Thankx much. I see a bit better where I was misunderstanding Alex, now. As
to binding....the intent here is loose coupling of the MVC sort. This view
object sends a notification that an item was selected. It's supposed to
store that selectItem to the type defined by the Value Object. I've fallen
victim to the assumption that if it's typed right for the DG it'll be typed
correctly for the form too. They are based on the same VO.
What really puzzles me is the lack of explicit error when the typecast
fails.
Again...i'm in much appreciation for the feedback. It's clear that it's time
to pick up unit testing.
On 2/24/08, Paul Andrews <[EMAIL PROTECTED]> wrote:
>
> Steve, I think Alex has already pointed out the reason you have a
> problem:
>
> selectedItem="{selectedSlide}"
> Remove this line. If you have a panel that contains fields that should be
> bound to the selected item, you need to have the binding there, not as
> above.
>
> Paul
>
> ----- Original Message -----
> *From:* justSteve <[EMAIL PROTECTED]>
> *To:* [email protected]
> *Sent:* Saturday, February 23, 2008 3:20 PM
> *Subject:* Re: [flexcoders] Where did the value go?
>
> Bummer....I was _sure the problem would be the fact that the datagrid
> didn't have columns for all Slide's properties.
>
> But I've since added all Slide's properties to the DG and still the
> argument comes in null. I tried Beau's suggestion to remove the cast from
> the call and type the argument to Object. Still valid at the call and null
> at the argument.
>
> Then I changed event.target.selectedItem as Slide to
> event.target.selectedItem.myIdentity and the functions signature to accept
> a Number. That works...the correct number is being passed to the handler.
> I'm tempted to just code a query to the collection that can build a full
> Slide from the ID property but figure that if I'm not lazy enough to do it
> right what hope is there for my becoming a good programmer.
>
> So clearly the typecasting is misfiring but why no compile _or runtime
> error? I find that if I intentionally misspell the dataField property of one
> of the DG's columns, that column comes up blank but others render as
> expected and, again, no error reported.
>
> On 2/22/08, justSteve <[EMAIL PROTECTED]> wrote:
> >
> >
> > @ Alex...i'm unclear about your questions... I have a datagrid that
> > displays a table of all rows of the given collection. When I select a row
> > that record is supposed to display in a separate - a detail - form.
> >
> > The problem probably traces to the fact that the datagrid doesn't define
> > columns for each of the fields specified in the type 'Slide' - the datagrid
> > has columns representing only a subset of the properties in 'Slide'. But if
> > so, shouldn't that cause either a runtime (if not a compile-time) error?
> >
> > thx to all
> > --steve...
> >
> >
> > On 2/22/08, Alex Harui <[EMAIL PROTECTED]> wrote:
> > >
> > > The DG's selectedItem is bound to selectedSlide so anything that
> > > tickles it will reset the selectedItem. Maybe you want to call
> > > selectSlide(selectedSlide), or maybe you just want to init selectedItem
> > > once
> > > and not have it bound permanently?
> > >
> > >
> > > ------------------------------
> > >
> > > *From:* [email protected] [mailto:[EMAIL PROTECTED]
> > > *On Behalf Of *justSteve
> > > *Sent:* Friday, February 22, 2008 2:06 PM
> > > *To:* flexcoders
> > > *Subject:* [flexcoders] Where did the value go?
> > >
> > >
> > >
> > > I have a datagrid that should send it's selectItem value to a detail
> > > form.
> > >
> > > <mx:DataGrid
> > > selectedItem="{selectedSlide}"
> > > change="selectSlide(event.target.selectedItem as Slide)"
> > > dataProvider="{slides}" >
> > >
> > > Placing a breakpoint on the change property and observing the
> > > event.target.selectedItem value shows the event is carrying the
> > > expected info. But when execution reaches the handler:
> > >
> > > public var selectedSlide:Slide;
> > > private function selectSlide(pSlide:Slide):void
> > > {
> > > selectedSlide = pSlide ; // pSlide is now null.
> > > dispatchEvent(new Event(SELECT, true));
> > > }
> > >
> > > the param is null. How do I go about figuring out where my error is? I
> > > reason that if there's something wrong with how I've typed 'Slide' I'd
> > > get a compile-time error.
> > >
> > > many thankx
> > > --steve...
> > >
> > >
> >
>
>
