yii gii自动生成的curd添加批量删除实例

array(
       'selectableRows' => 2,
       'footer' => '<button type="button" onclick="GetCheckbox();" style="width:76px">批量删除</button>',
       'class' => 'CCheckBoxColumn',
       'headerHtmlOptions' => array('width' => '33px'),
       'checkBoxHtmlOptions' => array('name' => 'selectdel[]'),
     ),

public function actionDelall() {
        if (Yii::app()->request->isPostRequest) {
            $criteria = new CDbCriteria;
            $criteria->addInCondition('rec_id', $_POST['selectdel']);
            Cartdb::model()->deleteAll($criteria);
            if (isset(Yii::app()->request->isAjaxRequest)) {
                echo 'ok';
            }
            else
                $this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : array('index'));
        }
        else
            throw new CHttpException(400, 'Invalid request. Please do not repeat this request again.');
    }