CHtml dropDownList Ajax

I added the code for yii dropdownlist to the following actions like Dropdownlist ajax, Ajax response etc

CHtml dropDownList: Ajax

<?php        
/** CHtml dropDownList Ajax**/          
            $type=array("1"=>"Type 1","2"=>"Type 2");
             echo $form->dropdownlist($model,'type',$type,array('empty'=>'Select Type ',
                'ajax'=>array(
                    'type'=>'POST',
                    'url'=>CController::createUrl('user/type'),
                    'data'=>array('typeid'=>'js:this.value'),
                ),
             ));

?>

CHtml dropDownList: Ajax Response(Ex1)

<?php
/** Update After Get Response **/          
            $type=array("1"=>"Type 1","2"=>"Type 2");
             echo $form->dropdownlist($model,'type',$type,array('empty'=>'Select Type ',
                'ajax'=>array(
                    'type'=>'POST',
                    'url'=>CController::createUrl('user/type'),
                    'update'=>'#Update-id',
                    'data'=>array('typeid'=>'js:this.value'),
                ),
             ));       
?>

CHtml dropDownList: Ajax Response(Ex2)

                       
<?php
            $ajax=array();
            $ajax['type']='POST';
            $ajax['url']= $this->createUrl("user/type");
            $ajax['update']='#Update-id';
            $ajax['data']="js:'parentname='+jQuery(this).val()";    
            $value['empty']='Select Type';
            $value['ajax']=$ajax;                                                                 
?>
                        
	<div class="row">
		<?php echo $form->label($model,'type'); ?>
		<?php echo $form->dropDownList($model,'type',$type,$value); ?>
	</div>

CHtml dropDownList: Ajax Response(Ex3)

<?php
/** Update After Get Response **/          
            $type=array("1"=>"Type 1","2"=>"Type 2");
             echo $form->dropdownlist($model,'type',$type,array('empty'=>'Select Type ',
                'ajax'=>array(
                    'type'=>'POST',
                    'url'=>CController::createUrl('user/type'),
                    //'update'=>'#Update-id',
					'update'=>'#'.CHtml::activeId($model, 'type')
                    'data'=>array('typeid'=>'js:this.value'),
                ),
             ));       
?>