Write the following code in cjuiautocomplete/ajax action
public function actionAjax(){
$request=trim($_GET['term']);
if($request!=''){
$model=Yiidemo::model()->findAll(array("condition"=>"name like '$request%'"));
$data=array();
foreach($model as $get){
$data[]=$get->name;
}
$this->layout='empty';
echo json_encode($data);
}
}