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@malsup /jsonp
Created Mar 20, 2009

What would you like to do?
// fn to handle jsonp with timeouts and errors
// hat tip to Ricardo Tomasi for the timeout logic
$.getJSONP = function(s) {
s.dataType = 'jsonp';
// figure out what the callback fn is
var $script = $(document.getElementsByTagName('head')[0].firstChild);
var url = $script.attr('src') || '';
var cb = (url.match(/callback=(\w+)/)||[])[1];
if (!cb)
return; // bail
var t = 0, cbFn = window[cb];
$script[0].onerror = function(e) {
handleError(s, {}, "error", e);
if (!s.timeout)
window[cb] = function(json) {
cbFn = null;
t = setTimeout(function() {
handleError(s, {}, "timeout");
if (cbFn)
window[cb] = function(){};
}, s.timeout);
function handleError(s, o, msg, e) {
// support jquery versions before and after 1.4.3
($.ajax.handleError || $.handleError)(s, o, msg, e);

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pascalpp commented Jan 19, 2012

the clause at line 39 fails for me under jquery 1.7.1. both $.ajax.handleError and $.handleError return 'undefined'. any idea how best to update this to run under jquery 1.7?


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joaobrunoah commented Dec 1, 2014

Above version 1.5 of jQuery, the function $.handleError is undefined. Defining this function solves the problem (solved for me). I'm not aware of a better solution to jsonp.

$.handleError = function(s, xhr, status, e) {
    // If a local callback was specified, fire it
    if ( s.error ) { s.context || window, xhr, status, e );

    // Fire the global callback
    if ( ) {
        (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );

Since my solution must be compatible with IE8, this is a good work-around. But, if you can use $.get, do so.


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ppazos commented Jun 23, 2015

I'm getting an error because the callback name is not set on the URL, it is still "?". The original getJSON function changes that to a random name. I'm using jquery 1.11.0

XMLHttpRequest cannot load http://localhost:8090/ehr/rest/ehrForSubject?subjectUid=&format=json&callback=?. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. The response had HTTP status code 400.

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