how to call cross-domain web api using ajax?

Question

jQuery.ajax({
           type: "GET",
           url: 'http://example.com/restaurant/VeryLogin(username,password)',
           dataType: "json",

           success: function (data) {
               alert(data);
           },
           error: function (XMLHttpRequest, textStatus, errorThrown) {
               alert("error");
           }
       });

it alerts success, but data was null. The url returns xml data, if we specify the dataType we can get the json data,but here it was not getting any data.

Any help appreciated.

Answer 1

Javascript is subject to the same domain policy. This means for security a JS Script in a client browser can only access the same domain as it came from.

JSONP is not subject to the same restrictions.

Check the jQuery docs on JSONP here:

http://api.jquery.com/jQuery.getJSON/

Here is a working example of using JSONP to access a cross-domain service via JQuery AJAX:

http://jsbin.com/idasay/4

And just in case JSBIN deletes this paste in the future:

jQuery.ajax({
     type: "GET",
     url: 'http://api.geonames.org/postalCodeLookupJSON?postalcode=6600&country=AT&username=demo',
     dataType: "jsonp",
     cache: false,
     crossDomain: true,
     processData: true,


     success: function (data) {
         alert(JSON.stringify(data));
     },
     error: function (XMLHttpRequest, textStatus, errorThrown) {
         alert("error");
     }
 });