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4.3.1. Request Errors Handling To execute your own code on the client in the event of an error during an AJAX request, you must redefine the standard A4J.AJAX.onError method like so: A4J.AJAX.onError = function(req, status, message){ window.alert("Custom onError handler "+message); } This function accepts the following as parameters: req A parameter string of a request that calls an error. status The error number returned by the server. message A default message for the given error. This lets you create your own handler that is called when timeouts, internal server errors and similar occur.