// current page host

let baseURI = window.location.host;

document.addEventListener('click', function(e) {

if (e.which != 1) return; // track only left-mouse clicks

if (e.defaultPrevented) return;

// abandon if no active link or link within domain

let link = e.target.closest && e.target.closest("a");

if (!link || (baseURI == link.host && !link.hasAttribute('data-track-outbound'))) return;

// invalid or blank target

if (!~["_self", "_top", "_parent"].indexOf(link.target)) return;

if (e.shiftKey || e.ctrlKey || e.altKey) return;

// cancel event and record outbound link

e.preventDefault();

let href = link.href;

window.ga('send', 'event', 'outbound', 'click', href, {

hitCallback: loadPage

});

// redirect after half-second if recording takes too long

setTimeout(loadPage, 500);

// redirect to outbound page

function loadPage() {

document.location = href;

}

});