How To Create Dependent Ejuicombobox

i can create a dependent dropdownlist, but with similiar ajax script i can not create a dependent EJuiComboBox. can somebody tell me what went wrong in my code? script below is my progress so far.

by the way, the “'url’=>CController::createUrl(‘tx/serviceWork/GetVehicleByCustomer’)” is working fine, becouse i already test with dropdownlist.

controller : serviceWork




<?php


        public function actionGetVehicleByCustomer() {

            $data = Vehicle::model()->findAll('customer_id=:customer_id', 

                                	array(':customer_id' => (int) $_POST['customer_id']));


            $data = CHtml::listData($data, 'vehicle_id', 'police_number');

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

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

            }

        }    

?>   



view : _form.php





        <?php

            echo '<label class="control-label" for="customer_id">Customer</label> </br>';

            $this->widget('ext.combobox.EJuiComboBox', array(

                'model' => $model,

                'attribute' => 'customer_id',

                'data' => CHtml::listData(Customer::model()->findAll(), 'customer_id', 'customer_name'),

                'options' => array(


                    'onSelect' => CHtml::ajax(array(

                            'type'=>'POST',

                            'url'=>CController::createUrl('tx/serviceWork/GetVehicleByCustomer'),

                            'update'=>'#ServiceWork_vehicle_id', 

                            'data'=>array('customer_id'=>'js:this.value'), 

                        )),                    

                    

                    'allowText' => true,

                ),

                'htmlOptions' => array('style'=> 'float:left;width:90%;'),

            ));

        ?>



before i select customer, this [size="2"]EJuiComboBox below still contain its own data. but after i select customer, this EJuiComboBox data is all gone. so, i think the ajax is working, but i miss something probably.[/size]





        <?php

            echo '<label class="control-label" for="vehicle_id">Vehicle</label> </br>';

            $this->widget('ext.combobox.EJuiComboBox', array(

                'model' => $model,

                'attribute' => 'vehicle_id',

                'data' => CHtml::listData(Vehicle::model()->findAll(), 'vehicle_id', 'police_number'),

                'options' => array(

                    'allowText' => true,

                ),

                'htmlOptions' => array('style'=> 'float:left;width:90px;'),

            ));

        ?>



thank you. :)