Subj : Re: question about javascript functions
To   : netscape.public.mozilla.jseng
From : Béatrice Philippe
Date : Mon Feb 14 2005 10:22 pm

Thank you.
i still don't understand why i can't use "evaluateScript()" instead of 
"callFunctionValue()" since i change a javascript function in the global 
object.

Another question : is there any way to get argument names of a each 
javascript function stored in the global object ? i saw i could get the 
number of arguments but no names....

Thanks and good night too !
-- 
Béatrice Philippe-Derbez
"Ludovic Delabre" <nowhere@nomail.lol> a écrit dans le message de news: 
420955b5$0$510$626a14ce@news.free.fr...
> Well if I try from what you gave me, I got:
> Assertion failure: root_points_to_gcArenaPool, at 
> \js-1.5-rc6a\js\src\jsgc.c:972
> Is that it ?
>
> I can get rid of the crash by taking out the call to JS_AddRoot()...
>
> hum... but somehow I got the idea working using "only" JS_CompileFunction 
> ?
> And from what I read from spidermonkey's source, the define property is 
> already done there...  so why all the extra code ?
>
> But maybe I miss somethin'... :-)
>
> And why can't you call evaluateScript() anymore ? Works fine here...
>
> Good night,
> Ludovic
>
> Béatrice Philippe wrote:
>> what i'm doing is :
>> 1. reading each function body
>> 2. if a function contains some javascript statements my app doesn't want, 
>> my app modifies the javascript function body  (that's what i try to).
>>
>> The purpose is :
>> when my app changes the body of a javascript function, this function must 
>> be called everywhere and works.
>>
>> I tried this example  :
>> here are two functions :
>> function fun1() {
>>  var i = 'hello';
>>  return i.toString();
>> }
>>
>> function fun2() {
>>  var j = 'hello from fun2';
>>   var x = fun1();
>>  return x.toString();
>> }
>> somwhere in the html document:
>> <A href=..... onclick="javascript:fun1();".....>
>> if we do : 'js_evaluateScript()' for the onclick event: it works.
>>
>> now, my app wants to change fun1 like this:
>> JSstring aBody = js_decompileFunctionBody(...);
>> char * aBody_char = js_GetStringBytes(...aBody);
>> .... here we change the content of aBody_char....
>> JSFunction *new_fun = js_compileFunction(contextOfGlobalObject, 
>> GlobalObject, aBody_char, strlen(aBody_char),.....);
>>  JSObject * childObject = JS_GetFunctionObject(new_fun);
>>  JS_AddRoot(contextOfGlobalObject,&childObject);
>>
>>  jsval rval = OBJECT_TO_JSVAL(childObject);
>> JSObject *clonedFunc = JS_CloneFunctionObject(contextOfGlobalObject, 
>> childObject, GlobalObject);
>>  JS_DefineProperty(contextOfGlobalObject, GlobalObject, "fun1",
>>                          OBJECT_TO_JSVAL(childObject), nsnull, nsnull,
>>                          JSPROP_ENUMERATE | JSPROP_PERMANENT));
>>
>> here, the function fun1 has been changed. Now, We can' t use 
>> js_evaluateScript() anymore to play the 'onclick' event, but we must use 
>> js_callFunctionValue() (or js_callFunction()) to call fun1 (and for that, 
>> we must know that the onclick event is a function call :-)). This 
>> solution works.
>>
>> BUT: if we want to call fun2 function: it crashes since fun1 has changed 
>> and spidermonkey cannot resolve
>>  "x=fun1()" statement in fun2. Why ????? pointer lost ?
>> if we don't change fun1 body, calling fun2 works well ! strange !!!!
>>
>> Any idea ?
>> Thank you.

.