cakephp pass select value ajax - ajax

Question

I have two select buttons and want to filter records, when user select any option I have to fire a event and pass the values of buttons to the controller's action. my code is as under
view
<?php echo $this->Form->create('Employee'); ?>
<fieldset>
<div class="pure-control-group">
<?php echo $this->Form->input('designation', array("label" => "Designation",'type' => 'select', 'id'=>'DesignationType','options' => $settings,'empty' => 'select'));?>
<?php echo $this->Form->input('district', array("label" => "District",'type' => 'select', 'id'=>'districtType','options' => $district,'empty' => 'select'));?>
</div>
</fieldset>
<?php echo $this->Form->end();
$this->Js->get('#DesignationType')->event('change',
$this->Js->request(array(
'controller'=>'employees',
'action'=>'getByCategory'
), array(
'update'=>'#success',
'async' => true,
'method' => 'post',
'dataExpression'=>true,
'data'=> $this->Js->serializeForm(array(
'isForm' => true,
'inline' => true
))
))
);
?>
<div id="success"></div>
controller
public function getByCategory(){
$design_id =$this->request->data['Employee']['designation'];
$district_id =$this->request->data['Employee']['district'];
$this->layout = 'ajax';
}
when i click designation then i m able to get the value of designation but not able to get the value of district .And following error occur
Undefined index: district [APP\Controller\EmployeesController.php, line 18]
so, how can i get the value of district;

Answer 1

Try to send the form id in data variable. that is
Try this :
$data = $this->Js->get('#YourFormId')->serializeForm(array('isForm' => true, 'inline' => true));
$this->Js->get('#DesignationType')->event('change',
$this->Js->request(array(
'controller'=>'employees',
'action'=>'getByCategory'
), array(
'update'=>'#success',
'async' => true,
'method' => 'post',
'dataExpression'=>true,
'data'=> $data
))
);