Track the on-page errors on Google Analytics

errorTracking.js

(function errorTracking() {
    window.onerror = function(msg, url, lineNo, columnNo, error) {
        var errorStack = error ? JSON.stringify(error.stack) : 'stack unavailale';
        var content = [
            msg, url, lineNo, columnNo, errorStack
        ].join(' - ');

        ga('send', 'event','error tracking', content);

        return false;
    };
})();