I see that aftersavefunc is called with the server response text (not the HTTP response) after successfunc() returns 'true' and can be used to modify a row in the grid after the update.
errorfunc is called if the ajax request does not have ok status ( this is related as error function in jquery ajax request – see jquery docs)
aftersave function is called when the ajax is ok and data is saved (or not) in the database. This way you can notify users on what is going with the save – succes or not.
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