How Can I Reliably Detect Browser Close Events in JavaScript?

How to Effectively Handle Browser Close Events

Detecting browser close events can be challenging, especially with methods like jQuery's onbeforeunload and onunload not always being reliable. This article provides a solution to detect window close, unload, or beforeunload events effectively.

Solution:

The following JavaScript code can be used to detect browser close events:

window.onbeforeunload = function (event) {
    var message = 'Important: Please click on \'Save\' button to leave this page.';
    if (typeof event == 'undefined') {
        event = window.event;
    }
    if (event) {
        event.returnValue = message;
    }
    return message;
};

$(function () {
    $("a").not('#lnkLogOut').click(function () {
        window.onbeforeunload = null;
    });
    $(".btn").click(function () {
        window.onbeforeunload = null;
});
});

Optional Implementation:

The second function in the code is optional. It prevents the prompt from displaying when clicking on specific elements, such as #lnkLogOut and .btn.

Note:

It's important to be aware that custom prompts may not work in Firefox. Refer to [this thread](link-to-thread) for more information.

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