Re: Re: Bug in BTable

Hi Tim,

regarding at the nested models stuff, take a look at
org.enhydra.barracuda.contrib.sam.models.IterativeSubModel. 

Let me just point out how to use it. I'll assume your data is organized
in this way:

// item represents the content of one sub-element
class Item {
	String name;
	...
}

class Section {
	String title;
	<any other fields>
	List items; // all items belonging to the Section 
}

So each Section contains a List of Items. In your ControlEventHandler
(here I assume, you are using BTemplateViewHandler), you get a List of
Sections. 

public Object getTemplateModels() {
	List models = new Vector();
	List sections = <call to your business logic>;

	// create the "outer" model for sections
	TemplateModel sectionModel = new IterativeListModel("Section",
sections) {
		public Object getItem(String key) {
			Section section = (Section)_current;
			if ("title".equals(key)) {
				return section.title;
			} else {
				... all other fields of section
			} else if (key=="__REQ_FROM_CHILD") {
				return section.items; 
			}
		}
	};
	models.add(sectionModel);

	// now the "inner" model iterating over the items
	TemplateModel itemModel = new IterativeSubModel("Item",
"__REQ_FROM_CHILD", sectionModel) {
		public Object getItem(Strin key) {
			Item item = (Item)_current;
			if ("name".equals(key)) {
				return item.name;
			} else ... <all other fields of Item>
		}
	};
	models.add(itemModel);
}

So we have added two models, "Section" and "Item". The Item model has a
reference to section. For details how IterativeSubModel works, take a
look at the source.

Your HTML mockup would look like:

<h2 class="Dir::Iterate_Start.Section Dir::Iterate_Next.Section
Dir::Get_Data.Section.title">dummy for section's title</h2>

.... and outher Get_Data's on Section Model
	
  <ul>
    <li class="Dir::Iterate_Start.Item Dir::Iterate_Next.Item
Dir::Get_Data.Item.name">dummy for item's name
    <li class="Dir::Iterate_End.Item Dir::Discard>null
  </ul>

<h2 class="Dir::Iterate_End.Section Dir::Discard">null</h2>

Each section produces a h2 tag and a nested ul. The ul is populated by
the Item model.

I hope this helps.	

Regards,
Stefan



Am Fre, 2003-07-18 um 22.05 schrieb Tim Dysinger:
> Greetings (again),
> 
> How complex have you all pushed the component model?  I noticed an email
> from Jim Dow a while back that asked about build custom components.
> 
> I have a pretty complex couple of screens to build and so far I have not
> had any luck with build a custom component model for them.
> 
> I would like to be able to build the following structure ->
> 
> TemplateModel (page level model)
>   -> BText (title)
>   -> BList (links)
>      -> BLink
>   -> BList (repeating sections)
>      -> BTemplate (section template)
>        -> BText (section title)
>        -> BList (list of stuff for the section)
>          -> BText (stuff)
> 
> -or-
> 
> TemplateModel (page level model)
>   -> BText (title)
>   -> BList (links)
>      -> BLink
>   -> BTemplate (Iterative Model) (repeating sections)
>        -> BText (section title)
>        -> BTemplate (Iterative Model) (list of stuff for the section)
>          -> BText (stuff)
> 
> So far I have been able to manually bind any template model to a view and
> it works great, __but__ if I try to return any BTemplate from a
> TemplateModel it blows chunks.  I have seen tidbits of emails on "Nested
> Directives."  Can anyone point me to any examples/pointers?  It seems that
> you cannot return a BTemplate from a TemplateModel.
> 
> -Tim
> 
> 
> 
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