Subj : Object properties that dont yet exist?
To   : netscape.public.mozilla.jseng
From : genisiob@pilot.msu.edu (Brian)
Date : Tue Oct 07 2003 08:19 am

Hello all,

In Mozilla, if I run the following script, it works:

document.somejunk = 5;
alert(document.somejunk);

How does this work?  The somejunk property of document surely was not
defined in their model, yet the variable obviously gets added as a
property of document for access.

I am implementing a javascript model where I want the same thing to
happen... I want to have access to properties that I have not
explicitly defined.

Now, if my object is something like this:

Foo = { int junk; int bar }

and a user sets Foo.somejunk, my error handler gets triggered, and the
script aborts.

Instead, I want to have a catchall for the object, where I can store
somejunk as a property.  Likewise, I want to catch somejunk as a
property when it is being accessed, look up the value, and return
it... much like the browser does.

How is this done?
Thanks,
Brian

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