[jQuery] jquery & validation in cakephp

[ZedR]

I am validating form fields on blur event in jquery. How do I validate
more than 1 field in the controller action called from ajax with
$params['form']. Code I m trying is:

//ajax action in controller
 function ajax_validate() {
          Configure::write('debug', 0);

          if($this->RequestHandler->isAjax()) {

              $this->data['User'][$this->params['form']['field']] =
$this->params['form']['value'];

              $this->User->set($this->data);

              if($this->User->validates()) {
                  $this->autoRender = false;
              }
              else {
                 $errorArray = $this->validateErrors($this->User);

                 $this->set('error', $errorArray[$this->params['form']
['field']]);
              }
          }
      }