To answer my own question in case anybody else has the same problem:
It is not possible out of the box. You have to pass null together with
the other options to RadioChoice
and then set your own ChoiceRenderer which returns the localized value
in the same way as
AbstractSingleSelectChoice.getDefaultChoice() does for DropDownChoice.
To achieve this I pass a reference to the component to the renderer
and then return the localized
value in getDisplayValue(), e.g like this:
String getDisplayValue(Object value) {
if (value != null) {
return value.toString();
} else {
String result =
component.getLocalizer().getStringIgnoreSettings(component.getId() +
".nullValid", component, null, null);
if (Strings.isEmpty(result)) {
result = component.getLocalizer().getString("nullValid", component,
"");
}
return result;
}
}
In order to get a pre-selected null value you have to return
"-1" (AbstractSingleSelectChoice#NO_SELECTION_VALUE)
in getIdValue().
This is kind of a hack for several reasons:
- code from AbstractSingleSelectChoice.getDefaultChoice() is duplicated.
- some magic constants are re-used but unfortunately there are no
constants in Wicket for them
(e.g. ".nullValid" or "-1" for the null ID) or they are not public.
- the renderer keeps a reference to the component it is attached to
On 02.07.2009, at 19:30, Robin Sander wrote:
Hello,
is it possible to get RadioChoice behave more like DropDownChoice
concerning a null value?
Consider a RadioChoice defining a search parameter, e.g. two values
'male' and 'female' and a third one
meaning "doesn't matter".
With a DropDownChoice I could easily use setNullValid(true) and then
define a property <fieldID>.nullValid
which is them used for the null value.
Looking into the source it seems that DropDownChoice always adds
getDefaultChoice() which does the
magic while RadioChoice does not. Can anyone elaborate on this
topic? Is there a workaround?
Background is that I have dozens of enums with property files for
localization and a self-written
EnumChoiceRenderer which does the localization. So if I have a
property of (enum) type Gender
which defines Gender.MALE and Gender.FEMALE I can't easily define a
special "NULL" value
without modifying the enum.
So the only option I see would be to really pass null to the
RadioChoice or to define a special
enum (like GenderWithNull) for any enum I want to use in a
RadioChoice.
regards,
Robin.
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