linktracking.js

/* Attach tracking to all download & external links */
var _gaq = _gaq || [];

function _gaLt(event){
    var el = event.srcElement || event.target;

    /* Loop up the tree through parent elements if clicked element is not a link (eg: an image in a link) */
    while(el && (typeof el.tagName == 'undefined' || el.tagName.toLowerCase() != 'a' || !el.href))
        el = el.parentNode;

    if(el && el.href){
    if(el.href.indexOf(location.host) == -1){ /* external link */
            _gaq.push(["_trackEvent", "Outgoing Links", el.href, document.location.pathname + document.location.search]);
            _gaq.push(["b._trackEvent", "Outgoing Links", el.href, document.location.pathname + document.location.search]);
            /* if target not set then delay opening of window by 0.5s to allow tracking */
            if(!el.target || el.target.match(/^_(self|parent|top)$/i)){
                setTimeout(function(){
                    document.location.href = el.href;
                }.bind(el),500);
                /* Prevent standard click */
                event.preventDefault ? event.preventDefault() : event.returnValue = !1;
            }
        }

    }
}

/* Attach the event to all clicks in the document after page has loaded */
var w = window;
w.addEventListener ? w.addEventListener("load",function(){document.body.addEventListener("click",_gaLt,!1)},!1)
 : w.attachEvent && w.attachEvent("onload",function(){document.body.attachEvent("onclick",_gaLt)});