ValuechangedEvent in JSF

[Maks Besida]

I have such a form in jsf 2.0 in which user can change locale:

 <h:form id="form">
                    <h:panelGrid columns="3">
                        #{msg.name}: 
                        <h:inputText id="name" value="#{person.firstName}" required="true"/>
                        <h:message for="name"/>
                        #{msg.surname}:
                        <h:inputText id="surname" value="#{person.surname}" required="true"/>
                        <h:message for="surname"/>
                        <h:commandButton id="button" value="Register" action="#{person.doRegistration}"/>
                    </h:panelGrid>
                    <div align="center">
                        <h:panelGrid columns="2">
                            <h:selectOneRadio value="#{formSettings.locale}" valueChangeListener="#{formSettings.changeLocale}" 
                                              onclick="submit()" immediate="true">
                                <f:selectItem itemLabel="MyLocale" itemValue="uk" />
                                <f:selectItem itemLabel="English" itemValue="en"/>
                            </h:selectOneRadio>
                        </h:panelGrid>
                    </div>
                </h:form>

When user click on radio button to change locale the form submits and validation logic performs and error messages are shown to user. But i don't want error messages to be shown to user while he or she simply change locale. When I delete required="true" from both input fields then user doesn't see the error messages. How can i avoid error messages to be shown to the user?

[Tim Holloway]

By default, all controls on a form are submitted when the form is submitted, and that means that all controls must contain valid properties or the value events won't fire, the backing properties won't update and the action method won't be invoked.

In straight JSF2, you can probably do AJAX, and someday I'll even bother to learn how. In the RichFaces custom tagset, they have an AJAX support tag (a4j:support) that has an option named "ajaxSingle", and when it's set to "true", only the control that's firing that event is posted.