JQuery getJSON function

I am using the following code to get the j开发者_如何学Goson feed of a twitter users friends using the twitter api :

var url = "http://twitter.com/statuses/friends/"+twitter_handle+".json?callback=?";

//show ajax loading animation
$('#loading').show();

$.getJSON(url, function(data) {
   //hide ajax loading animation 
   $('#loading').hide();
   //Processing the JSON here
   //...
}); 

This works when the twitter handle is valid.But if it is invalid,i.e. when no such twitter user exists the callback function i defined is not executed, and the ajax loading animation does not get hidden.

So, is there a way i can determine in code whether the request for the json feed is failing,and then hide the loading animation ?

Thank You.

the ccallback can return 2 arguments one of which is a textStatus that you can test against.

$.getJSON(url, function (data, textStatus) {
  // data will be a jsonObj
  // textStatus will be one of the following values: 
  //   "timeout","error","notmodified","success","parsererror"
  this; // the options for this ajax request
}

via: http://docs.jquery.com/Ajax/jQuery.getJSON

You are not catching the error condition. From the example below you can use an if statement or a switch to handle both situations.

http://docs.jquery.com/Ajax/jQuery.getJSON says:

callback (Optional) Function
A function to be executed whenever the data is loaded successfully.

function (data, textStatus) {
  // data will be a jsonObj
  // textStatus will be one of the following values: 
  //   "timeout","error","notmodified","success","parsererror"
  this; // the options for this ajax request
}

Edit Working Example thanks go to jQuery ajax (jsonp) ignores a timeout and doesn't fire the error event.

        var twitter_handle = 'FakePersonx';
        var url = "http://twitter.com/statuses/friends/"+twitter_handle+".json?callback=?";

        $.jsonp({
            type: "GET",
            url: url,
            data: {},
            async:true,
            contentType: "application/json; charset=utf-8",
            dataType: "jsonp",
            success: function(data) {
                alert(data);
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {
                alert('error');
            },
            beforeSend: function (XMLHttpRequest) {
                alert('Before Send');
                $('#loading').show();
            },
            complete: function (XMLHttpRequest, textStatus) {
                alert('Complete');
                $('#loading').hide();
            }
});