Google Adwords Asynchronous Remarketing Javascript Module - Lazy Loading Adwords Conversion Code

Lazy Load Google Remarketing & Conversion Javascript Module.js

// This module can be used to trigger the Google Adwords remarketing or conversion tag asynchronously only when you need it (lazy loading) without loading unused ressources
// Mostly useful when the Google Remarketing tag or Conversion tag is triggered only on specific conditions.
// Author : Vincent Hsu -> twitter.com/suisseo -> http://www.suisseo.ch
// Language : Javascript
// Usage : googremarketing.loadTag(conversionid, conversionlabel)
// Start Google Remarketing Module
var googremarketing = (function() {
    var asyncload = 0;
    // Load Async Google Adwords remarketing code
    function Gremloader() {
        if (asyncload == 0) {
            var g = document.createElement('script');
            var s = document.getElementsByTagName('script')[0];
            g.src = 'https://www.googleadservices.com/pagead/conversion_async.js';
            s.parentNode.insertBefore(g, s);
            asyncload = 1;
        }
    }
    // Wait...
    function whenAvailable(name, callback) {
        var interval = 20; // ms
        window.setTimeout(function recName() {
            window[name] && callback(window[name]) || window.setTimeout(recName, interval)
        }, interval);
    }
    //Set Google Remarketing Tag
    function setTag(convid, convlabel) {
        window.google_trackConversion({
            google_conversion_id: convid,
            google_conversion_label: convlabel,
            google_remarketing_only: true
        });
    }
    return {
        loadTag: function(conversionid, conversionlabel) {
            Gremloader();
            whenAvailable("google_trackConversion", function(t) {
                setTag(conversionid, conversionlabel);
            });
        }
    }
}());
// End of Google Remarketing module