Subj : Re: question about javascript functions
To   : netscape.public.mozilla.jseng
From : Ludovic Delabre
Date : Tue Feb 08 2005 08:43 pm


Béatrice Philippe wrote:
> yes, your example is working !
> but i'm trying to do this in my C++ application, using jsapi. And here is 
> the problem...
Yeah I understood you wanted to play with jsapi but I first needed to 
get your problem... :-p

> 
> I'm interrested in modifying the body of an existing javascript function in 
> its global object.
I just played a bit with jsapi using JS_CompileFunction() to dynamically 
  changes a function at runtime and ... no problem !?
BTW, it also works fine for me without calling deleteProperty()...

> So for the moment, i'm currently trying to delete my old function 'fun1' 
> with 'js_deleteProperty()' in the global object, and then i create a new 
> function with 'js_compileFunction()' method with the same name 'fun1'.
> If my application tries to call the new fun1 with 'js_callFunction..()', 
> it's working. But if the new fun1 function is called by others existing 
> functions, it crashes.
> I think when i try to delete a function fun1 with 'js_deleteProperty()', all 
> functions that referenced this function fun1 are not notified about this 
> change. They don't know fun1 was deleted and replaced by a new fun1 
> function.
 From what I know, there're no hidden reference lying around, everythin' 
is evaluated at runtime (but I might be mistaken?).

> 
> My question is:
> is there any way to change dynamically the body of an existing function in a 
> C++ application, using jsapi ?
> or if no, is there any solution to create a new function that would replace 
> the old one ?

> Thank you very much for your help.
Well I don't know why it doesn't work for you when it works fine for 
me... What are you doing exactly ?

See ya,
Ludovic.

.