Subj : Binding a global object (again)
To   : netscape.public.mozilla.jseng
From : jjl@pobox.com (John J. Lee)
Date : Sat Aug 30 2003 05:29 pm

I made a second attempt to bind a Python class to the JS global
object.  This time, my getProperty routine isn't getting called to
look up Python attributes on the global object.  Previously, I've got
by just using getProperty and setProperty.  Presumably I need to
provide some other functions -- lookupProperty or hasInstance, maybe?

Looking at the JSObjectOps documentation and jspubtd.h, I'm still left
with these basic questions:

1. What's the difference between getProperty and lookupProperty, and
   when does lookupProperty need to be defined?

2. What's hasInstance for?

What I'm doing is: malloc'ing a JSClass jsclass (I use one per Python
class, to answer your question of a previous post), then:

jsglobj = JS_NewObject(cx, jsclass, NULL, NULL);
JS_InitStandardClasses(cx, jsglobj);


where jsclass has the same setProperty / getProperty functions that I
use for every other bound Python class, but they don't get called when
I evaluate a JS script like "name;" that attempts to access a property
of the global object.  Instead, I get:

ReferenceError: name is not defined


OTOH, if I do this immediately after the JS_NewObject above:

JS_DefineProperty(cx, jsglobj,
                  "window", OBJECT_TO_JSVAL(jsglobj),
                  NULL, NULL, 0);

the script "window.name;" works as expected (and getProperty is called
first for "window", then for "name").

Thanks for any help


John

.