Google Analytics Custom Event Tracking

gaEventTracking.js

https://developers.google.com/analytics/devguides/collection/gajs/eventTrackerGuide
_gaq.push(['_trackEvent', 'api error', 'api_name', 'status code: ' + jqXHR.status]);
function noErrorMa() {
	return true;
}

window.onerror = noErrorMa;
window.onerror = function (errorMsg, url, lineNumber, column, errorObj) {
    if (errorMsg.indexOf('Script error.') > -1) {
            return;
        }
    alert('Error: ' + errorMsg + ' Script: ' + url + ' Line: ' + lineNumber
    + ' Column: ' + column + ' StackTrace: ' +  errorObj);
}