Thanks Uli!
Ulrich Stärk wrote:
>
> Luther Baker schrieb:
>> I have an entity that contains another entity - but this time, the
>> contained
>> entity table is quite finite - say, 10 rows.
>>
>> public class Category
>> {
>> private String name;
>> }
>>
>> public class User
>> {
>> private String firstName;
>> private String lastName;
>> private Category category;
>> }
>>
>> and in this case, I'd like to render firstName, lastName and a DROP DOWN
>> or
>> some type of picker from existing Categories.
>>
>> Would I need to create my own t:form ... and possibly use a t:BeanEditor
>> with a custom drop down/picker -- or is this type of idiom encapsulated
>> in a
>> Tapestry component already?
>>
>> Thanks much,
>>
>> -Luther
>>
>
> Indeed you'll have to create a BeanBlockContribution and contribute it to
> the BeanBlockSource
> service. This contribution tells tapestry where to look for the component,
> that is responsible for
> rendering your type. Additionally you'll have to contribute your type to
> the DefaultDataTypeAnalyzer
> service. That could look something along the lines of
>
> public static void contributeDefaultDataTypeAnalyzer(
> MappedConfiguration<Class, String> configuration)
> {
> configuration.add(Category.class, "category");
> }
>
> public static void
> contributeBeanBlockSource(Configuration<BeanBlockContribution>
> configuration)
> {
> configuration.add(new BeanBlockContribution("category",
> "AppPropertyEditBlocks", "category",
> true));
> }
>
> AppPropertyEditBlocks is the name of a page that contains a component with
> the id "category" that is
> responsible for rendering your category. In your case this would be a
> select component:
>
> @Environmental
> private PropertyEditContext context;
>
> @Component(parameters =
> { "value=context.propertyValue", "label=prop:context.label",
> "model=prop:categoryModel", "encoder=prop:categoryEncoder",
> "clientId=prop:context.propertyId", "validate=prop:validator" })
> private Select category;
>
> @Inject
> private PropertyAccess propertyAccess;
>
> @SuppressWarnings({ "unused", "unchecked" })
> public FieldValidator getValidator()
> {
> return context.getValidator(category);
> }
>
> public PropertyEditContext getContext() { return context; }
>
> public SelectModel<Category> getCategoryModel()
> {
> ...
> }
>
> public ValueEncoder<Category> getCategoryEncoder()
> {
> ...
> }
> with the corresponding .tml:
>
> <div xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
> <t:block t:id="category">
> <t:label for="category" />
> <t:select t:id="category" />
> </t:block>
> </div>
>
> I believe that there is also some information about this on the wiki,
> check it out!
>
> HTH,
>
> Uli
>
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