this should give you an idea
http://wicketinaction.com/2008/09/building-a-smart-entitymodel/
-igor
On Tue, Oct 28, 2008 at 12:27 PM, Gianni Doe <[EMAIL PROTECTED]> wrote:
> I'm starting out with Wicket and following the Wicket In Action examples
> through and I'm a bit stuck on how to make use of a LoadableDetachableModel
> in a drop-down menu situation.
>
> I've got a drop-down menu of countries which is populated from a
> LoadableDetachableModel, this works perfectly but my selected Country is
> then stored in the page as a complete object, I'd like to be able to make
> use of LoadableDetachableModel also for the selectedCountry but I'm not
> clear on where and how I should instantiate it.
> i.e. for the example below where do I put the "new
> LoadableRefDataModel<Country>(selectedCountry);".
>
> I'd appreciate some suggestions, I think I'm getting the hang of the Model
> idea but can't see the wood for the trees at the moment.
>
>
>
> public class LocationSearchPage extends WebPage {
>
> private DropDownChoice<Country> countryChoice;
>
> private DropDownChoice<Location> locationChoice;
>
> private Country selectedCountry;
>
> private List<Location> locations = new ArrayList<Location>();
>
> private Location selectedLocation;
>
> @SpringBean
> private RefDataService refDataService;
>
> public LocationSearchPage() {
>
> Form searchForm = new Form("searchForm") {
> @Override
> protected void onSubmit() {
> //...
> }
> };
> add(searchForm);
>
> ChoiceRenderer countryRenderer = new ChoiceRenderer("description",
> "id");
> IModel<List<? extends Country>> countryModel = new
> LoadableDetachableModel<List<? extends Country>>() {
> @Override
> protected List<Country> load() {
> return refDataService.getCountries();
> }
> };
>
> countryChoice = new DropDownChoice<Country>(
> "country", selectedCountry, countryModel, countryRenderer);
>
> countryChoice.add(new AjaxFormComponentUpdatingBehavior("onchange") {
> protected void onUpdate(AjaxRequestTarget target) {
> this.selectedLocation = null;
> locationChoice.setChoices(new
> ArrayList<Country>(selectedCountry.getLocations()));
> target.addComponent(locationChoice);
> }
> });
>
> ChoiceRenderer locationRenderer = new ChoiceRenderer("description",
> "id");
> locationChoice = new DropDownChoice<Location>(
> "location", new PropertyModel<Location>(this,
> "selectedLocation"), locations, locationRenderer);
> }
> }
>
>
> public class LoadableRefDataModel<T extends RefData> extends
> LoadableDetachableModel {
>
> @SpringBean
> private RefDataService refDataService;
>
> private Class<T> type;
>
> private Serializable id;
>
> public LoadableRefDataModel(Class<T> type, Serializable id) {
> InjectorHolder.getInjector().inject(this);
> this.type = type;
> this.id = id;
> }
>
> public LoadableRefDataModel(T domainObject) {
> super(domainObject);
> InjectorHolder.getInjector().inject(this);
> this.type = (Class<T>) domainObject.getClass();
> this.id = domainObject.getCode();
> }
>
> @Override
> protected T load() {
> return refDataService.load(type, id);
> }
> }
>
>
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