Jsf messages html tag

JSF h:messages tag is used to render all messages for JSF UI Components in current page.

JSF tag:

<h:messages style="color:red;" />

Rendered HTML tag:

<ul style="color:red">
   <li>	UserName: Validation Error: Value is required </li>
   <li>	Password: Validation Error: Value is required </li>
</ul>

Attributes of h:messages tag.

Attribute	Description
id	id for the tag
binding	Reference to the component used in a backing bean
rendered	A boolean value; false would suppress rendering
styleClass	Cascading stylesheet (CSS) class name
for	The component ID whose message is displayed
errorClass	CSS class applied to error messages
errorStyle	CSS style applied to error messages
fatalClass	CSS class applied to fatal messages
fatalStyle	CSS style applied to fatal messages
globalOnly	Instruction to display only global messages. Default: false
infoClass	CSS class applied to information messages
infoStyle	CSS style applied to information messages
layout	Specification for message layout: table or list
showDetail	A boolean that determines whether message details are shown. Defaults are false for h:messages, true for h:message
showSummary	A boolean that determines whether message summaries are shown. Defaults are true for h:messages, false for h:message
tooltip	A boolean to set whether message details are rendered in a tooltip; the tooltip is only rendered if showDetail and showSummary are true
warnClass	CSS class for warning messages
warnStyle	CSS style for warning messages
style	Inline style information
title	A title used for accessibility. Browsers typically create tooltips for the title’s value

Example:

welcome.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:head>
		<title>JSF messages example.</title>
	</h:head>
<h:body>
	<h3>JSF messages example.</h3>
	<h:form>
	<h:panelGrid id="panel" columns="2">
		<h:outputLabel value="UserName" />
		<h:inputText id="username" required="true">
		 <f:validateLength for="username" minimum="5" maximum="15"/>
		</h:inputText>
		<h:outputLabel value="Password" />
		<h:inputSecret id="password" required="true">
		 <f:validateLength for="password" minimum="5" maximum="10"/>
		</h:inputSecret>
		<f:facet name="footer">
		  <h:panelGroup style="display:block;text-align:center">
			<h:commandButton id="submit" value="Submit" />
		  </h:panelGroup>
		</f:facet>
	</h:panelGrid>
	<h:messages style="color:red;margin:10px;" />
	</h:form>
</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-class>
    </servlet>
 
	<servlet-mapping>
        <servlet-name>faces</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
 
</web-app>

URL:

http://localhost:7001/JSFExample21/faces/welcome.xhtml

Output:

JSF example21-1 Enter UserName and Password with less than 5 characters. JSF example21-2 Click on Submit button. JSF example21-3 Download this example.

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