Google analytics track outbound links
// Original source and author: https://www.axllent.org/docs/view/track-outbound-links-with-analytics-js/
function _gaLt(event) {
try {
/* If GA is blocked or not loaded, or not main|middle|touch click then don't track */
if (!ga.hasOwnProperty("loaded") || ga.loaded != true || (event.which != 1 && event.which != 2)) {
return;
}
var el = event.srcElement || event.target;
/* Loop up the DOM tree through parent elements if clicked element is not a link (eg: an image inside a link) */
while (el && (typeof el.tagName == 'undefined' || el.tagName.toLowerCase() != 'a' || !el.href)) {
el = el.parentNode;
}
/* if a link with valid href has been clicked */
if (el && el.href) {
var link = el.href;
/* Only if it is an external link */
if (link.indexOf(location.host) == -1 && !link.match(/^javascript\:/i)) {
/* Is actual target set and not _(self|parent|top)? */
var target = (el.target && !el.target.match(/^_(self|parent|top)$/i)) ? el.target : false;
/* Assume a target if Ctrl|shift|meta-click */
if (event.ctrlKey || event.shiftKey || event.metaKey || event.which == 2) {
target = "_blank";
}
var hbrun = false; // tracker has not yet run
/* HitCallback to open link in same window after tracker */
var hitBack = function() {
/* run once only */
if (hbrun) return;
hbrun = true;
window.location.href = link;
};
if (target) { /* If target opens a new window then just track */
ga(
"send", "event", "Outgoing Links", link,
document.location.pathname + document.location.search
);
} else { /* Prevent standard click, track then open */
event.preventDefault ? event.preventDefault() : event.returnValue = !1;
/* send event with callback */
ga(
"send", "event", "Outgoing Links", link,
document.location.pathname + document.location.search, {
"hitCallback": hitBack
}
);
/* Run hitCallback again if GA takes longer than 1 second */
setTimeout(hitBack, 1000);
}
}
}
} catch (e) {
// probably ga is not loaded or loaded async?fail silently for now
}
}
var _w = window;
/* Use "click" if touchscreen device, else "mousedown" */
var _gaLtEvt = ("ontouchstart" in _w) ? "click" : "mousedown";
/* Attach the event to all clicks in the document after page has loaded */
_w.addEventListener ? _w.addEventListener("load", function() { document.body.addEventListener(_gaLtEvt, _gaLt, !1) }, !1) :
_w.attachEvent && _w.attachEvent("onload", function() { document.body.attachEvent("on" + _gaLtEvt, _gaLt) });