Catching a JSONP error on a cross-domain request

Question

I'm using jQuery.getJSON() on a URL (different domain) which may not exist. Is there a way for me to catch the error "Failed to load resource"? It seems that try/catch doesn't work because of the asynchronous nature of this call.

I can't use jQuery.ajax()'s "error:" either. From the documetation:

Note: This handler is not called for cross-domain script and JSONP requests.

Answer 1

If you have an idea of the worst case delay of a successful result returning from the remote service, you can use a timeout mechanism to determine if there was an error or not.

var cbSuccess = false;
$.ajax({
   url: 'http://example.com/.../service.php?callback=?',
   type: 'get',
   dataType: 'json',
   success: function(data) {
              cbSuccess = true;
            }
});
setTimeout(function(){ 
        if(!cbSuccess) { alert("failed"); } 
    }, 2000); // assuming 2sec is the max wait time for results