How Can I Get Dropdown List Value Inside The Form Through Ajax

i want to get the drop down list value inside the form but it always give 0 what is the problem here

here is my code i have enabled ajax

it always display "select"

<div class="row">



<?php echo $form->labelEx($model,'Merchant or Brand',array('style'=>'display:inline','margin-left'=>"20px")); ?>



<?php echo CHtml::activeDropDownList($model,'merchant',Merchant::model()->Merchant,array('id'=>'merchant')); ?>



<tr id="merchantcity">





				echo "select";


				echo "other";