Subj : Object caller references
To   : netscape.public.mozilla.jseng
From : Neil Stansbury
Date : Tue Aug 09 2005 08:19 pm

Hi all,

I have a number of objects that require a pointer to the object they 
were created by. This is basically so I can mark a property r/o without 
needing init() methods on the object eg:

Rather than..

function myObj() {
   this.parent = null;
   this.init = function(val) {
     this.parent = val;
   };
}

var obj = new myObj();
obj.init(this);

// Now obj.parent == this


Instead do...

function myObj() {
   this.parent = myObj.caller;
}

var obj = new myObj1();

// Now obj.parent == this


I have two questions:

1) Is this bad JS form - is there a better way?
2) Why does (obj.parent instanceof myObj) return false?


Cheers,

N

.