Alert when browser window closed accidentally

by

This is not really a JQuery thing, I use this functions:

function setConfirmUnload(on) {
    window.onbeforeunload = (on) ? unloadMessage : null;
}

function unloadMessage() {
    return "Are you sure you want to leave this page";
}

Then, at any time you can call

setConfirmUnload(true) to enable the confirmation or false if you want to allow them to close the screen without a warning (if you have a close button for instance).

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