stuff.js

this.beforeSave()
  .then(this.send.bind(this))
  .then(this.success.bind(this))
  .then(this.afterSave.bind(this))
  // Error validation shown in page
  .catch(function(error){
      // HERE IS WHERE I WANT THE DEFAULT HTML5 ERRORS TO SHOW
      // This will be called if any of the above promises throw an error
  })
  .then(this.enable_save.bind(this))