Now almost there. I'm understanding the use of models much better now.
I have created my own simple SeachModel class to holds Strings for each
selected dropdown choice. In my custom session I wrap my model like:
CompoundPropertyModel searchModel = new CompoundPropertyModel(new
SearchModel());
Then in my search page I can now do:
DropDownChoice countryDDC = new DropDownChoice("country",
new PropertyModel(model, "country"), new Model() {
public Object getObject() {
SearchModel sm = (SearchModel) model.getObject();
String area = sm.getArea();
List<String> countries =
areaManager.getCountryLabel(area);
return countries;
}
})
and everthing gets stored to and from the session automatically.
I have overriden the default choice so my options always have the correct
null values, eg:
protected CharSequence getDefaultChoice(Object selected) {
return "<option value=\"\">All countries</option>";
}
Only one problem still to solve - the one where if I select an area +
country + region combo - eg, N America - USA - Alabama, then change to a top
level area where the first country has no regions - eg, Africa - Alegeria -
the region dropdown sticks as the previously stored Alabama. If I submit
the form, then the region dropdown gets reset OK - it's just not clearing
with the AJAX update to the country dropdown.
Steve
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