(function ($) {
    var clickEventType = ((document.ontouchstart !== null) ? 'click' : 'touchend');
    $(document).on(clickEventType, "a[href]", function (event) {
        var gaExtensions = [
                "avi", "css", "csv", "doc", "docx", "eps", "epub", "jpg", "js",
                "mov", "mp3", "mpeg", "pdf", "png", "ppt", "pptx", "rar", "rtf",
                "kml", "json", "kmz", "mdb", "shp", "xml", "svg", "txt", "vsd",
                "vxd", "wma", "wmv", "xls", "xlsx", "zip"
            ],
            _re = new RegExp("\\.(?:" + gaExtensions.join("|") + ")(?:$|\\?)", "i"),
            $this = $(this),
            _href = $this.attr('href'),
            _lowerHref = _href.toLowerCase(),
            gaPrefixMailto = 'mailto',
            gaPrefixDownload = 'download',
            gaPrefixExternal = 'external',
            _event = false,
            _action = false,
            _label = false;
        if (!$this.attr('href').match(/^(?:javascript:|#?\s*)$/i)
            && !$(this).attr('onclick')
            && false === Boolean($(this).data("events"))){ /* Check for existing events on this node  */
            // first check is mailto:
            if((/^mailto:/).test(_lowerHref) ){  /* email check*/
                _event = gaPrefixMailto;
                _action = _lowerHref.substring(7);
            } else if (_re.test(_href) && typeof ga !== 'undefined') { /* Downloadable file */
                _event = gaPrefixDownload;
                _action = _re.exec(_lowerHref)[0].substring(1);
                _label = _lowerHref;
            } else if ((/^http(?:s)?:\/\//).test(_lowerHref) && _lowerHref.split("?")[0].indexOf(location.hostname.toLowerCase().replace(/www\./, "")) === -1) {  /* external url*/
                _event = gaPrefixExternal;
                _action = _href;
            }

            if (_event !== false ){
                ga(function() {
                    var trackers = ga.getAll();
                    for (var i = 0; i < trackers.length; i++) {
                        tracker=trackers[i];
                        var sent = {'hitType': 'event','eventCategory':_event,'eventAction':_action};
                        if( _label !== false ) sent['eventLabel'] = _label
                        tracker.send(sent);
                    }
                });
            }
        }
    });
})(jQuery);