Track JavaScript errors using Universal Analytics from Google.

JS-error-tracking-with-GA.js

function trackJavaScriptError(e) {
    var ie = window.event || {};
    var message = e.message || ie.errorMessage || '<no message>'
    var filename = e.filename || ie.errorUrl || '<no filename>';
    var lineno = e.lineno || ie.errorLine || '<no lineno>';
    var colno = e.colno || ie.errorColumn || '<no colno>';
    var source = filename + ':' + lineno + ':' + colno;
    ga('send', 'event', 'JavaScript Exception', message, source, {'nonInteraction': 1});
}

if (window.addEventListener) {
    window.addEventListener('error', trackJavaScriptError, false);
} else if (window.attachEvent) {
    window.attachEvent('onerror', trackJavaScriptError);
} else {
    window.onerror = trackJavaScriptError;
}