CHtml dropDownList Ajax Submit

I added the code to submit the yii form When we select the value from Chtml dropdownlist box.

<div class="search-form" style="display:block">

<div class="wide form">
<?php $form=$this->beginWidget('CActiveForm', array(
	'action'=>Yii::app()->createUrl($this->route),
	'method'=>'get',
)); ?>

<div class="row">
<?php echo $form->labelEx($model,'type'); ?>

<?php 
    $types=array("1"=>"Type1","2"=>"Type2");
    echo $form->dropDownList($model,'type',$types,
        array(
        'onchange'=>CHtml::ajax(array(
                        'success'=>"$('.search-form form').submit()",
                    )),
                    )
    ); ?>

</div>

</div>
</div>