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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