LoadableDetachableModel for drop-down menu selection
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
LoadableRefDataModelCountry(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 DropDownChoiceCountry countryChoice;
private DropDownChoiceLocation locationChoice;
private Country selectedCountry;
private ListLocation locations = new ArrayListLocation();
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);
IModelList? extends Country countryModel = new
LoadableDetachableModelList? extends Country() {
@Override
protected ListCountry load() {
return refDataService.getCountries();
}
};
countryChoice = new DropDownChoiceCountry(
country, selectedCountry, countryModel,
countryRenderer);
countryChoice.add(new
AjaxFormComponentUpdatingBehavior(onchange) {
protected void onUpdate(AjaxRequestTarget target) {
this.selectedLocation = null;
locationChoice.setChoices(new
ArrayListCountry(selectedCountry.getLocations()));
target.addComponent(locationChoice);
}
});
ChoiceRenderer locationRenderer = new
ChoiceRenderer(description, id);
locationChoice = new DropDownChoiceLocation(
location, new PropertyModelLocation(this,
selectedLocation), locations, locationRenderer);
}
}
public class LoadableRefDataModelT extends RefData extends
LoadableDetachableModel {
@SpringBean
private RefDataService refDataService;
private ClassT type;
private Serializable id;
public LoadableRefDataModel(ClassT 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 = (ClassT) domainObject.getClass();
this.id = domainObject.getCode();
}
@Override
protected T load() {
return refDataService.load(type, id);
}
}
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Re: LoadableDetachableModel for drop-down menu selection
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
LoadableRefDataModelCountry(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 DropDownChoiceCountry countryChoice;
private DropDownChoiceLocation locationChoice;
private Country selectedCountry;
private ListLocation locations = new ArrayListLocation();
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);
IModelList? extends Country countryModel = new
LoadableDetachableModelList? extends Country() {
@Override
protected ListCountry load() {
return refDataService.getCountries();
}
};
countryChoice = new DropDownChoiceCountry(
country, selectedCountry, countryModel, countryRenderer);
countryChoice.add(new AjaxFormComponentUpdatingBehavior(onchange) {
protected void onUpdate(AjaxRequestTarget target) {
this.selectedLocation = null;
locationChoice.setChoices(new
ArrayListCountry(selectedCountry.getLocations()));
target.addComponent(locationChoice);
}
});
ChoiceRenderer locationRenderer = new ChoiceRenderer(description,
id);
locationChoice = new DropDownChoiceLocation(
location, new PropertyModelLocation(this,
selectedLocation), locations, locationRenderer);
}
}
public class LoadableRefDataModelT extends RefData extends
LoadableDetachableModel {
@SpringBean
private RefDataService refDataService;
private ClassT type;
private Serializable id;
public LoadableRefDataModel(ClassT 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 = (ClassT) domainObject.getClass();
this.id = domainObject.getCode();
}
@Override
protected T load() {
return refDataService.load(type, id);
}
}
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Re: LoadableDetachableModel for drop-down menu selection
Thanks Igor, I've already got my entity model LoadableRefDataModel
which is similar to your example and I can see how to make use of this
when I've actually got the entity object or id. My problem is I'm not
clear on how I go about creating the entity model when a value is
selected from my drop-down menu.
private Country selectedCountry;
countryChoice = new DropDownChoiceCountry(
country, selectedCountry, countryModel,
countryRenderer);
In the above example selectedCountry is populated when a value is
selected from the drop-down, what I'd like to do is replace
selectedCountry with a LoadableDetachableModel.
i.e.
private LoadableRefDataModel Country country;
But I can't work out where to put the instantiation code. Is there
some method of DropDownChoice I can override to do this or would I
wrap my entity model in another model, overriding setObject() to
instantiate my entity model.
What would be the recommended way?
-Gianni
On 28/ott/08, at 21:06, Igor Vaynberg wrote:
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
LoadableRefDataModelCountry(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 DropDownChoiceCountry countryChoice;
private DropDownChoiceLocation locationChoice;
private Country selectedCountry;
private ListLocation locations = new ArrayListLocation();
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);
IModelList? extends Country countryModel = new
LoadableDetachableModelList? extends Country() {
@Override
protected ListCountry load() {
return refDataService.getCountries();
}
};
countryChoice = new DropDownChoiceCountry(
country, selectedCountry, countryModel,
countryRenderer);
countryChoice.add(new
AjaxFormComponentUpdatingBehavior(onchange) {
protected void onUpdate(AjaxRequestTarget target) {
this.selectedLocation = null;
locationChoice.setChoices(new
ArrayListCountry(selectedCountry.getLocations()));
target.addComponent(locationChoice);
}
});
ChoiceRenderer locationRenderer = new
ChoiceRenderer(description,
id);
locationChoice = new DropDownChoiceLocation(
location, new PropertyModelLocation(this,
selectedLocation), locations, locationRenderer);
}
}
public class LoadableRefDataModelT extends RefData extends
LoadableDetachableModel {
@SpringBean
private RefDataService refDataService;
private ClassT type;
private Serializable id;
public LoadableRefDataModel(ClassT 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 = (ClassT) domainObject.getClass();
this.id = domainObject.getCode();
}
@Override
protected T load() {
return refDataService.load(type, id);
}
}
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