Track Javascript errors with Google Analytics

ga.js

window.addEventListener('error', function(event) {
      _gaq.push([
        '_trackEvent',
        'JS Error',
        event.message,
        event.filename + ': ' + event.lineno,
        true
    ]);
});


// ajax errors with jquery
$(document).ajaxError(function(event, request, settings, error) {
    _gaq.push([
        '_trackEvent',
        'Ajax error',
        settings.url,
        event.result,
        true
    ]);
});