ex.js

(function() {
  var forms = document.getElementsByClassName('new_submission_score');

  function handleSuccessfulSave(evt, xhr, status, error) {
    debugger;
    createFlashNotification("success", "Saved!");
  }

  for (var i = 0; i < forms.length; i++) {
    $(forms[i]).on('ajax:success', handleSuccessfulSave);
  }
})();