The solution is to nest the ListViews:
Markup:
<select wicket:id="selectId">
<wicket:container wicket:id="optGroups">
<optgroup wicket:id="optGroup">
<wicket:container wicket:id="options">
<option wicket:id="option"></option>
</wicket:container>
</optgroup>
</wicket:container>
</select>
Code:
Select select = new Select(selectId);
select.add(new ListView("optGroups", transList) {
@Override
protected void populateItem(ListItem item) {
MyBean myBean = (MyBean) item.getModelObject();
item.add(new OptGroup("optGroup", myBean.getName(), MyBean.getList()));
}
});
add(select);
class OptGroup extends SelectOption {
String label;
List<MyBean2> list;
public OptGroup(String id, String label, List<MyBean2> list) {
super(id);
this.label = label;
this.list = list;
init();
}
@SuppressWarnings("unchecked")
private void init() {
this.add(new ListView("options", list) {
@Override
protected void populateItem(ListItem item) {
MyBean2 myBean2 = (MyBean2) item.getModelObject();
item.add(new CustomSelectOption("option",
myBean2.getName()));
}
});
}
protected void onComponentTag(final ComponentTag tag) {
checkComponentTag(tag, "optgroup");
Select select = (Select) findParent(Select.class);
if (select == null) {
throw new WicketRuntimeException(
"OptGroup component ["
+ getPath()
+ "] cannot
find its parent Select. All OptGroup components must be
a child of or below in the hierarchy of a Select component.");
}
tag.put("label", label);
}
}
public class CustomSelectOption extends SelectOption {
@SuppressWarnings("unchecked")
public CustomSelectOption(String id, String displayValue) {
super(id, new Model(displayValue));
}
protected void onComponentTagBody(final MarkupStream markupStream, final
ComponentTag openTag) {
replaceComponentTagBody(markupStream, openTag,
getDefaultModelObjectAsString());
}
}
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