JS Analytics Event Tracking for Downloads/Files

event-tracking.js

document.onclick = function(event) {

  event = event || window.event;
  var target = event.target || event.srcElement,
    targetElement = target.tagName.toLowerCase();
  if (targetElement == "a") {
    var href = target.getAttribute("href"),
      urlHost = document.domain.replace(/^www\./i,"");
    var urlPattern = "^(?:https?:)?\/\/(?:(?:www)\.)?" + urlHost + "\/?";
      eventCheck(href,urlPattern);
  }

function eventCheck(href,urlPattern){
    if ((href.match(/^https?\:/i)) && (!href.match(urlPattern))){
      if (href.match(/^.*\.(pdf|jpg|png|gif|zip|mp3|txt|doc|rar|js|py)$/i)) {
        _gaq.push(['_trackEvent', 'Download', 'click', href]);
      } else {
        _gaq.push(['_trackEvent', 'External', 'click', href]);
      }
    } else if (href.match(/^mailto\:/i)) {
      _gaq.push(['_trackEvent', 'Email', 'click', href.substr(7)]);
    } else if (href.match(/^.*\.(pdf|jpg|png|gif|zip|mp3|txt|doc|rar|js|py)$/i)) {
      _gaq.push(['_trackEvent', 'Download', 'click', href]);
    }
  }
};