Returning JSONP from Symfony2 controller using AJAX call

Question

I'm trying to return JSONP from Symfony2. I can return a regular JSON response fine, but it seems as if the JSON response class is ignoring my callback.

$.ajax({
 type: 'GET',
 url: url,
 async: true,
 jsonpCallback: 'callback',
 contentType: "application/json",
 dataType: 'jsonp', 
 success: function(data) 
 { 
 console.log(data);
 },
 error: function() 
 {
 console.log('failed');
 }
 }); 

Then in my controller:

$callback = $request->get('callback'); 
$response = new JsonResponse($result, 200, array(), $callback);
return $response;

The response I get from this is always regular JSON. No callback wrapping.

The Json Response class is here:

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/JsonResponse.php

Answer 1

As the docs says:

$response = new JsonResponse($result, 200, array(), $callback);

You're setting the callback method as the $headers parameter.

So you need to:

$response = new JsonResponse($result, 200, array());
$response->setCallback($callback);
return $response;

Answer 2

The JsonResponse's constructor doesn't take the callback argument. You need to set it via a method call:

$response = new JsonResponse($result);
$response->setCallback($callback);
return $response;