Hello Reader's!,If you want to change User Active / inactive status on click or dropdown change,Then I wrote this blog for you.

first you need to create dropdown box which contain user status 0 for Suspend 1 for active.
Example:

<?php $options = array('1' => 'Activate', '0' => 'Suspend');
echo $this->Form->select('user_status', $options, array('empty'=>false, 'name'=>'data[User][user_status]', 'default'=>$det['User']['user_status'], 'class'=>'ddStatus', 'data-user_id'=>$det['User']['id']));?>

//(user_status) This is a field in database
//Assign name and set the class with user is (array(.Condition.))

//Then create Ajax function which contain user status nd send to controller for updation
//Put this code before </body> tag

<script type="text/javascript">	 
		$(document).on('change', '.ddStatus', function(e) {
			var element = $(this); 
			currentStatus = $(this).val(); //User Current Status
			$.ajax({
				type: 'POST',
				url: '<?php echo Router::url(array('controller'=>'users', 'action'=>'change_user_status'))?>', //change_user_status is a Function in controller
				data: 'user_id='+element.data('user_id')+'&status='+currentStatus,
				success: function(jsonResponse) {
					var response = $.parseJSON(jsonResponse);
					if(response.status != 'success')
					{
						element.val(!currentStatus);
					}
					
					alert(response.message);
					}
				});
			});			
  </script> 

// After done ajax code now create function (change_user_status) in controller

public function change_user_status()
	{
		if(!$this->request->is('AJAX'))
		{
			return $this->redirect(array('controller'=>'users', 'action'=>'home'));
		}
		
		if(!$this->User->save(array('id'=>$this->request->data['user_id'], 'user_status'=>$this->request->data['status'])))
		{
			echo json_encode(array('status'=>'failure', 'message'=>'Unable to update status at the moment.'));
			die;
		}
		
		echo json_encode(array('status'=>'success', 'message'=>'User status updated.'));
		die;
	}