Yii Check Valid Form

 $form = $this->beginWidget('CActiveForm', array(
        'id' => 'classifieds-Post-form',
         'enableClientValidation'=>true,
         'enableAjaxValidation'=>true,
         'clientOptions'=>array(
                        'validateOnSubmit'=>true,
                ),
        'focus' => array($Classified, 'category_id'),
        'htmlOptions' => array(
            'class' => 'form-horizontal',
            'enctype' => 'multipart/form-data'
        ),
    ));