Re: [Wicket-user] Dynamic form markup.

[Nick Heudecker]

Okay, the problem is when I'm creating a new Survey.  New Surveys don't have any SurveyElements so the ListView is empty.  When I try to add a Panel to the ListView using a Form Button, the ListView doesn't update on the page.  Here's how I'm trying to do it:

// "elements" is a ListView object initialized earlier.

add(new Button("addAnotherElementButton") {
    protected void onSubmit() {
        elements.modelChanging();
        List<SurveyElement> l = (List<SurveyElement>) elements.getList();
        if (Util.isEmptyOrNull(l)) {
            l = new ArrayList<SurveyElement>();
        }
        elements.removeAll();
        l.add(getSurveyElement(getAddElement()));
        elements.modelChanged();
    }
});

However, this doesn't work.  Any thoughts on what I'm doing wrong?  I read in the ListView Javadoc about the removeAll() call, but I'm not sure when I should be calling that.  Additionally, it's unclear to mean if the ListView has the new ListItem and it's just not rendering, or if the new ListItem isn't being added.