Multiple Dependent Dropdownlist Problem

I made _form.php entry data file using 3 dependent dropdownlist (id_company, id_ledgers, id_ledgers_detail).

id_company update id_ledgers field and id_ledgers field update id_ledgers_detail field.

Here’s my codes.

My View Code:




<div class="column">

	<?php 

	echo $form->labelEx($model,'id_company');

	echo $form->dropDownList($model,'id_company',

		CHtml::listData(Company::model()->sc_cust()->findAll(),'id','deskripsi')

		,array(

			'empty'=>'---Silahkan pilih---',

			'ajax' => array(

				'type'=>'POST',

				'url'=>CController::createUrl('retur_dtl/pilih_nt'),

				'update'=>'#'.CHtml::activeId($model,'id_ledgers'),

			),

		)

	);

	echo $form->error($model,'id_company'); 

	?>

</div>


<div class="row">

	<?php

	echo $form->labelEx($model,'id_ledgers');

	echo $form->dropDownList($model,'id_ledgers'

		,array(

			'prompt'=>'Pilih Pelanggan Dulu',

			'ajax' => array(

				'type'=>'POST',

				'url'=>CController::createUrl('retur_dtl/pilih_prd'),

				'update'=>'#'.CHtml::activeId($model,'id_ledgers_detail'),

			),

		)

	);

	echo $form->error($model,'id_ledgers'); 

	?>

</div>


<div class="row">

	<?php

	echo $form->labelEx($model,'id_ledgers_detail');

	echo $form->dropDownList($model,'id_ledgers_detail'

		,array(

			'prompt'=>'Pilih Penjualan Dulu',

		)

	);

	echo $form->error($model,'id_ledgers_detail'); 

	?>

</div>




Here’s my controller codes:




/**

 * Dependent dropdown pilih NT

 */

public function actionPilih_nt()

{

	$data=Ledgers::model()->findAllBySql('

	SELECT 

		id, 

		CONCAT("NT",IF(IFNULL(nota_a,"")="", faktur, CONCAT(faktur,".",IFNULL(nota_a,""))),"/",YEAR(tanggal)) AS bukti,  YEAR(tanggal) AS tahun

	FROM kup_ledgers 

	WHERE 

		kup_ledgers.type_ledger=3 AND 

		IFNULL(kup_ledgers.pengurang_bayar,0)<IFNULL(kup_ledgers.total_nota_ppn,0) AND 

		kup_ledgers.company='.$_POST['Retur_dtl']['id_company'].' AND

		IFNULL(kup_ledgers.flagl_bastb,0)=0

	UNION ALL

	SELECT 

		id, 

		CONCAT("BASTB",IF(IFNULL(nota_a,"")="", faktur, CONCAT(faktur,".",IFNULL(nota_a,""))),"/",YEAR(tanggal)) AS bukti,  YEAR(tanggal) AS tahun 

	FROM kup_ledgers 

	WHERE 

		kup_ledgers.type_ledger=3 AND 

		IFNULL(kup_ledgers.pengurang_bayar,0)<IFNULL(kup_ledgers.total_nota_ppn,0) AND 

		kup_ledgers.company='.$_POST['Retur_dtl']['id_company'].' AND

		IFNULL(kup_ledgers.flagl_bastb,0)=1

	ORDER BY tahun, bukti

	');

	$data=CHtml::listData($data,'id','bukti');

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

	{

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

	}

}


/**

 * Dependent dropdown pilih Produk

 */

public function actionPilih_prd()

{

	$data=Ledgers_detail::model()->findAllBySql('

	SELECT 

		id, 

		stock

	FROM kup_ledgers_detail

	WHERE 

		ledger='.$_POST['Retur_dtl']['id_ledgers']

	);

	$data=CHtml::listData($data,'id','stock');

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

	{

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

	}

}




The first dropdownlist (id_company) success update second dropdownlist (id_ledgers) but the second dropdownlist failed to update third dropdownlist (id_ledgers_detail).

Can anyone help me find what’s wrong with my code?