onbeforeunload wait for ajax result

Question

Is it possible for onbeforeunload() function to wait for ajax result and move to a jsp based on the resultvalue or atleast show a message before unloading?

Answer 1

This is my strategy and works for me:

_number_of_active_ajax ++;
$.ajax({
    url: REQUEST_URL,
    timeout: 3000
})
.always(function() {
    _number_of_active_ajax --;
});

window.onbeforeunload = function() {
    if(_number_of_active_debounce > 0 || _number_of_active_ajax > 0)
        return "Your question";
}

}

It will show a message to use if the page has an active request.