how to get results of my webservice with jsonp? - angularjs

Question

I want to call one of my webservices via jsonp with angularjs.
When i call http://example.com/files?callback=JSON_CALLBACK directly in my browser, i got :
["folder1", "folder2"]
When i call from angularjs with :
$http.jsonp('http://example.com/files?callback=JSON_CALLBACK')
.success(function(data){
console.log(data);
$scope.folders = data;
});
console.log does not appear....
What am i doing wrong ?
Must my webservice return
JSON_CALLBACK(["folder1", "folder2"])
? Should i do it manually in my api ? browser don't do that automatically ?

Answer 1

What you are currently returning (["folder1", "folder2"]) is not valid JSONP. The JSON result must be wrapped by a javascript function call in order to be valid JSONP.
For example, when you use the URL like this:
http://example.com/files?callback=JSON_CALLBACK
Angular will replace the JSON_CALLBACK parameter with an angular function name (created internally), like:
http://example.com/files?callback=angular.callbacks._0
Your server would then need to be able to read that callback parameter and return the result like this:
angular.callbacks._0(["folder1", "folder2"]);
This is not an automatic mechanism, you need to implement that logic on your web server.

Answer 2

Try Using Following code snippet.
(function($) {
var url = 'http://example.com/files?callback=JSON_CALLBACK';
$.ajax({
type: 'GET',
url: url,
async: false,
jsonpCallback: 'jsonCallback',
contentType: "application/json",
dataType: 'jsonp',
success: function(data) {
console.dir(data);
},
error: function(e) {
console.log(e.message);
}
});
})(jQuery);

Answer 3

bmleite was right, I had to implement this logic on my API.
In my example, my server is made with Silex :
public function index()
{
$callback = $this->request->get('callback');
$files = $this->app['file.manager']->getList();
$response = new \Symfony\Component\HttpFoundation\JsonResponse();
$response->setData($files);
$response->setCallback($callback);
return $response;
}
And it works perfectly now. Thank you.