Print from iFrame in current window, and add callbacks for before print, and after print.

iframePrint.js

(function() {
    var beforePrint = function() {
        console.log('Functionality to run before printing.');
    };
    var afterPrint = function() {
        console.log('Functionality to run after printing');
    };
var ifr=''//iframe ref;
ifr.focus();
var cw=''//ifr.contentWindow
    if (window.matchMedia) {
        var mediaQueryList = cw.matchMedia('print');
        mediaQueryList.addListener(function(mql) {
            if (mql.matches) {
                beforePrint();
            } else {
                afterPrint();
            }
        });
    }
   
    cw.onbeforeprint = beforePrint;
    cw.onafterprint = afterPrint;
}());