[javascript] Javascript window.print() in chrome, closing new window or tab instead of cancelling print leaves javascript blocked in parent window

The problem is that there is an in-browser print dialogue within the popup window. If you call window.close() immediately then the dialogue is not seen by the user. The user needs to click "Print" within the dialogue. This is not the same as on other browsers where the print dialogue is part of the OS, and blocks the window.close() until dismissed - on Chrome, it's part of Chrome, not the OS.

This is the code I used, in a little popup window that is created by the parent window:

var is_chrome = function () { return Boolean(window.chrome); }
window.onload = function() {
    if(is_chrome){
        /*
         * These 2 lines are here because as usual, for other browsers,
         * the window is a tiny 100x100 box that the user will barely see.
         * On Chrome, it needs to be big enough for the dialogue to be read
         * (NB, it also includes a page preview).
        */
        window.moveTo(0,0);
        window.resizeTo(640, 480);

        // This line causes the print dialogue to appear, as usual:
        window.print();

        /*
         * This setTimeout isn't fired until after .print() has finished
         * or the dialogue is closed/cancelled.
         * It doesn't need to be a big pause, 500ms seems OK.
        */
        setTimeout(function(){
            window.close();
        }, 500);
    } else {
        // For other browsers we can do things more briefly:
        window.print();
        window.close();
    }
}

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