public function actionMove()
 {
     $nId = Yii::app()->request->getParam('id', NULL);
     $nParentId = Yii::app()->request->getParam('parent', NULL);
     $nOldParentId = Yii::app()->request->getParam('oldParent', NULL);
     $nPosition = Yii::app()->request->getParam('position', NULL);
     $nOldPosition = Yii::app()->request->getParam('oldPosition', NULL);
     if (Item::treeMove($nId, $nParentId, $nOldParentId, $nPosition, $nOldPosition)) {
         $this->jsonOutput(['status' => 'ok']);
     }
     $this->jsonOutput(['message' => 'Cannot move item.'], 'error');
 }