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Available since OmniFaces 1.0

The <o:validateAllOrNone> validates if at least ALL of the given UIInput components have been filled out or that NONE of the given UIInput components have been filled out.

The default message is

{0}: Please fill out all or none of those fields

For general usage instructions, refer ValidateMultipleFields documentation.

Demo

Please fill out all or none of those fields

Of course, fill out only one or two fields in order to cause a validation fail.

Show message on all invalid fields

Invalidate only the empty fields

Invalidate only the empty fields and show message message only on invalid fields

Demo source code
<h:form>
    <h3>Please fill out all or none of those fields</h3>
    <p>Of course, fill out only one or two fields in order to cause a validation fail.</p>
    <o:validateAllOrNone id="allOrNone" components="foo bar baz" />

    <h:panelGrid columns="3">
        <o:outputLabel for="foo" value="Foo" />
        <h:inputText id="foo" />
        <h:message for="foo" />

        <o:outputLabel for="bar" value="Bar" />
        <h:inputText id="bar" />
        <h:message for="bar" />

        <o:outputLabel for="baz" value="Baz" />
        <h:inputText id="baz" />
        <h:message for="baz" />

        <h:panelGroup />
        <h:commandButton value="submit">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
        <h:panelGroup>
            <h:message for="allOrNone" />
            <h:outputText value="OK!" rendered="#{facesContext.postback and not facesContext.validationFailed}" />
        </h:panelGroup>
    </h:panelGrid>
</h:form>

<h:form>
    <h3>Show message on all invalid fields</h3>
    <o:validateAllOrNone id="allOrNone" components="foo bar baz" showMessageFor="@all" />

    <h:panelGrid columns="3">
        <o:outputLabel for="foo" value="Foo" />
        <h:inputText id="foo" />
        <h:message for="foo" />

        <o:outputLabel for="bar" value="Bar" />
        <h:inputText id="bar" />
        <h:message for="bar" />

        <o:outputLabel for="baz" value="Baz" />
        <h:inputText id="baz" />
        <h:message for="baz" />

        <h:panelGroup />
        <h:commandButton value="submit">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
        <h:panelGroup>
            <h:message for="allOrNone" />
            <h:outputText value="OK!" rendered="#{facesContext.postback and not facesContext.validationFailed}" />
        </h:panelGroup>
    </h:panelGrid>
</h:form>

<h:form>
    <h3>Invalidate only the empty fields</h3>
    <o:validateAllOrNone id="allOrNone" components="foo bar baz" invalidateAll="false" />

    <h:panelGrid columns="3">
        <o:outputLabel for="foo" value="Foo" />
        <h:inputText id="foo" />
        <h:message for="foo" />

        <o:outputLabel for="bar" value="Bar" />
        <h:inputText id="bar" />
        <h:message for="bar" />

        <o:outputLabel for="baz" value="Baz" />
        <h:inputText id="baz" />
        <h:message for="baz" />

        <h:panelGroup />
        <h:commandButton value="submit">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
        <h:panelGroup>
            <h:message for="allOrNone" />
            <h:outputText value="OK!" rendered="#{facesContext.postback and not facesContext.validationFailed}" />
        </h:panelGroup>
    </h:panelGrid>
</h:form>

<h:form>
    <h3>Invalidate only the empty fields and show message message only on invalid fields</h3>
    <o:validateAllOrNone id="allOrNone" components="foo bar baz" invalidateAll="false" showMessageFor="@invalid" />

    <h:panelGrid columns="3">
        <o:outputLabel for="foo" value="Foo" />
        <h:inputText id="foo" />
        <h:message for="foo" />

        <o:outputLabel for="bar" value="Bar" />
        <h:inputText id="bar" />
        <h:message for="bar" />

        <o:outputLabel for="baz" value="Baz" />
        <h:inputText id="baz" />
        <h:message for="baz" />

        <h:panelGroup />
        <h:commandButton value="submit">
            <f:ajax execute="@form" render="@form" />
        </h:commandButton>
        <h:panelGroup>
            <h:message for="allOrNone" />
            <h:outputText value="OK!" rendered="#{facesContext.postback and not facesContext.validationFailed}" />
        </h:panelGroup>
    </h:panelGrid>
</h:form>