Subject: Re: overriding attribute access
Newsgroups: gmane.comp.web.dojo.devel
Date: 2008-04-08 00:29:06 GMT (34 weeks, 2 days, 2 hours and 42 minutes ago)
AFAICT, this Observable is related to: http://alex.dojotoolkit.org/08/jscript/lettable.html and I share similar performance concerns. Instead of wrapping, my thought here would be to create special- purpose objects which are properties of classes. For instance, you might have: myWidget.fields.isEnabled = true; or maybe shortened to: myWidget.f.isEnabled = true; And a getter/setter would be available on that property of that object to take an (over-rideable) default action. Such special-case objects would be subject to the performance concerns we're all worried about here, but they could be more easily constrained in use and their "special-purposeness" might not hurt us so much. That said, burying things one more level deep on a class poses its own problems. Fundamentally, being able to say something like: myWidget.f.label = "some text"; and have it instantly set the innerHTML of the widget's labelNode property would be a HUGE win for widget authors. I think we should do some profiling here before shooting down the VBScript proxy idea entirely. If it does pan out for constrained use- cases, we can certainly consider moving dojo.data item value lookup and setting out to these Observeable/Lettable frankensteins. Regards On Apr 7, 2008, at 7:36 AM, Jared Jurkiewicz wrote: > I second Trenka's comment about performance implications. Creating > wrapper objects in IE seems very scary/performance inhibiting. Isn't > this effectively the same thing as the 'lettable' idea Alex was > talking about some few weeks back? > > -- Jared > > > On Mon, Apr 7, 2008 at 10:32 AM, Bill Keese <bill <at> dojotoolkit.org> > wrote: >> Kris Zyp wrote: >>> Observable creates a new object (a >>> vbscript) that "wraps" the original. >> >> Uh oh, so that means we would need to resurrect the createWidget() >> factory method? >> >> >> _______________________________________________ >> dojo-contributors mailing list >> dojo-contributors <at> dojotoolkit.org >> http://dojotoolkit.org/mailman/listinfo/dojo-contributors >> > _______________________________________________ > dojo-contributors mailing list > dojo-contributors <at> dojotoolkit.org > http://dojotoolkit.org/mailman/listinfo/dojo-contributors -- Alex Russell alex <at> sitepen.com A99F 8785 F491 D5FD 04D7 ACD9 4158 FFDF 2894 6876 alex <at> dojotoolkit.org BE03 E88D EABB 2116 CC49 8259 CF78 E242 59C3 9723