jQuery getJSON request returning empty on a valid request

Question

I'm trying to grab some JSON from Apple's iTunes JSON service. The request is simple: http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?term=jac&limit=25

If you visit the URL in your browser you will see some well-formed (backed up by jsonlint.com) JSON. When I use the following jQuery to make the request, however, the request finds nothing:

        $("#soundtrack").keypress(function(){
            $.getJSON("http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch",{'term':$(this).val(), 'limit':'25'}, function(j){              
                var options = '';
                for (var i = 0; i < j.results.length; i++) {
                    options += '<option value="' + j.results[i].trackId + '">' + j.results[i].artistName + ' - ' + j.results[i].trackName + '</option>';
                }
                $("#track_id").html(options);
            });
        });

Firebug sees the request, but only receives an empty response.

Any help would be appreciated here, as I'm at my whits end trying to solve it. You can view the script here: http://rnmtest.co.uk/gd/drives_admin/add_drive (soundtrack input box is at the bottom of the page).

Thanks

Answer 1

In order to do cross-domain requests, your going to need to use JSONP. This may help:

$.ajax({
  url: "http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch",
  dataType: 'jsonp',
  data: {'term':$(this).val(), 'limit':'25'}, 
  success: function(j){              
    var options = '';
    for (var i = 0; i < j.results.length; i++) {
      options += '<option value="' + j.results[i].trackId + '">' + j.results[i].artistName + ' - ' + j.results[i].trackName + '</option>';
    }
    $("#track_id").html(options);
  }
});

Answer 2

Or you simply change the url a bit. From

http://ax.phobos.apple.com.edgesuite.net/.../wa/wsSearch"

to

http://ax.phobos.apple.com.edgesuite.net/.../wa/wsSearch?callback=?"

And keep using $.getJSON instead of switching to $.ajax

From the jQuery.getJSON documentation

If the URL includes the string "callback=?" in the URL, the request is treated as JSONP instead.