问通过Ajax显示表单

EN

/**
 * Display the message as well as the form to reply to that message
 *
 * @param Request $request
 * @return Response
 */
public function viewMessageAction(Request $request)
{
    //Forbid every request but jQuery's XHR
    if (!$request->isXmlHttpRequest()){
        return new Response('', 200, array('Content-Type' => 'application/json'));
    }

    //Retrieve the message from the request
    $messageId = $request->request->get('messageId');
    $message = $this->getMessageManager->getMessage($messageId);

    //Creates the form to reply to the message
    $form = $this->container->get('reply_form.factory')->create($message);

    if ($request->isMethod('POST')) {
        $form->bind($request);

        if ($form->isValid()) {
            //...
            return $this->redirect($this->generateUrl('task_success'));
        }
    }

    $answer =$this->container->get('templating')->renderResponse('AcmeMessageBundle:Message:message.html.twig', array(
        'form' => $form->createView(),
        'message' => $message
    ));

    $response = new Response();
    $response->headers->set('Content-type', 'application/json; charset=utf-8');
    $response->setContent(json_encode($answer));
    return $response;

}

<script type="text/javascript">
    $(function(){

        var myPath = ;//...

        function getMessage(messageId){
            $.ajax({
                type: "POST",
                url:  myPath,
                data: "messageId="+messageId,
                success: function(returnData){
                    $('#message').html(returnData);
                }
            });
        }

    });
</script>