Is there any way to detect if user pressed "Stay on page" or "Leave page" in beforeunload event?

Question

Is there any way that I could detect in the following code that either user clicked "leave page" or "stay on page" button ?

$(window).on('beforeunload', function (){
    return "You save some unsaved data, Do you want to leave?";
});

Answer 1

With a few hacks you can at least determine if the user stayed.
If the user left the page, there's not much you can do about that :

var timeout;

$(window).on('beforeunload', function (){
    timeout = setTimeout(function() {
        // user stayed, do stuff here
    }, 1000);
    return "You save some unsaved data, Do you want to leave?";
});

FIDDLE