how to know whether modal boxes (alert, prompt, confirm…) have been disabled in javascript?

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When that box is checked, the dialog “closes” immediately. You could check to see if the box closes unusually fast:

function dialog(message, success, failure) {
    var open_time = new Date();
    var result = alert(message);
    var close_time = new Date();

    if (close_time - open_time < 10) {
        failure();
    } else {
        success(result);
    }
}

dialog('Hello', function(result) {
    // The dialog probably was closed by the user
}, function() {
    // The dialog was closed really fast.
    // Either the user was typing while it popped up or the browser didn't
    //  display it in the first place
});

Although just using CSS and HTML to create modal dialogs would probably be much easier and more consistent across browsers and platforms. I personally don’t like Chrome’s approach.

Demo: http://jsfiddle.net/tS9G6/4/

I looked a little bit through Chromium’s source and that property isn’t stored anywhere, so there doesn’t seem to be some Chromium-specific property that you can look at.

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