DropDownList won't POST value by using ajax - yii

Question

I created DropDownList and I'm trying to fill div with content and I know how to do it. But problem is that my dropdown list won't POST value.
This is code from view\index.php
<?php
echo CHtml::dropDownList('parovi', '', $model->dropDownListParovi(), array
(
'class'=>'dropDownListLegloIzaberiPar',
'empty'=>array('-'=>Yii::t('default', 'PAR_UZGOJNI_DNEVNIK_LEZENJA_IZABERI_PAR')),
'ajax'=>array
(
'type'=>'POST',
'url'=>Yii::app()->createUrl('/paruzgojni/ajaxIzlistajLegla'),
'update'=>'#legla',
),
)
);
?>
<div id="legla"></div>
And this is from controller
public function actionAjaxIzlistajLegla()
{
echo $_POST['parovi'];
}
this AjaxIzlistaijLegla action is inside accessRules(). And it's working cause When I replace echo $_POST['parovi']; with echo "Hello"; it works, it updates my div. But I don't know why it won't POST that value from drop down list.
jquery is included in head.

Answer 1

Answer is I should wrap my dropDownList with CActiveForm like this
$this->beginWidget('CActiveForm', array(
'id'=>'par-uzgojni-ispis-legla-form',
));
echo CHtml::dropDownList('parovi', '', $model->dropDownListParovi(), array
(
'class'=>'dropDownListLegloIzaberiPar',
'empty'=>array('-'=>Yii::t('default', 'PAR_UZGOJNI_DNEVNIK_LEZENJA_IZABERI_PAR')),
'ajax'=>array
(
'type'=>'POST',
'url'=>Yii::app()->createUrl('/paruzgojni/ajaxIzlistajLegla'),
'update'=>'#legla',
),
)
);
$this->endWidget();
Because I didn't wrap it, it couldn't POST any data to my controller