Yii Ajax Update depending dropdown selection - php

Question

I have dropdown list where there are five or six items (here items are services). I used here ajax request which updates the id “package_id” from the URL 'url'=>$this->createUrl('servicePackage'), once I select any service item. Till now, I have done successfully. But I want that ajax should use different URL and update different id i.e. “registrationid” if I select 4th number item, otherwise it should update “package_id”.
Is it possible?
Is it possible?
The form is:
<div class="form-group">
<?php echo $form->labelEx($model,'service_id', array('class' => 'control-label col-lg-4')); ?>
<div class="col-lg-8">
<?php echo $form->dropDownList($model,'service_id',CHtml::listData(Service::model()->findAll(),'id', 'name'),
array(
'class' => 'form-control',
'prompt'=>'Select a Service',
'ajax' => array('type'=>'POST',
'url'=>$this->createUrl('servicePackage'),
'update'=>'#'.CHtml::activeId($model, 'package_id'), // ajax updates package_id, but I want ajax update registration_id if I select item no 4
'data'=>array('service_id'=>'js:this.value'),
)));
?>
</div>
<?php echo $form->error($model,'service_id'); ?>
</div>
<div class="form-group" id="packageid">
<?php echo $form->labelEx($model,'package_id', array('class' => 'control-label col-lg-4')); ?>
<div class="col-lg-8">
<?php
echo $form->dropDownList($model,'package_id',$model->getServicePackage($model->service_id),array(
'class' => 'form-control','prompt'=>'Select a Package',
'ajax' =>
array('type'=>'POST',
'url'=>$this->createUrl('packagePrice'), //url to call.
'update'=>'#price', //selector to update
'data'=>array('package_id'=>'js:this.value'),
)));
?>
</div>
<?php echo $form->error($model,'package_id'); ?>
</div>
<div class="form-group" id="registrationid">
<?php echo $form->labelEx($model,'registration_id', array('class' => 'control-label col-lg-4')); ?>
<div class="col-lg-8">
<?php
$registrants = Registration::model()->findAll();
$data = CHtml::listData($registrants,'id', function($registrants) {
return CHtml::encode($registrants->name.' ('.$registrants->id.')');
});
echo $form->dropDownList($model,'registration_id',$data,
array(
'class' => 'required form-control chzn-select',
'prompt'=>'Select a Registrant',
'ajax' => array('type'=>'POST',
'url'=>$this->createUrl('Order'), //url to call.
'update'=>'#'.CHtml::activeId($model, 'order_id'), //selector to update
'data'=>array('registration_id'=>'js:this.value'),
)
));
?>
</div>
<?php echo $form->error($model,'registration_id'); ?>
</div>