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Editorial Team
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Asked: 2026-06-11T05:44:41+00:00

Consider a nested template: Base.xhtml: … <h:outputText value=#{uiParamter}/> <ui:insert name=header/> … etc. Layout.xhtml: <ui:composition

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Consider a nested template:

Base.xhtml:

...

<h:outputText value="#{uiParamter}"/>
<ui:insert name="header"/>

... etc.

Layout.xhtml:

<ui:composition template="Base.xhtml">

    ...

    <ui:insert name="content"/>

    ... etc.

</ui:composition>

When now defining a template client like this:

<ui:composition template="Layout.xhtml">

    <ui:define name="header"> foo </ui:define>
    <ui:define name="content"> foo2 </ui:define>
    <ui:param name="uiParameter" value="foo3"/>

</ui:composition>

does one have to forward the <ui:param> or <ui:define> in the Layout.xhtml to the Base.xhtml template by redefining it. e.g: 

<ui:param name="uiParameter" value="#{uiParameter}">  
<ui:define name="header">
    <ui:insert name="header"/>
</ui:define>

One could also rephrase this question as: “Do template parameters behave cascading?”

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1 Answer

  1. Editorial Team

    The answer is YES. I’ve run the following code on JBoss AS 7.0:

    nest1.xhtml:

        <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:ui="http://java.sun.com/jsf/facelets">
    
    <h:head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title><ui:insert name="title">
                Nested
            </ui:insert></title>
    </h:head>
    
    <h:body>
        <ui:insert name="main" />
        <h:outputText value="#{uiParam}"/>
    </h:body>

</html>

    nest2.xhtml:

    <ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets" template="nest1.xhtml">

    <ui:define name="main">
        <p>Nested templated content.</p>
    </ui:define>
</ui:composition>

    nest3.xhtml:

    <ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets" template="nest2.xhtml">

    <ui:define name="title">Nested Template</ui:define>
    <ui:param name="uiParam" value="ui param value" />
</ui:composition>

    which was rendered as:

    screenshot of jboss output

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