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jQuery's AJAX error function has the following parameters:
error(XMLHttpRequest, textStatus, errorThrown) What's the best cross-browser way to get the response body?
Does this work (reliably in all browsers)?
$.ajax({ error: function(http) { alert(http.responseText); } }); 
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The best way to bubble that error from the server side (using php) to the client side is to send a header through the Ajax request somewhere in the 400's (which is always associated with errors). Once the Ajax request receives this it will trigger your error function.
The A in Ajax stands for asynchronous. That means sending the request (or rather receiving the response) is taken out of the normal execution flow. In your example, $. ajax returns immediately and the next statement, return result; , is executed before the function you passed as success callback was even called.
As of jQuery 1.4.1 you should use:
var json = JSON.parse(xhr.responseText); See http://api.jquery.com/jQuery.parseJSON/.
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