setRequired(value) on the fly

Vaadin 6 / 7 / 8 Framework UI
1

I have a form with two dependent field.
If one field changes, it can change the required state of the other.
I try to change state setRequired(value) in the ValueChangeListener, the red asterisk does not appear / disappear above the field. If I change the style, it changes the view, but setRequired does not. Why?

2

What kind of field components do you use? And can you share your code?

3

Hi Anastasia,

It seems my problem related to CustomLayout I use in my form.
If I use VerticalLayout etc. the required mark visible.
With CustomLayout only when I refresh the whole page, changes the view state.
When I set a style to my field, the style is added immediately to the view.

Here is my test code:

final ComboBox cb1 = new ComboBox("C1", Arrays.asList("A","AA"));
cb1.setNullSelectionAllowed(false);
cb1.setValue("A");
cb1.setRequired(true);
final ComboBox cb2 =  new ComboBox("C2", Arrays.asList("B","BB"));
CustomLayout layout = new CustomLayout();
layout.setTemplateContents("<div location=\"cb1\"></div><div location=\"cb2\"></div>");
layout.addComponent(cb1, "cb1");
layout.addComponent(cb2, "cb2");
final Window w = new Window("Required state change test", layout);
w.setWidth("400px");
w.setModal(true);
w.center();
cb1.addValueChangeListener(new Property.ValueChangeListener() {

    @Override
    public void valueChange(Property.ValueChangeEvent event) {
        System.out.println(cb1.getValue());
        cb2.setRequired("AA".equalsIgnoreCase(cb1.getValue().toString()));
        System.out.println(cb2.isRequired());
    }
});
UI.getCurrent().addWindow(w);
4

This seems to be reason: https://dev.vaadin.com/ticket/19827
Hard to validate fields in a CustomLayout, if the caption doesn’t updating.
Can anybody suggest a workaround to update caption in a CustomLayout?