Question

I’m using this code, which has stemmed from here and here.

$('#my_button').on('click', function (e) {
    var iframe = document.createElement('iframe');
    iframe.id = "my_iframe";
    iframe.onload = function() {
        var doc = iframe.contentDocument || iframe.contentWindow.document;
        doc.getElementsByTagName('body')[0].innerHTML = "<p>test123</p>";

        iframe.contentWindow.focus(); 
        iframe.contentWindow.print();

        $("#my_iframe", top.document).remove();
    };

    document.getElementsByTagName('body')[0].appendChild(iframe);
});

Without the remove line, it prints fine. However, the remove line removes the iframe before it has a chance to execute the print(). How can I set up some kind of callback so that it prints and only then removes the iframe?

Thanks.

Answer 1

I found this solution when I was searching for print event detection:

http://tjvantoll.com/2012/06/15/detecting-print-requests-with-javascript/

Here I add the JS code as requested by Stano, but it is important to also read the whole linked post as there are limitations to this approach. In general the post is about the onafterprint event that only works in IE and a solution to make that event work in other browsers.

(function() {
    var beforePrint = function() {
        console.log('Functionality to run before printing.');
    };
    var afterPrint = function() {
        console.log('Functionality to run after printing');
    };

    if (window.matchMedia) {
        var mediaQueryList = window.matchMedia('print');
        mediaQueryList.addListener(function(mql) {
            if (mql.matches) {
                beforePrint();
            } else {
                afterPrint();
            }
        });
    }

    window.onbeforeprint = beforePrint;
    window.onafterprint = afterPrint;
}());