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Old Version 3

changes.mady.by.user Will Hoover

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New Version 4

changes.mady.by.user John Krasnay

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Code Block
final RadioGroup radioGroup = new RadioGroup("radioGroup");
form.add(radioGroup);

final Radio radio1 = new Radio("radio1");
radioGroup.add(radio1);

TextField foo = new TextField("foo") {
    public boolean isRequired() {
        return Strings.isEqual(radioGroup.getInput(), radio1.getValue());
    }
}
form.add(foo);

DropDownChoice

Normally, you give a list of domain objects to a DropDownChoice. We can check which one was selected with the getConvertedInput() method as follows:

Code Block

public class DocumentType {
    private String name;
    private boolean hasExpiryDate;
    // getters and setters omitted
}

List<DocumentType> allDocumentTypes = ...;

final DropDownChoice ddc = new DropDownChoice("documentType", allDocumentTypes, new ChoiceRenderer("name"));
form.add(ddc);

TextField expiryDate = new TextField("expiryDate", Date.class) {
    public boolean isRequired() {
        DocumentType dt = (DocumentType) ddc.getConvertedInput();
        return dt != null && dt.getHasExpiryDate();
    }
}
form.add(expiryDate);