event.js

    $('#profile-subscriptions-form').on('submit', () => {
      var $form = $(this);

      var $validationFields = $form.find("[data-validate]");

      $validationFields = $validationFields.map(function() {
        var $this = $(this);
        if(typeof $this.attr("data-validate-required") !== "undefined" || $this.val() !== "") {
          return $this;
        }
      });

      if ($validationFields.length) {
        return;
      }

      trackAnalyticsEvent({
        metadata: {
          noun: 'register',
          target: 'form',
          verb: 'submitted',
          // ...
        },
      });
    });