[jQuery] jquery & validation in cakephp

[jQuery] jquery & validation in cakephp


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']]);
}
}
}