The implementation of this JQUERY function drives me crasy!!!
I know there are a lot of articles about it and I have spend hours to read them, but could not find any useful solution!
I created a simple chat and need a functin to clear the user from the active user list, if he close the window. I don’t want to send any message only have the possibility clear something up before closing.

So the only way I have figured out yet, is using the beforeunload, but this is not working for my use case.
Here my code:

        $(window).on('beforeunload', function(){
        alert('beforeunload');
        $('#crMode').val('close');
        $('#chat').submit();
        return undefined;
        });

• The alert and the other 2 instruction seems to be ignored by Firefox and Chrome.
• If the user has nothing done with the window, even the message will not send.
• But when I press <Ctrl> F5 always a message appears!

So how to can solve my simple problem, to kill the user before he left the chat?

Thanks for your help!