On Jan 14, 2008 8:21 AM, Bret Gregory <[EMAIL PROTECTED]> wrote:
> I think I should provide some of the code since I will trying to achieve
> that you suggested. The menu has the list of MenuItems provided in the
> code. But when it renders I want the component to use the correct
> component based on its type. I saw another message in the forum that
> outputted apples/orange components in this way.
>
> Menu Class:
>
> @Component
> private PageMenuLink _pageMenuLink;
>
> @Component
> private ActionMenuLink _actionMenuLink;
>
> private List<AbstractMenuItem> _menuItems;
>
> private AbstractMenuItem _item;
>
> @SetupRender
> private void initialize() {
> _menuItems = new ArrayList<AbstractMenuItem>();
> PageMenuLink item = new PageMenuLink();
> item.setDisplayName("PageMenuLink");
> item.setPage("start");
There's your problem. I'm surprised that even works, you should be
getting a runtime instantiation error. PageMenuLink is a component,
and Tapestry needs to be the one that instantiates it. That's how
Tapestry rendevous your component class with its component resources
and a lot of other stuff besides. Putting them inside a list is ok,
but you can't instantiate them yourself.
Tapestry could probably identify where you are doing this, and raise
an exception that says "don't do that".
> _menuItems.add(item);
> }
>
> Menu Template:
>
> <t:loop source="menuItems" value="item">
> <t:delegate to="item"/>
> </t:loop>
>
> <t:Block>
> <t:common.nav.pageMenuLink t:id="pageMenuLink"/>
> <t:common.nav.actionMenuLink t:id="actionMenuLink"/>
> </t:Block>
>
> Menu Item:
> PageMenuLink extends AbstractMenuItem
>
>
>
>
> -----Original Message-----
> From: Howard Lewis Ship [mailto:[EMAIL PROTECTED]
> Sent: Monday, January 14, 2008 11:01 AM
> To: Tapestry users
> Subject: Re: _$resources.queueRender($2);
>
> You mentioned "provided dynamically"?
>
> You can't just instantiate components, only Tapestry can do that, once
> it has transformed the class. What you can do is place the
> components,
> in the template, inside a <t:block> element.
>
> On Jan 14, 2008 7:42 AM, Bret Gregory <[EMAIL PROTECTED]> wrote:
> > I am running into a problem with a custom component that I am
> attempting
> > to write. The component is a dropdown menu. Inside the menu there
> are
> > menu items which are components that are provided dynamically. These
> > components are then looped over and each menu item component is to be
> > rendered based on its type. However, I am getting a Null Pointer when
> > attempting to render the individual items. It looks like the
> > transformation of the components adds a render() method to the
> component
> > that defers to the ComponentResources class's queueRender method. But
> > for my Menu Items the resources is null and I am not sure why that is
> > the case.
> >
> > The MenuItem component class extends an Abstract class from the
> > root.base package. This class also looked to be getting transformed
> by
> > tapestry which I didn't expect since it wasn't in the pages or
> > components package. The concrete MenuItem component lives in the
> > root.components.nav package.
> >
> > Any ideas on why the ComponentResources are not available in my Menu
> > Item components?
> >
>
>
>
> --
> Howard M. Lewis Ship
>
> Creator Apache Tapestry and Apache HiveMind
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>
>
--
Howard M. Lewis Ship
Creator Apache Tapestry and Apache HiveMind
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
