yii 内置ajax 制作级联省市

表单：

echo CHtml::dropDownList('country_id','', array(1=>'USA',2=>'France',3=>'Japan'), 
array( 'ajax' => 
array( 'type'=>'POST', //request type'url'=>CController::createUrl('currentController/dynamiccities'), //url to call. 
//Style: CController::createUrl('currentController/methodToCall') 
'update'=>'#city_id', //selector to update 
//'data'=>'js:javascript statement' 
//leave out the data key to pass all form values through ))); 
//empty since it will be filled by the other dropdown 
echo CHtml::dropDownList('city_id','', array());

控制器：

public function actionDynamiccities() { 
$data=Location::model()->findAll('parent_id=:parent_id', 
     array(':parent_id'=>(int) $_POST['country_id'])); 
$data=CHtml::listData($data,'id','name'); 
  foreach($data as $value=>$name) { 
    echo CHtml::tag('option', array('value'=>$value),CHtml::encode($name),true); 
   } 
}