A solution for when hitCallback functions do not receive a response using Google Analytics (analytics.js) http://dsam.co/WQJUtY

google-analytics-not-loaded-hitcallback.js

var url = "http://dsam.co/WQJUtY";
 
/*
 * Simply checks that the loaded property exists 
 * and that it has a value of true. 
 */
 
if (ga.hasOwnProperty('loaded') && ga.loaded === true) {
    //Success, ga is loaded
    ga('send', 'event', {
        'eventCategory' : 'Outbound',
        'eventAction' : 'Link',
        'eventLabel' : url,
        'eventValue' : '1',
        'hitCallback' : function () {
            document.location = url;
        }
    });
} else {
    //Not loaded, continue without tracking the data
    document.location = url;
}