detect_print.js

/*  
 *  Modified from TJ VanToll's script 
 *  http://tjvantoll.com/2012/06/15/detecting-print-requests-with-javascript/
 */

(function() {
  var beforePrint = function() {
    _gaq.push(['_trackEvent', 'Print', document.title, window.location.pathname]);
  };
  var afterPrint = function() {
  };

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

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