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Editorial Team
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Asked: 2026-05-30T01:54:53+00:00

Having this code when running it on firebug, in the console it will show

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Having this code when running it on firebug, in the console it will show invalid label and also my success callback doesn’t fire. after fiddling my way to google about answers i found out that when using jsonp i need to parse the result and also i need to have a callback. Now i’m banging my head against the wall looking for possible answers. Can you help me with this one? THANKS.

    $.ajax( {
        url: 'http://localhost:8732/Service1/data/10',
        type: "GET",
        contentType: "application/json; charset=utf-8",
        dataType: "jsonp",
        processdata:true,
        jsonpCallback: 'mycallback',
        success : function(data) {

           var json = $.parseJSON(data);
           $('#items').html(json);
           alert(json);

        },
        error : function(req, status, ex) {

          alert("Lol" + ex);

        }
        });
      }

Also the alert("Lol"+ex) will prompt LoljQuery16403233689395911671_1329386795307 was not called”

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1 Answer

  1. Editorial Team

    jsonpString

    Override the callback function name in a jsonp request. This value
    will be used instead of ‘callback’ in the ‘callback=?’ part of the
    query string in the url. So {jsonp:’onJSONPLoad’} would result in
    ‘onJSONPLoad=?’ passed to the server. As of jQuery 1.5, setting the
    jsonp option to false prevents jQuery from adding the “?callback”
    string to the URL or attempting to use “=?” for transformation. In
    this case, you should also explicitly set the jsonpCallback setting.
    For example, { jsonp: false, jsonpCallback: “callbackName” }

    jsonpCallbackString, Function

    Specify the callback function name for a JSONP request. This value
    will be used instead of the random name automatically generated by
    jQuery. It is preferable to let jQuery generate a unique name as it’ll
    make it easier to manage the requests and provide callbacks and error
    handling. You may want to specify the callback when you want to enable
    better browser caching of GET requests. As of jQuery 1.5, you can also
    use a function for this setting, in which case the value of
    jsonpCallback is set to the return value of that function

    Code Sample:

    <!DOCTYPE html>
<html>
<head>
  <style>img{ height: 100px; float: left; }</style>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
  <div id="images">

</div>
<script>
$.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?jsoncallback=?",
  {
    tags: "cat",
    tagmode: "any",
    format: "json"
  },
  function(data) {
    $.each(data.items, function(i,item){
      $("<img/>").attr("src", item.media.m).appendTo("#images");
      if ( i == 3 ) return false;
    });
  });</script>

</body>
</html>

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

    Edit : Code 2

    $.ajax({
    url: 'http://server:port/path/to/file',
    type: 'GET',
    dataType: 'jsonp',
    cache: false,
    jsonp: '$callback',
    error: function (x, t, r) { alert(x.response.message); },
    success: function (data) {
        $.each(data.d.results, function (i, val) {
            $("#results").append("<div>" + val.name + "</div>");
        });
    }
});
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