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

Question

I have a private web based app where sometimes I genuinely ask to the users what they want to do in given situations. To do so, I\'m using the confirm function

Answer 1

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.

Answer 2

You can't do anything about it. It's a browser feature.

You can check for the timing -

How to Detect "prevent this page from creating additional dialogs"

This suggests doing the following :

function myConfirm(message){
    var start = new Date().getTime();
    var result = confirm(message);
    var dt = new Date().getTime() - start;
    // dt < 50ms means probable computer
    // the quickest I could get while expecting the popup was 100ms
    // slowest I got from computer suppression was 20ms
    for(var i=0; i < 10 && !result && dt < 50; i++){
        start = new Date().getTime();
        result = confirm(message);
        dt = new Date().getTime() - start;
    }
    if(dt < 50)
       return true;
    return result;
}