ajax json 500,ajax - Handle 500 errors in JSON (jQuery) - Stack Overflow

This JSON request:

$.ajax({

url:jSONurl+'?orderID='+thisOrderID+'&variationID='+thisVariationID+'&quantity='+thisQuantity+'&callback=?',

async: false,

type: 'POST',

dataType: 'json',

success: function(data) {

if (data.response == 'success'){

//show the tick. allow the booking to go through

$('#loadingSML'+thisVariationID).hide();

$('#tick'+thisVariationID).show();

}else{

//show the cross. Do not allow the booking to be made

$('#loadingSML'+thisVariationID).hide();

$('#cross'+thisVariationID).hide();

$('#unableToReserveError').slideDown();

//disable the form

$('#OrderForm_OrderForm input').attr('disabled','disabled');

}

},

error: function(data){

alert('error');

}

})

In certain circumstances will bring back a 500 error in the form of:

jQuery17205593111887289146_1338951277057({"message":"Availability exhausted","status":500});

This however is still useful to me and I need to be able to be able to handle this correctly.

For some reason though, when this 500 error is returned, my error function is not called and I just get a "NetworkError: 500 Internal Server Error" error in firebug.

How can I handle this?