java - 带有 DropDownChoice 的 Wicket 表单，带有枚举和CompoundPropertyModel

Question

我在使用具有如下下拉选项的 Java Wicket 表单时遇到问题:

public class SomePage extends WebPage { 
    public SomePage () {
        CompoundPropertyModel<SomeBean> properties = new CompoundPropertyModel<SomeBean>(new SomeBean());
        Form<SomeBean> form = new Form<SomeBean>("SomeBeanForm", properties) {
        //override on submit
            };
        form.add(new DropDownChoice<MyEnum>("myEnum", Lists.newArrayList(MyEnum.values()));
        add(form);
    }
}

SomeBean 很简单，如下所示:

public class SomeBean {
    private MyEnum myEnum;
    // Getter, Setter
    public SomeBean(){ 
    }
}

MyEnum 是:

public enum MyEnum { 
    CHOICE1("1"), 
    CHOICE2("2");
    private String id;
    public MyEnum(String id) {
        this.id=id;
    }
    //some methods to get/set/display id
}

我的问题是如何使用CompoundPropertyModel 在bean 中设置枚举？我收到一个异常，例如:

Could not convert value: CHOICE1 to type: MyEnum Could not find compatible converter.

这是由于它不知道如何将任何内容转换为 MyEnum 对象，它需要一个易于创建的转换器，但是如何为由CompoundPropertyModel创建的PropertyModel设置转换器？

感谢您的帮助!

--编辑--

这是一个错误的枚举导入，bean 和下拉选项使用了具有相同名称的不同枚举。这段代码有效。

Answer 1

您的代码不包含实体名称作为组件ID，这就是使用CompoundPropertyModel的原因。

查看 https://repo.twinstone.org/projects/WISTF/repos/wicket-examples-6.x/browse 上的完整代码示例

HTML 片段:

<form wicket:id="form">
    <label>Text</label>: <input type="text" wicket:id="text" /> <br/>
    <select wicket:id="choice"></select>

    <input wicket:id="submit" type="submit" value="Send" />
</form>

代码片段:

final IChoiceRenderer<ChoiceEnum> CHOICE_RENDERER = new ChoiceRenderer<ChoiceEnum>("description");

inal List<ChoiceEnum> ALL_CHOICES = Arrays.asList(ChoiceEnum.values());

final IModel<TextAndEnumBean> model = Model.of(new TextAndEnumBean());
final IModel<TextAndEnumBean> compoundModel = CompoundPropertyModel.of(model);

Form<TextAndEnumBean> form = new Form<>("form", compoundModel);
add(form);

form.add(new TextField<String>("text"));

form.add(new DropDownChoice<ChoiceEnum>("choice", ALL_CHOICES, CHOICE_RENDERER).setNullValid(true));

form.add(new Button("submit"));

实体Bean代码:

public class TextAndEnumBean implements Serializable {

    private static final long serialVersionUID = 1L;

    private String text;

    private ChoiceEnum choice;

    public TextAndEnumBean() {
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public ChoiceEnum getChoice() {
        return choice;
    }

    public void setChoice(ChoiceEnum choice) {
        this.choice = choice;
    }

}

枚举定义代码:

public enum ChoiceEnum {

    CHOICE1("choice no. 1"),
    CHOICE2("choice no. 2"),
    MY_CHOICE("example of my choice"),
    ANTOHER_CHOICE("another choice");

    private final String description;


    private ChoiceEnum(String description) {
        this.description = description;
    }


    public String getDescription() {
        return description;
    }


}