Setup Google Analytics to track outbound links. Supports target="_blank".

README.md

Google Analytics Outbound Links Tracking

The official answer from Google does not support target="_blank" links and requires you to manually add code to each anchor link.

This solution handles all links on page and checks hostname and target automatically before adding onclick events.

Google-Analytics-outbound-links.js

for (var links = document.links, i = 0, length = links.length; i < length; i++) {
  var link = links[i];
  if (link.hostname != window.location.hostname) {
    link.onclick = function(e) {
      var url = e.target.href;
      var openingInNewWindow = (e.target.target && !e.target.target.match(/^_(self|parent|top)$/i)) || e.ctrlKey || e.shiftKey || e.metaKey;
      ga('send', 'event', 'outbound', 'click', url, {
        'transport': 'beacon',
        'hitCallback': openingInNewWindow ? null : function() {
          document.location = url;
        }
      });
      return openingInNewWindow;
    }
  }
}