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javascriptonbeforeunloadconfirm

Return confirm in JavaScript

I have problem with return confirm in Chrome. In Firefox it is ok.

window.onbeforeunload = function() {
    var result = confirm('Really?');

    if(result) {
        console.log('Do something');
    }
}

Any ideas? Thanks!

Solution

  • You should return something from beforeunload.

    The confirm will be ignored

    Since 25 May 2011, the HTML5 specification states that calls to window.showModalDialog(), window.alert(), window.confirm() and window.prompt() methods may be ignored during this event.

    see MDN

    window.onbeforeunload = function() {
    return 'Date will be lost: are you sure?'; //<= here
}

    If you don't return something, the actions within the handler function are executed before the page unloads.