php - Dependent Dropdown internal server error(500) -


i found question in stackoverflow.but getting different error. try trying implement dependent dropdown in yii. values getting database first dropdown. can't resultant output in second dropdown.

controller:

public function actiondynamic(){         $data=stu::model()->findall('sna=:parent_id',                array(':parent_id'=>$_post['sna']));         // var_dump($data);         // exit();      $data=chtml::listdata($data,'branch','branch');     // var_dump($data);     // exit();     foreach($data $value=>$name){         echo chtml::tag('option',                    array('value'=>$value),chtml::encode($name),true);     } }

view:

<div class="row">     <?php echo $form->labelex($model,'sna'); ?>         <?php           $snaarray = chtml::listdata(stu::model()->findall(),'sna','sna');                echo $form->dropdownlist($model,'sna',$snaarray,                         array(                             'ajax' => array(                             'type'=>'post',                             'url'=>ccontroller::createurl('stu/dynamic'),                             'update'=>'#branch')));                 ?>     <?php echo $form->error($model,'sna');       // var_dump($snaarray);     //  exit();     ?> </div>   <div class="row">     <?php echo $form->labelex($model,'branch'); ?>     <?php echo chtml::dropdownlist('branch','', array(), array('prompt'=>'select branch')); ?>     <?php echo $form->error($model,'branch'); ?> </div>

table:

sid int sna varchar(25) branch varchar(5)

i followed link http://www.yiiframework.com/wiki/24/ achieve dependent dropdown

it doesn't show errors. in network tab(f12 key) change first dropdown showing "http://localhost:8080/student/index.php?r=stu/dynamic" 500(internal server error).

please me in advance.

problem here

$_post['sna']

in ajax call post data go in form of yourmodel[property]

ex:  stu['sna'] stu['some_other']

so, in action dynamic $_post['sna'] cannot pick posted value

change:

  $data=stu::model()->findall('sna=:parent_id', array(':parent_id'=>$_post['sna']));

to

  $data=stu::model()->findall('sna=:parent_id', array(':parent_id'=>$_post['stu']['sna']));

or

public function actiondynamic() {     $postvalues=$_post['stu'];             $data = stu::model()->findall('sna=:parent_id', array(':parent_id' =>$postvalues['sna'] ));      $data = chtml::listdata($data, 'sna', 'sna');             foreach ($data $value => $name)     {         echo chtml::tag('option', array('value' => $value), chtml::encode($name), true);     } }

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