Track Outbound links in Google Analytics

gistfile1.js

// track outbound links
// usage <a class="button button_large" href="http://amzn.com/1628651628" rel="external" target="_blank">
    function trackOutboundClick(e) {
        var $link = $(e.currentTarget);
        var url = $link.attr('href');
        var target = $link.attr('target');
     
        ga('send', 'event', 'outbound', 'click', url, {
            'hitCallback': function() {
                if (target !== '_blank') {
                    document.location = url;
                }
            }
        });
    }
    $('[rel="external"]').on('click', trackOutboundClick);