beforeunload event not triggering in IOS Devices

Question

When user leave page without saving at that time i am using beforeunload to show popup that if you leave then your changes may not be saved so user can choose Leave or Stay but it is not triggering in IOS Device (Iphone, Ipad) so I am stuck in IOS devices.

var isSkipUnsavedChangePopup = false;
    window.addEventListener("beforeunload", function (e) {
        var confirmationMessage = "Are you sure want to leave?";
        if (!$("#btnSave").prop("disabled") && !isSkipUnsavedChangePopup) {
            (e || window.event).returnValue = confirmationMessage;
            return confirmationMessage;
        }
    });

Answer 1

Use unload of jquery mobile this way

$(window).unload(function() {
  alert('Handler for .unload() called.');
});

here is doc: https://demos.jquerymobile.com/1.0a2/experiments/api-viewer/docs/unload/index.html