Subj : Re: JavaScript problem
To   : netscape.public.mozilla.jseng
From : Adrian Herscu <bmf1972@icqmail.com>
Date : Sun Oct 12 2003 07:29 pm

Brendan Eich wrote:

> Martin Honnen wrote:
> 
>> Well, it is "working" in Mozilla too, only with a different result. 
>> Change your code to
>>
>> var o = new function() {
>>     var This = this;
>>
>>     this.f = function() {
>>         alert( This.f.caller );
>>     }
>> }
>>
>> function g() {
>>     o.f.call(this);
>> }
>> g.p = "hello";
>>
>> g();
>>
>> and you will see what the caller function is, in Mozilla's case it is 
>> the function
>>   call
>> in IE's case it is the function
>>   g
>> so that is why you get a different result (when reading the p property).
>> The caller property is nowhere defined in the ECMAScript edition 3, 
>> indeed there are implementation like Opera 7's ECMAScript 
>> implementation which do not implement caller at all.
>> It is therefore not possible to decide which implementation is right 
>> as the spec doesn't tell.
>>
>> With Mozilla you need to access
>>   This.f.caller.caller
>> if you are looking for the function g.
>>
> 
> Or don't invoke f using call, just call o.f(this) inside g.
> 
> /be
> 

That's the point!
I want o.f() to execute in caller's context and without passing the 
"this" reference as a parameter.

A simplified version:

function f() {
	alert( f.caller.p );
}


function g() {
	f();		// executes in the default context - work
	f.call(this);	// executes in a forced context - doesn't work
}
g.p = "hello";

g();

.