Here is some code of a possible solution:
public class DropDownChoiceForString<T> extends DropDownChoice<T> {
private IModel<String> targetModel;
public DropDownChoiceForString(String id, IModel<T> model, IModel<String>
targetModel, List<? extends T> choices,
IChoiceRenderer<? super T> renderer) {
super(id, model, choices, renderer);
this.targetModel = targetModel;
}
protected DropDownChoiceForString(String id, IModel<T> model,
IModel<String> targetModel) {
this(id, model, targetModel, Collections.<T> emptyList(), null);
}
@Override
protected void onInitialize() {
super.onInitialize();
// load the initial choice.
setModelObject(convertChoiceIdToChoice(targetModel.getObject()));
}
@Override
protected void onDetach() {
super.onDetach();
targetModel.detach();
}
@Override
protected void onModelChanged() {
super.onModelChanged();
T newSelection = getModelObject();
int choiceIndex = getChoices().indexOf(newSelection);
// update the string source with the selected value.
targetModel.setObject(getChoiceRenderer().getIdValue(newSelection,
choiceIndex));
}
}
> Hi,
>
> I needed something similar in a couple of projects. One solution is to
> create a custom DropDownChoice which takes also the string model to
> update. Then you can override onModelChanged to update the string
> model with the new value that can be extracted with the ChoiceRenderer.
>> To make this easier to understand, let's say that I have a list of state
>> abbreviations for example AL, AK, AZ, AR etcetera (the actual example
>> has
>> two letter abbreviations also, but much longer names). I need a
>> DropDownChoice that shows the abbreviations for selection (e.g., AK) but
>> will show the full name as a tooltip whenever the mouse hovers over
>> one of
>> the choice (e.g., AK shows Alaska).
>>
>>
>> I have developed a solution that is based on the example presented here:
>> http://stackoverflow.com/questions/12234738/wicket-dropdownchoice-titles-too
>>
>> ltips-for-options
>>
>> that develops a subclass of DropDownChoice and overrides
>> appendOptionHtml
>> to append a "title" to the buffer. My class takes a StateDisplay
>> object as
>> its model, and the model has two fields, an "id" that is displayed in
>> the
>> list, and a "fullName" which is added as the title by the
>> appendOptionHtml
>> method.
>>
>>
>> This works fine for displaying thedropdown with the tooltip, but the
>> problem is that the model is a complex object( StateDisplay) with two
>> fields, but the underlying domain object needs a simple String with the
>> state ID.
>>
>>
>> Prior to implementing the tooltip, the DrowdownChoice was formed using:
>>
>>
>> Item.add(new DropDownChoice<String>("state", new
>> PropertyModel<String>((CompanyDTO) item.getDefaultModelObject(),
>> "state"),
>> stateList)));
>>
>>
>> Note: "item "is there because this is used in the populateItem method
>> of a
>> ListView.
>>
>>
>> Now the code is:
>>
>>
>> Model< StateDisplay > selectedState = new Model<>();
>>
>>
>> ChoiceRenderer<StateDisplay> choiceRenderer = new
>> ChoiceRenderer<ModifierDisplayDto>("id", "id");
>>
>>
>> Item.add(new StateDropDownChoice< StateDisplay >("state", selectedState,
>> stateList, choiceRenderer));
>>
>>
>> After the selection is made the model (selectedState) is set to the
>> chosen
>> StateDisplay, but there is no easy way to the simple String value set on
>> the CompanyDTO.
>>
>>
>> How can I make the dropdown selection update the domain model's simple
>> String.
>>
>>
>> Thanks
>>
>> Bruce
>>
>>
>
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