Track downloads and external links with ga.js

analytics.js

/*
  Track downloads and external links with ga.js
  Append to your spagetti object container and then just run
  self.Analytics.init() at the end of the global init() function.
*/
  
  Analytics: {

    init: function () {
      var self = this;

      self.initAssets();
      self.initOutbound();
    },

    initAssets: function () {
      var self = this;

      // Always reuse regex objects
      var rMatchExtension = /\.(doc.|xls.|ppt.|txt|jpg|png|svg|pdf|zip|rar|exe|wma|mov|avi|wmv|mp3)($|\&|\?)/i;
      var $a = $('a').filter(function (i) {
        var url = $(this).attr("href");
        return ( rMatchExtension.exec(url) ) ? true : false;
      });

      self.ieFix($a);

      // Bind click logging on links
      $a.on('click', function (e) {
        var extension = $(this).attr("href").split('.').pop();
        self.logClick(e, this, 'Download', extension);
      });
    },

    initOutbound: function () {
      // Pretty much the same stuff as above but for outbound links
      var self = this;

      var $a = $('a').filter(function (i) {
        return this.host != window.location.host;
      });

      self.ieFix($a);

      $a.on('click', function (e) {
        self.logClick(e, this, 'Outbound', 'Click');
      });
    },

    ieFix: function ($a) {
      // Wrap contents in <span> so that click event bubbles to <a> on IE
      if ( $('html').hasClass('ie') ) {
        $a.each(function () {
          $(this).wrapInner('<span></span>');
        });
      }
    },

    logClick: function (e, elem, type, value) {
      var $elem = $(elem);
      var url = $elem.attr('href');
      var target = $elem.attr('target');
      var isTargetBlank = ( typeof target === 'undefined' ) ? false : ( target.trim() === '_blank' );
      // e.which == 2 -> middle mouse click, meta -> cmd
      var isNewTab = e.which == 2 || e.metaKey || e.ctrlKey || isTargetBlank;

      // console.log('Logging', type, value, url);
      _gaq.push(['_trackEvent', type, value, url]);

      // Check if it's not a new tab and if GA is loaded (Adblock custom lists fix?)
      if ( !isNewTab && window._gat && window._gat._getTracker ) {
        e.preventDefault();

        // Ghostery surrogate mocks _gat and triggers a redirect only on _link
        _gaq.push(['_link', url]);

        // Pushing a function to _gaq ensures that it gets opened after logging
        _gaq.push(function () {
          // console.log('Loading', url);
          window.location.href = url;
        });
      };
    }

  }, // end Analytics