Using enums as model object in Wicket

Question

To use an Enum class in a PropertyModel you can write:

new PropertyModel(MyObject, "MyEnumClass");

Now this only works if MyEnumClass is defined within the MyObject-class.

How can I use a stand-alone Enum-class in a model?

Edit: I concretize:

RadioGroup<MyEnum> rg = new RadioGroup<MyEnum>("radioGroupID", new Model<MyEnum>(MyEnum.NORMAL));

rg.add(new Radio<MyEnum>("radioNormal", new Model<MyEnum>(MyEnum.NORMAL)));
rg.add(new Radio<MyEnum>("radioSpecial", new Model<MyEnum>(MyEnum.SPECIAL)));

The problem here is that changing the radio button doesn't change the model on the RadioGroup.

Answer 1

I've been using the following without a problem for my Enum "NMRType" DropDownChoice component:

IModel<NMRType> default = Model.of(NMRType.HNMR);
List<NMRType> choices = Arrays.asList(NMRType.values());
DropDownChoice<NMRType> nmrDDC = 
    new DropDownChoice<NMRType>("nmrType", default, choices);

Just a note: Be careful not to write to your Enum models.. Wicket uses reflection, which might throw up a few surprises if you do..

Answer 2

I just found the problem: I was using AjaxEventBehavior on my RadioGroup instead of AjaxFormChoiceComponentUpdatingBehavior.

This fixed the model updating problem for my code in the question.