How to track outbound links

track-outbound-links.js

/*
 * Track outbound links
 */
    
$(function() {
    // Track outbound links
    if(typeof(ga) !== 'undefined') {
        // Track outbound links        
        $('a[href*=http]').on('click', function(e) {
        
            var el = $(this);
            var href = el.attr('href');
            var http = 'http://' + window.location.host;
            var https = 'https://' + window.location.host;
            
            // If the link does not belong to the site then record it
            if(href.substr(0, http.length) != http && href.substr(0, https.length) != https) {
                var parts = href.split('/');
                parts.splice(3);
                var domain = parts.join('/');
            
                ga('send', 'event', 'Outbound Link', domain, href);
            }
        });
    }
});