Symfony ajax form need reload page to show results - ajax

Question

I have a product page where users can write comments, this works fine but i would like to implement ajax form with no page refresh.
The code call ajax and persist, but need press f5 to show new comment.
what am I doing wrong?
Thanks, and sorry for my english.
In product view, render a controller that call the form:
<div class="comments">
{{ render(controller('AppBundle:Comment:newComment',{'media': selected.id})) }}
</div>
Controller:
class CommentController extends Controller
{
/**
* #Route("/media/{media}/", name="create_comment", options={"expose"=true})
* #Method("POST")
* #ParamConverter("media", class="AppBundle:Media")
*/
public function newCommentAction(Request $request, $media)
{
$comment = new Comment();
$form = $this->createForm(CommentType::class, $comment);
$form->handleRequest($request);
if($form->isSubmitted() && $form->isValid()){
$data = $form->getData();
$data->setUser($this->getUser());
$data->setMedia($media);
$em = $this->getDoctrine()->getManager();
$em->persist($data);
$em->flush();
return new JsonResponse('Success!');
}
return $this->render('comment/newComment.html.twig', array(
'media' => $media,
'form' => $form->createView()
));
}
}
newComment.html.twig
<form method="POST" id="commentForm" action="{{path('create_comment', {'media': media.id})}}">
{{ form_row(form.comment) }}
<button type="submit" id="submitButton" class="btn btn-xs btn-danger">{{ 'btn.send' |trans }}</button>
app.js
$('body').on('click','#submitButton', function(e){
e.preventDefault();
var $form = $('#commentForm');
$.ajax({
type: "POST",
dataType: "json",
url: 'http://demo/app_dev.php/media/16/',
data: $form.serialize(),
cache: false,
success: function(response){
$(".ajaxResponse").html(response);
console.log(response);
},
error: function (response) {
console.log(response);
}
});
});

Answer 1

This should work for you to reload the element with class="comments" after your POST:
$('#submitButton').on('click', function (e) {
e.preventDefault();
var $form = $('#commentForm');
$.ajax({
type: "POST",
dataType: "json",
url: 'http://demo/app_dev.php/media/16/',
data: $form.serialize(),
cache: false,
success: function (response) {
$('.comments').load(window.location + ' .comments > *');
console.log(response);
},
error: function (response) {
console.log(response);
}
});
});
Edit:
As far as your second question regarding $request->isXmlHttpRequest() -- this method just looks for the X-Requested-With header with value of XMLHttpRequest. Are you testing for it on the first request or on the second request or on both requests? Can you take a look in Firebug or Chrome Tools and see if the header is on both requests?