Track outbound links in Google Analytics

gistfile1.txt

(function() {
		var links = document.getElementsByTagName('a');
		for(var i = 0; i < links.length; i++) {
			if(links[i].href.indexOf(location.host) === -1) {
				links[i].onclick = function() {
					gtag('event', 'click', {
						'event_category': 'outbound',
						'event_label': this.href
					});
				}
			}
		}
	})();