Simple Google Analytics event tracking. Tracks external links, downloads, and mailtos

gaEventTracking.js

document.onclick = function(event) {
 
    event = event || window.event;
    var target = event.target || event.srcElement,
        targetElement = target.tagName.toLowerCase();
 
    if (targetElement == "a") {
        var href = target.getAttribute("href"),
            urlHost = document.domain.replace(/^www\./i,"");
        var urlPattern = "^(?:https?:)?\/\/(?:(?:www)\.)?" + urlHost + "\/?";
        eventCheck(href,urlPattern);
    }
 
    function eventCheck(href,urlPattern){
        if ((href.match(/^https?\:/i)) && (!href.match(urlPattern))){
            if (href.match(/^.*\.(pdf|jpg|png|gif|zip|mp3|txt|doc|rar|js|py)$/i)) {
                _gaq.push(['_trackEvent', 'Download', 'click', href]);
            } else {
                _gaq.push(['_trackEvent', 'External', 'click', href]);
            }
        } else if (href.match(/^mailto\:/i)) {
            _gaq.push(['_trackEvent', 'Email', 'click', href.substr(7)]);
        } else if (href.match(/^.*\.(pdf|jpg|png|gif|zip|mp3|txt|doc|rar|js|py)$/i)) {
            _gaq.push(['_trackEvent', 'Download', 'click', href]);
        }
    }
};