I'm having problems with catching 403 from $.ajax promise in jQuery v1.x.
The same code
$.ajax({
dataType: 'jsonp',
url: 'http://www.checkupdown.com/accounts/grpb/B1394343/',
type: 'GET'
}).then(function () {
console.log('success', arguments)
}, function () {
console.log('error', arguments)
});
rejects the promise as expected in jQuery v2.x but logs nothing in jQuery v1.x (the promise has readyState == 1).
The examples use 2.1.3 and 1.11.3 jQuery versions respectively.
Why exactly does this happen? Is it solvable for jQuery v1?
They perform differently because in 1.11.x, an error event handler is not attached to the script tag, instead all you have is an onload or onreadystatechange handler.
https://github.com/jquery/jquery/blob/1.11.3/src/ajax/script.js#L57
https://github.com/jquery/jquery/blob/2.1.3/src/ajax/script.js#L44
There is no workaround other than using a timeout or performing the jsonp request yourself.
It's tricky because you're not making a real AJAX request. JSON-P is a hack, and will cause all sorts of problems for you.
If you really want to detect errors reliably, you need to use a real AJAX request.
