Facelets template reuse with conditionally displayed components

StackOverflow https://stackoverflow.com/questions/17681935

Question

How could I reuse the included jsf template that would display more/less data

For example I have main.xhtml which includes the child.xhtml

child.xhtml as below

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:rich="http://richfaces.org/rich"
      xmlns:a4j="http://richfaces.org/a4j"  xmlns:c="http://java.sun.com/jstl/core" xmlns:s="http://jboss.com/products/seam/taglib">
<body>
<h:outputText value="One"></h:outputText>
<h:outputText value="Two"></h:outputText>
<h:outputText value="Three"></h:outputText>
<h:outputText value="Four"></h:outputText>
</body>
</html>

The current implementation of child.xhtml displays "One","Two","Three" and "Four". I want to include the above child.xhtml somewhere else where it should only display "Two" and "Four".

Was it helpful?

Solution

First of all, this is not a valid include file syntax. You're duplicating XML prolog, HTML doctype, <html> and <body> tags. This would only end up as illegal HTML syntax in the final output in webbrowser.

Fix it accordingly:

<ui:composition
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
>
    <h:outputText value="One" />
    <h:outputText value="Two" />
    <h:outputText value="Three" />
    <h:outputText value="Four" />
</ui:composition>

See also:

Coming back to your concrete question, in order to conditionally render the components, just make use of rendered attribute. You can parameterize it by passing an <ui:param> to <ui:include>.

E.g.

<ui:composition
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
>
    <h:outputText value="One" rendered="#{empty hide or not hide}" />
    <h:outputText value="Two" />
    <h:outputText value="Three" rendered="#{empty hide or not hide}" />
    <h:outputText value="Four" />
</ui:composition>

which can be used as

<ui:include src="/WEB-INF/includes/client.xhtml">
    <ui:param name="hide" value="#{true}" />
</ui:include>

When <ui:param name="hide"> is omitted, or its value is not true, then they will be shown.

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