models

public function getLists($company_id = ''){
$companye_model = Company::model()->findByPk($company_id);

if($companye_model){
$model = $this->model()->findAll(array(
'condition' => 'pid=:pid',
'params' => array(':pid'=>$companye_model->id),
));
}else{
$model = $this->model()->findAll();
}

if(is_null($model))
return null;

$data = array();
foreach ($model as $key => $value) {
$data[$value->id] = $value->name;
}
return $data;
}

$_form

<div class="row col-xs-8">
<div class="col-xs-2">
<?php echo $form->labelEx($model,'pid'); ?>
</div>
<div class="col-xs-9">
<?php echo CHtml::dropDownList('CompanyProduct[pid]','CompanyProduct[pid]', Company::model()->getLists(), array(
'class'=>'form-control',
'ajax'=>array(
'type'=>'GET',
'url'=>CController::createUrl('/companyProduct/getType'),
'update'=>'#CompanyProduct_typeid',
'data'=>array('mid'=>"js:this.value",'typeid'=>1)

))
); ?>
</div>
</div>


<div class="row col-xs-8">
<div class="col-xs-2">
<?php echo $form->labelEx($model,'typeid'); ?
>
</div>
<div class="col-xs-9">
<?php echo CHtml::activeDropDownList($model,'typeid',ProductType::model()->getLists(),array('class'=>'form-control')); ?>
<?php echo $form->error($model,'typeid'); ?>
</div>
</div>

controller

public function actionGetType($mid){
$results = ProductType::model()->getLists($mid);
foreach ($results as $key => $value) {
echo CHtml::tag('option', array('value'=>$key),CHtml::encode($value),true);
# code...
}
}