yii dropDownList populated data dynamically with Javascript posting null values

How do I retrieve the value which is populating data dynamically with Javascript in yii framework? When I post the data it's inserting the database as null

in view

<ul class="birthday">
    <li><?php echo $form->dropDownList($model, 'otherdate',array());?></li>
    <li><?php echo $form->dropDownList($model, 'othermonth',array());?></li>
    <li><?php echo $form->dropDownList($model, 'otheryear',array());?></li>
<script type="text/javascript">
    date_populate("EmailForm_otherdate", "EmailForm_othermonth", "EmailForm_otheryear");

in controller

$model = new EmailForm;
if (isset($_POST['EmailForm'])) {
$model->attributes = $_POST['EmailForm'];
echo $model->otherdate; //value null


Have you added 'otherdate', 'othermonth' and 'otheryear' to the rules of your model?

public function rules() 
    return array(
        array('otherdate, othermonth, otheryear', 'safe'),

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