Dropdownlist Ajax Update Cgridview

Yii 1.1 General Discussion
1

What i want to do is, to get the selected Id from the dropDownList into my criteria of another model.

the dropDownList


<?php echo $form->dropDownList($model,'bereichId', CHtml::listData(Bereich::model()->findAll(), 'id', 'name'),

				array(

			      	'ajax' => array(

			        'type'=>'POST', //request type

			        'url'=>$this->createUrl('Fragen/dynamicFragen'),

 ))); ?>

I don’t know, what to write into the action dynamicFragen. Or even write a javascript funktion.

the Controller Bereichfragen


public function actionCreate()

	{

		$model=new Bereichfragen('search');

		

		$model2=new Fragen('search');

		$model2->unsetAttributes();

		if(isset($_GET['Fragen']))

			$model2->attributes=$_GET['Fragen'];


		if(isset($_POST['Bereichfragen']))

		{

			foreach ($_POST['selectedIds'] as $id)

			{

				  $model=new Bereichfragen();

				  $model->aktiv=$_POST['Bereichfragen']['aktiv'];

		          $model->bereichId=$_POST['Bereichfragen']['bereichId'];

		          $model->fragenId=$id;

		          

		          $model->save();

			}

		}


		$this->render('create',array(

			'model'=>$model,

				'model2'=>$model2,

		));

	}

the Model Fragen


public function searchFragen()

	{

		// Warning: Please modify the following code to remove attributes that

		// should not be searched.

	

		$criteria=new CDbCriteria;

		$criteria->with = array('kategorie');

		$criteria->alias = 'fragen';

		$criteria->addCondition('not exists(

					SELECT * FROM bereich b, bereichfragen bf

					where b.id = bf.bereichId and

					bf.fragenId = fragen.id and

					b.id = 2)'); //put selection here

		

		$criteria->compare('id',$this->id,true);

		$criteria->compare('text',$this->text,true);

		$criteria->compare('kategorieId',$this->kategorieId);

		$criteria->compare('kategorie.name', $this->kategorie_search, true );

Now i want instead of the 2 the selected Id from my dropDownList.

Please help me.