! end end Instead, I want to redirect to sign up page. However, there is still problems. the flash seems not work How can I achieve my goal: when the request is an ajax call, execute come javascript code or redirect_to a new page. Under both condition, I need to store some message in flash. Plus, the javascript code is very long so that I need to put it in a file. How can I use render :js to execute a javascript inside a file?

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