Cross browser print request detection (IE 5+, Firefox 6+, Chrome 9+, and Safari 5.1+ )

print.js

(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;
}());

$.fn.beforeprint = function(callback) {
    return $(this).each(function() {
        if ( !jQuery.isWindow(this) )
            return;
        if ( this.onbeforeprint !== undefined )
            $(this).on('beforeprint', callback);
        else if ( this.matchMedia )
            this.matchMedia('print').addListener(callback);
    });
};
$.fn.afterprint = function(callback) {
    return $(this).each(function() {
        if ( !jQuery.isWindow(this) )
            return;
        if ( this.onafterprint !== undefined )
            $(this).on('afterprint', callback);
        else if ( this.matchMedia )
            $(this).one('mouseover', callback);
    });
};