Okay, there's a couple of problems there:
Firstly, setAttribute (and thus the js function hide) only operates on
direct properties of the object passed in, not on anything further up
the prototype chain.
Secondly, setAttribute will create a property (with value null) if it
doesn't already exist when setAttribute is called, so to avoid that
you need to call hide *after* the property has already been set on the
object.
$ rhino
Rhino 1.7 release 2 2009 03 22
js> var hide = function (o, p) {
> java.lang.Class.forName
("org.mozilla.javascript.ScriptableObject")
> .getMethod
("setAttributes",java.lang.String,java.lang.Integer.TYPE)
> .invoke(o, p, new java.lang.Integer(
> org.mozilla.javascript.ScriptableObject.DONTENUM));
> }
js> function Test() {}
js> Test.prototype.doStuff = function() { return 'stuff' }
function () {
return "stuff";
}
js> var obj = new Test()
js>
js> hide(obj, 'doStuff')
js> for (var p in obj) print(p)
doStuff
js>
js> hide(Test.prototype, 'doStuff')
js> for (var p in obj) print(p)
js>
js> obj.a = 1
1
js> for (var p in obj) print(p)
a
js> hide(obj, 'a')
js> for (var p in obj) print(p)
js>
On Jul 21, 11:50 am, Mark Porter <[email protected]> wrote:
> On Jul 20, 10:08 am, Mark Porter <[email protected]> wrote:
>
>
>
>
>
> > On Jul 20, 7:35 am, Martin Blom <[email protected]> wrote:
>
> > > And of course, DONTENUM can be used from JS too:
>
> > > var __dontenum__ = function (o, p) {
> > > java.lang.Class.forName("org.mozilla.javascript.ScriptableObject")
> > > .getMethod("setAttributes", java.lang.String, java.lang.Integer.TYPE)
> > > .invoke(o, p, new java.lang.Integer(
> > > org.mozilla.javascript.ScriptableObject.DONTENUM));
>
> > > }
>
> > > On 07/20/2009 03:19 PM, Rapha wrote:
>
> > > > I'm working on implementing ES5 in Rhino. The Object.defineProperty is
> > > > currently implemented in the CVS version,
> > > > seehttp://www.mozilla.org/rhino/download.html
>
> > > > In the meantime you can add non-enumerable properties from Java, using
> > > > the ScriptableObject.DONTENUM attribute.
>
> > > > On Jul 20, 1:15 am, Mark Porter<[email protected]> wrote:
> > > >> Is there currently a way to define non-enumerable properties from
> > > >> Javascript? Something like ES5's defineProperty? If not, are there
> > > >> future plans to support this?
>
> > Wow, that is exactly what I needed. Thanks Rapha and Martin.
>
> > Rapha, I'll try to follow your blog to keep up with your progress.
>
> > Thanks,
> > Mark
>
> > ------------
> > Myna Server-Side Javascript:http://www.mynajs.org
>
> OK, any idea on how to hide properties on instantiated objects? I
> tried hiding the properties on the prototype, but that has no effect.
> Hiding the property inside the constructor seems to make it null:
>
> var hide = function (o, p) {
> java.lang.Class.forName("org.mozilla.javascript.ScriptableObject")
> .getMethod("setAttributes", java.lang.String,
> java.lang.Integer.TYPE)
> .invoke(o, p, new java.lang.Integer(
> org.mozilla.javascript.ScriptableObject.DONTENUM));
>
> }
>
> function Test (){
> hide(this,"doStuff")
>
> }
>
> Test.prototype.doStuff=function(){ return "stuff"}
>
> new Test().doStuff();
> //TypeError: Cannot call property doStuff in object [object Object].
> It is not a function, it is "object".
>
> Is it possible to make instance functions non-enumerable?
>
> Thanks,
> Mark
>
> ------------
> Myna Server-Side Javascript:http://www.mynajs.org
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