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Jsf remove tag tutorial


Problem in comment out a JSF tag:

We can html comment

<!-- -->

for commenting a JSF tag. But the problem here is that JSF still process the value expression and tag will appear in generated HTML.

JSF Comment:

<!-- 
    	<h:commandButton type="button" value="#{msg.buttonClickHerel}" />
-->

JSF dataTable:

<!-- 
    	<h:commandButton type="button" value="Click Here" />
 -->

Solution of above problem:

We have two solutions of the above problem.
1. Use facelets.SKIP_COMMENTS in web.xml file and set it to true.

<context-param>
    <param-name>facelets.SKIP_COMMENTS</param-name>
    <param-value>true</param-value>
</context-param>

2. Use ui:remove tag:
JSF ui:remove tag is used to define the content we want to remove.

Example:

test.xhtml

<?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:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core"
	xmlns:ui="http://java.sun.com/jsf/facelets">
<h:body>
	<h2>JSF ui remove example.</h2>
	<ui:remove>
      <h:outputText value="Hello World" />
    </ui:remove>
</h:body>
</html>

faces-config.xml

<?xml version="1.0" encoding="windows-1252"?>
<faces-config version="2.0" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xi="http://www.w3.org/2001/XInclude" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd">
 
</faces-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    	xmlns="http://java.sun.com/xml/ns/javaee" 
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 
    <servlet>
        <servlet-name>faces</servlet-name>
        <servlet-class>
         javax.faces.webapp.FacesServlet
	<servlet-mapping>
        <servlet-name>faces</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
 
</web-app>

URL:

http://localhost:7001/JSFExample48/faces/test.xhtml

Output:

JSF example48-1
 
Download this example.
 

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