Is it possible to display a custom message in the beforeunload popup?

Question

When using window.onbeforeunload (or $(window).on(\"beforeonload\")), is it possible to display a custom message in that popup?

Maybe a sma

Answer 1

Try this code for all all browsers supported

window.onbeforeunload = function (e) {
    e = e || window.event;

    // For IE and Firefox prior to version 4
    if (e) {
        e.returnValue = 'Sure?';
    }

    // For Safari
    return 'Sure?';
};