Multiple Select Dependant dropDownList


I was able to create a dependant dropDownList, thanks to this tutorial:

However, I’d like 1st dropDownList to be multiselect. i.e. Second box will display cities that belong to 2 and more countries that were selected in the 1st box. Adding ‘multiple’=>‘multiple’ to options stops Ajax working at all(Firebug shows nothing). Any help is greatly appreciated

ps Controller will be changed to handle arrays. So never mind it for now. I was testing if ajax was working by simply printing ‘hello world’. It didn’t for ‘multiple’=>‘multiple’

Here’s the code if it is of any help:


$user = User::model()->findByPk(Yii::app()->user->id);

echo $dateForm->labelEx($datePickerModel, 'hospitalID');

echo $dateForm->dropDownList($datePickerModel, 'hospitalID', array( 

		CHtml::listData($user->hospitals, 'hospitalID', 'name')),

		//array('multiple'=>'multiple', 'style'=>'width:200px; height:29px;'),

		array('ajax'=> array(






echo $dateForm->errorSummary($datePickerModel);



echo $dateForm->labelEx($datePickerModel, 'locationID');

echo $dateForm->dropDownList($datePickerModel, 'locationID',array());

echo $dateForm->errorSummary($datePickerModel);



public function actionDynamicLocations()


		$data = Location::model()->findAll('hospitalID=:parent_id', array(':parent_id'=>(int) $_POST['DatePicker']['hospitalID']));

		$data = CHtml::listData($data, 'locationID','locationName');

		foreach($data as $value=>$name)


			echo CHtml::tag('option',array('value'=>$value), CHtml::encode($name),true);