jQuery contact form submit with Google Analytics event

jquery-ga-form-submit.js

$('#contact-form').submit(function(e) {
  // delay the submit
  e.preventDefault();
  // we need this to call the form in a scoped function
  var self = this;
  ga('send', {
    eventAction: "submit",
    eventCategory: "form",
    eventLabel: "contact-form",
    hitType: "event",
    useBeacon: true, // useBeacon API, allows sending after page change
    hitCallback: function() {
      // now that the form has finished, submit normally
      self.submit();
    }
  });
  return false;
});