JSONP not receiving any callback?

Question

Trying to make a JSONP request to yellowapi (Yellow Pages), even specifying a callback is giving me the "invalid label" error. Here is what I have so far:

$.ajax({
dataType: 'jsonp',
 cache : false,
 url: "http://api.sandbox.yellowapi.com/FindBusiness/",
 data : "apikey="+testingPurposes+"&what="+what+"&where="+where+"
    &fmt=JSON&pgLen=1&UID=127.0.0.1&callback=?",
 success: function (data) {
   alert(data)
 }
});

It returns the right result in JSON format, but it doesn't have the "json12345678" callback at the start. Giving me an "invalid label" error.

What are my options to fix this?

P.S. All the variables are defined, apikey will be removed later.

Answer 1

If it doesn't have the callback at the start, it would be an issue with the API you are consuming, not an issue with your code. Have you confirmed it supports JSONP?

Answer 2

The docs say that the the supported formats are json and XML, not jsonp. You may then have trouble consuming this data due to cross-site scripting restrictions built into browsers. (When I've had to do this kind of thing before I usually generate a proxy service on my own server that makes the requests to the yellowapi.com from PHP, as PHP doesn't have those cross-site restrictions)