On Feb 7, 9:12 pm, Wizz <[EMAIL PROTECTED]> wrote:
> On Feb 7, 4:07 am, RobG <[EMAIL PROTECTED]> wrote:
> > On Feb 6, 8:33 pm, Herr Ernst <[EMAIL PROTECTED]> wrote:
[...]
> > > Car=Class.create({
> > > initialize: function() {
> > > this._class="Car";
> > > }
>
> > It would be better to reference the object itself rather than it's
> > name:
>
> > this._class = Car;
>
> > As far as I know, using an underscore for a property name is intended
> > to indicate a private variable, but _class is public and "class" is a
> > reserved word. Why not just use the public constructor property?
>
> > > });
>
> > > var benz=new Car();
>
> > > //recreated benz
> > > var benzclone=eval("new "+benz._class+"()")
>
> > var benzclone = new benz.constructor();
>
> > > Pretty dirty, isn't it. Or does someone know a better method?
>
> > See above. Alternatively, consider using the features built into the
> > language. Use a normal constructor and the constructor property of
> > objects constructed from it:
>
> > function Car(make) {
> > this.make = make;
> > }
>
> > var benz = new Car('Benz');
> > var fiat = new benz.constructor('Fiat');
>
> > alert(fiat.make);
>
> > --
> > Rob
>
> this is an elaborate example of how you could implement something like
> this...
I think you meant to reply to the OP.
> var Car = Class.create({
> initialize: function(make) {
> this.constructor = 'Car';
See above.
> this.make = make;
> }
>
> });
>
> var Fiat = Class.create(Car, {
>
> initialize: function($super, type) {
> this.constructor = 'Fiat';
> $super('Fiat');
> this.type = type;
> }
>
> });
>
> var panda = new Fiat('Panda');
The question (if I understood it correctly) was how to create an
object from the same constructor as some other object when you don't
know what the original constructor was - i.e. something like:
function makeAnother( obj, args ) {
return another = new obj.constructor( args );
}
--
Rob
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