Subj : Re: Catch-all method
To   : Harry Ohlsen <harryo@qiqsolutions.com>
From : Brendan Eich <brendan@meer.net>
Date : Wed Jul 30 2003 11:15 pm

Harry Ohlsen wrote:

> I'm not sure whether this is something that's in the standard 
> definition of Javascript, but it would be helpful to me if there was a 
> way to catch attempts to call functions that don't exist.  Does Rhino 
> have such a mechanism?
>
> By the way, I realise that I can put the call in a try/catch block, 
> but that's not of use to me, because I'm looking for a generic way to 
> handle this, in code written by end-users (and I don't want them to 
> have to know this is happening).
>
> What I want to do is catch the call, so I can check whether there is a 
> function in an external repository of scripts. If so, I would load it 
> dynamically and re-execute the call.
>
> Hence, it would be important that the code that catches the problem is 
> passed the list of parameters from the original, failed call.
>
> In Ruby this is handled by having a method called method_missing.  I 
> believe, in Smalltalk, it's called no_such_method. 


See http://bugzilla.mozilla.org/show_bug.cgi?id=213482 for the request 
to add such a method to SpiderMonkey.  I don't believe there's an 
equivalent bug for Rhino.

/be

.