outbound-link-tracking.js

var trackOutboundLink = function(url, category) {
    ga('send', 'event', category, 'click', url, {
        'transport': 'beacon',
        'hitCallback': function() {
            document.location = url;
        }
    });
}
function addClickOnOutboundLink(link, category) {
    var href = link.attr('href');
    link.on('click', function(e) {
        e.preventDefault();
        trackOutboundLink(href, category);
    });
}
var clientDomain = document.domain.split('.').reverse()[1] + '.' + document.domain.split('.').reverse()[0];
jQuery('a').each(function() {
    var linkElement = jQuery(this);
    var href = linkElement.attr('href');
    if(href != null) {
        if(href.indexOf('mailto:') > -1) { 
            addClickOnOutboundLink(linkElement, 'Email');
        }
        if((href.indexOf('http://') > -1 || href.indexOf('https://') > -1) && href.indexOf(clientDomain) == -1) {
            addClickOnOutboundLink(linkElement, 'Outbound');
        }
        if(href.indexOf('tel:') > -1) {
            addClickOnOutboundLink(linkElement, 'Phone Call');
        }
    }
});