Wicket - DropDownChoice from Enum to Primitive

Question

Im having some problem with DropDownChoice. I have an Enum with a list of school title like:

public enum StudyTitle {

    NONE(null,null),ELEMENTARY("1","Elementary"),COLLEGE("2","College");

    private String code;
    private String description;

    private StudyTitle(String code, String description){
        setCode(code);
        setDescription(description);
    }

    [setter and getter]

}

Then I have a Pojo with a String proprerty call "studyTitleCode" where I want to put the code (ex 1 for elementary, 2 for college etc...).

When I create a DropDownChoice Wicket doesn't allow me to have a proprerty Model of type String if the DropDownChoice is of type StudyTitle.

Ex. [building the listOfStudyTitle as ArrayList of Enums]

DropDownChoice<String> studyLevel = new DropDownChoice<String>("id",new PropertyModel<String>(myPojo,"studyTitleCode"),listOfStudyTitle,new ChoiceRenderer<StudyTitle>("description","code"));

Is there a Method to allow Wicket to link one property of the Enum to the Property of Model?

Thanks

score 1 · Accepted Answer · answered Aug 02 '12 at 11:43

The choice options for an AbstractSingleSelectChoice must match the type of the value model. The only related config option for the DropDownChoice that I'm aware of is the IChoiceRenderer which allows you to set how the enum value is rendered (vs the default call toString()).

One option would be, instead of using the enum instance itself for your choices model, give the enum a String property that can be used:

public enum TestEnum {
    ONE ("ONE"),
    TWO ("TWO"), 
    THREE ("THREE");

    private String value;

    TestEnum(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }

    public static List<String> getStringValues()
    {
        List<String> stringValues = new ArrayList<String>();
        for (TestEnum test : values()) {
            stringValues.add(test.getValue());
        }

        return stringValues;
    }
}

@Override
protected void onInitialize() {
    super.onInitialize();

    IModel<String> myStringValueModel = new Model<String>();
    add(new DropDownChoice<String>("id", myStringValueModel, TestEnum.getStringValues()));
}

Your solution is good but the String I want obtain is different from the String I want to show. With my Enum, I want the user see "description" property but I want "code" as the value inside model. — MrMime, Aug 02 '12 at 11:49
If you need to change the value of your model to some display value, you can use DropDownChoice#setChoiceRenderer(IChoiceRenderer). The IChoiceRenderer has an abstract method, getDisplayValue(T), that accepts as it's only parameter the model value. From there, query your enum for the display value... — Daniel Semmens, Aug 03 '12 at 01:42

Wicket - DropDownChoice from Enum to Primitive

1 Answers1