/**
  * Execute the action
  *
  * @return  void
  */
 public function execute()
 {
     // call parent, this will probably add some general CSS/JS or other required files
     parent::execute();
     // get parameters
     $newIdSequence = trim(\SpoonFilter::getPostValue('new_id_sequence', null, '', 'string'));
     // list id
     $ids = (array) explode(',', rtrim($newIdSequence, ','));
     // loop id's and set new sequence
     foreach ($ids as $i => $id) {
         // build item
         $item['id'] = (int) $id;
         // change sequence
         $item['sequence'] = $i + 1;
         // update sequence
         BackendSlideshowModel::updateCategorySequence($item);
     }
     // success output
     $this->output(self::OK, null, 'sequence updated');
 }