GA Custom Tracking.js

// External selector for jquery 
$.expr[":"].external = function(obj, index, meta, stack) {
    var a = $(obj).prop("href") || "";
    var server = window.location.href.split('/'); server = server[0] + "//" + server[2];    
    if(a == "#" || a == "" || a.indexOf(server)>-1 || a.indexOf("javascript:")>-1 ) {
        return false;
    }
    return true;
}

// download selector for jquery 
$.expr[":"].download = function(obj, index, meta, stack) {
    url = $(obj).prop("href") || "";
    extension = (url = url.substr(1 + url.lastIndexOf("/")).split('?')[0]).substr(url.lastIndexOf(".")); 
    if(['.pdf', '.doc', '.docx', '.xls', '.xlsx', '.ppt', '.pptx', '.rtf', '.txt', '.csv', '.pages', '.mp3', '.mov', '.avi', '.jpg', '.jpeg', '.gif', '.png', '.zip', '.gzip'].indexOf(extension) > -1) {
        return true;
    }
    return false;
}

// Has to be executed after ga is initialized (gets around adblockers, DNT, or ga loading issues)
ga(function(){

    // External Link Tracking
    $('a:external').click(function(e) {

        var url = $(this).prop("href");

        var event = {
            hitType: 'event',
            eventCategory: 'Outbound Link',
            eventAction: 'click',
            eventLabel: url,
            hitCallback: function() { document.location = url; },
            nonInteraction: true // do not count for bounce rate
        };

        if(url.substring(0, 7) == "mailto:") { 
            event.eventCategory = 'Email Link';
            event.nonInteraction =  false; // count for bounce rate (to decrease it)
        }

        if(url.substring(0, 4) == "tel:" || url.substring(0, 7) == "callto:") {
            event.eventCategory = 'Tel Link';
            event.nonInteraction =  false;
        }

        if(url.substring(0, 4) == "sms:") {
            event.eventCategory = 'SMS Link';
            event.nonInteraction =  false;
        }

        ga('send', event);

        e.preventDefault();

    });

    // Track downloads as page views
    $('a:download:not(:external)').click(function(e) {
    
        var url = $(this).prop("href");

        var $defaultPrevented = event.defaultPrevented;

        ga('send', {
            hitType: 'pageview',
            page: url,
            hitCallback: function() { 
                if(!$defaultPrevented) {
                    document.location = url;
                }
            }
        });

        e.preventDefault();
    });

    // Exception tracking with GA
    window.onerror = function(msg, url, line, col, error) {
        
        var extra = !col ? '' : '\ncolumn: ' + col;
        extra += !error ? '' : '\nerror: ' + error;
        
        ga('send', 'exception', {
            'exDescription': "JS Error: " + msg + "\nurl: " + url + "\nline: " + line + extra,
            'exFatal': false
        });
        
        return false;
    };

    /* Custom Event Tracking 
        Link Format: 
        <a href="some url"
            data-ga-event
            data-ga-event-category=""
            data-ga-event-action=""
            data-ga-event-label=""
            data-ga-event-value="">
                More Info
        </a>
     */

    $('a, button[type=submit], input[type=submit]').filter("[data-ga-event]").click(function(e) {

        var $this = $(this);

        if($this.data("ga-event-sent")) {
            return true;
        }

        var eventInfo = {
            hitType: 'event',
            hitCallback: function(){ $this.trigger("click"); },
            nonInteraction: true
        };

        if($this.data("ga-event-category")) {
            eventInfo.eventCategory = $this.data("ga-event-category");
        } else return true; // this is required by GA

        if($this.data("ga-event-action")) {
            eventInfo.eventCategory = $this.data("ga-event-action");
        } else return true; // this is required by GA

        if($this.data("ga-event-label")) {
            eventInfo.eventLabel = $this.data("ga-event-label");
        }

        if($this.data("ga-event-value")) {
            eventInfo.eventValue = $this.data("ga-event-value");
        }

        ga('send', eventInfo);

        e.preventDefault();

        $this.data("ga-event-sent", true);

    });
    
});