I don't think you can add metadata like the bindable property at
runtime, it has to be declared/defined in a class. Using the binding
utils is a way to compensate for not having declared bindable
properties.
Personally I prefer to use VO's and bindable properties, overall a
much cleaner solution than generic objects and the binding utils.
Derrick Grigg
-------------
www.dgrigg.com
--- In flexcoders@yahoogroups.com, "livinginswitzerland"
<[EMAIL PROTECTED]> wrote:
>
> Derrick,
> Thanks again, and once again, you have led me to another
question.
> I'm aware of using the bindable metatag, and also am using the
> binding.utils.bindProperty method to handle some other bindings I
> need manually, but I'm now wondering if i can do the following:
Can
> I create an Object, and as I create properties on that Object,
tell
> the property to be bindable, in ActionScript. I'm assuming the
> metatag tells the compiler to create the necessary watchers, but
it
> would be really nice if that were a property I could set while I'm
> dynamically creating properties of an Object...something like:
>
> var myObj:Object = new Object();
> myObj.publisher = '';
> myObj.publisher.bindable=true;
>
> Using the binding.utils.bindProperty method works great when I
know
> exactly the two locations between which I want to share data, but
it
> isn't as nice as creating a typed class within an ArrayCollection
as
> bindable that you can easily fit into (and broadcast changes to) a
> datagrid.
>
>
> >
> > A typed value object is basically an object that matches to some
> data
> > entity you are working with. You create a class to define the
> entity,
> > give it properites (that are bindable) and then put instances of
> that
> > class into the ArrayCollection instead of non descript Objects
> >
> > ie
> >
> > class BookVO {
> > [Bindable]
> > public var title: String;
> >
> > [Bindable]
> > public var author: String;
> >
> > [Bindable]
> > public var ISBN: String;
> >
> > public function BookVO():void {
> >
> > }
> > }
> >
> > ... and then loop through the results from the webservice and
for
> each
> > item, create a new BookVO, fill in the properties and add that
to
> the
> > ArrayCollection. I imagine you are probably currently doing
> something
> > similiar to
> >
> > var book = new Object();
> > book.author = xmlNode.ItemAttributes.author;
> > book.title = xmlNode.ItemAttributes.title;
> > book.ISBN = xmlNode.ItemAttributes.ISBN;
> >
> > This is certainly very easy to start with, but in the long run
> causes
> > more headaches for a variety of reasons.
> >
> > By using typed objects with bindable properties, it leverages
the
> Flex
> > components awareness of changes in those objects, basically the
> > components listen to the objects for changes, which means you
don't
> > have to manually refresh things when changes happen.
> >
> > Derrick Grigg
> > -------------
> > www.dgrigg.com
> >
> > --- In flexcoders@yahoogroups.com, "livinginswitzerland"
> > <rickgeorge@> wrote:
> > >
> > > Thanks Derrick...
> > >
> > > I had tried invalidateDisplay list, but not
invalidateList..which
> did
> > > it. interesting. when you say typed value objects...can you
> elaborate
> > > on that? I am doing some 'non standard' things, and all of my
> data is
> > > read into an ArrayCollection via a web service, but i'm not
using
> XML
> > > but text instead. Curious if what you are saying regarding
typed
> value
> > > objects is something i'm bumping up against.
> > >
> > > thanks again!
> > >
> > > -rick
> > >
> > > --- In flexcoders@yahoogroups.com, "Derrick Grigg" <dgrigg@>
> wrote:
> > > >
> > > > I think you can use the 'invalidateDisplayList()' or
possibly
> > > > the 'invalidateList()' to refresh your datagrid.
> > > >
> > > > Alternatively, if you use typed value objects in the
> dataProvider any
> > > > changes to those, should automatically be reflected (and
> viewed) in
> > > > the DataGrid if you are using databinding.
> > > >
> > > > Derrick Grigg
> > > > --------
> > > > www.dgrigg.com
> > > >
> > >
> >
>
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