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October 18, 2018 13:49
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Google analytics external links tracking code
Include just before </html> #analytics #tracking #javascript
From https://www.axllent.org/docs/view/track-outbound-links-with-analytics-js/#manually-track-outbound-links
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function _gaLt(event) { | |
/* 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); | |
} | |
} | |
} | |
} | |
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)}); |
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