no, it doesnt really help since we cant see the bean that is inside
mySymbol.
as far as the example below:
see the use of loadabledetachablemodel below.
also you are specifying the same model for selection and list of choices,
that makes no sense. if whatever bean inside mySymbol model has a
"categories" property, then see my correction below.
-igor
On 5/18/07, Florian Hehlen <[EMAIL PROTECTED]> wrote:
public class SymbolAddUpdate extends WebPage
{
public SymbolAddUpdate(PageParameters aParams)
{
addFeedback();
addPageTitle("Add/Update Symbol");
CompoundPropertyModel mySymbol = checkNewOrUpdate(aParams,
aParams.getString("theSymbolId"));
final Form myForm = new AddUpdateForm("form.symbol", mySymbol);
add(myForm);
TextField myName = new TextField("name");
final ChoiceOptions myOptions = new LoadableDetachableModel() (
load(){ return theDao.findAllCategoriesAsDto()); }}
final ChoiceRenderer myRenderer = new ChoiceRenderer("name",
"id");
final CategoryChoices myCategories = new CategoryChoices();
DropDownChoice myCat
= new DropDownChoice("categories", myCategories,myRenderer);
[...]
}
I hope this helps.
thanks,
florian
Igor Vaynberg wrote:
if you show me the exact code snippet that doesnt work that will give me
the necessary context.
-igor
On 5/17/07, Florian Hehlen < [EMAIL PROTECTED]> wrote:
>
> Hi,
>
> Thanks for the help... It's starting to make more sense to me although
> still not working. The issue is definitely with the form model. because all
> my sandbox experiments show me that it all goes to hell when i introduce the
> model in the form. My form is a a bean wrapped in a CompoundPropertyModel.
>
> Maybe you can clarify below your explanation in that context.
>
> florian
>
> Igor Vaynberg wrote:
>
> if you type it it looks like this
>
> DDC<T>(String,IModel<T>,IModel<List<T>>,IChoiceRenderer<T>)
>
> the first model is the one that holds the selection, the second is the
> one that holds a list of available choices.
>
> the constructor with a single model:
>
> DDC<T>(String,IModel<List<T>>,IChoiceRenderer<T>)
>
> is used when you use DDC in combination with a compound property model
> on the form, in which case the ddc's id is used as a property expression
> into form's model to determine the selection. there is a great wiki page on
> models.
>
> so try this
>
> myForm.add(new DropDownChoice("select",new Model(),new
> MyChoices(),myRenderer));
>
> this will create a ddc with a null selection. its not practical, because
> to get the selection you have to call ddc.getmodelobject(), but it will
> at least get you going before you decide on what model to use.
>
>
> -igor
>
>
> On 5/16/07, Florian Hehlen < [EMAIL PROTECTED]> wrote:
> >
> > hi,
> >
> > I am new to wicket so I am not sure how simple this issue is.
> >
> > I am creating DropDownChoice components. I want to a) build the the
> > Options from a list of Objects (not primitives) and b) want to render
> > the option id and value as an attribute of the object in the list.
> > this
> > definitly works in the following sample code:
> >
> > public class WicketSandbox extends WebPage
> > {
> > public WicketSandbox()
> > {
> > addPageTitle("Development Sandbox");
> > final Form myForm = new Form("form");
> > add(myForm);
> >
> > final ChoiceRenderer myRenderer = new ChoiceRenderer("name",
> > "id");
> > myForm.add(new DropDownChoice("select",new
> > MyChoices(),myRenderer));
> >
> > }
> > }
> >
> > But as soon as I add an IModel to the form it seems that the
> > DropDownChoice looks up the choices in the form's IModel. I have
> > tried
> > to use the other constructors for the DropDownChoice which require an
> > (String id, IModel model, IModel choices, IChoicerenderer renderer)
> > but
> > I can't figure out what is the difference between the 2 IModel objects
> > that have to be provided. If I provide twice a ref to the same object
> > I
> > get a different error:
> >
> > The expression 'id' is neither an index nor is it a method for the
> > list class java.util.ArrayList
> >
> > this is an improvement because it is accessing the right object and
> > retrieving the list of choices but not extracting the the objects from
> >
> > the list as it does when I use (String id, IModel choices,
> > IChoicerenderer renderer).
> >
> > In all cases if I remove the ChoiceRenderer my web page builds and
> > displays but I see object.toString() values in my drop-downs.
> >
> > Any tips or pointers would be greatly appreciated.
> >
> > Florian Hehlen
> >
> >
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