Jsf message html tag

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JSF h:message tag is used to render a message for a specific JSF UI Component.

JSF tag:

<h:inputText  id="userName"  size="15" label="UserName" required="true">
</h:inputText>
<h:message for="userName " style="color:red" />

Rendered HTML tag:

<span style="color:red">UserName: Validation Error: Value is required</span>

Attributes of h:message 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 message example.</title>
	</h:head>
<h:body>
	<h3>JSF message example.</h3>
	<h:form>
	<h:panelGrid id="panel" columns="3">
		<h:outputLabel value="UserName" />
		<h:inputText id="username" required="true">
		  <f:validateLength for="username" minimum="5" maximum="15" />
		</h:inputText>
		<h:message for="username" style="color:red" />
		<h:outputLabel value="Password" />
		<h:inputSecret id="password" required="true">
		  <f:validateLength for="password" minimum="5" maximum="10" />
		</h:inputSecret>
		<h:message for="username" style="color:red" />
		<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: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/JSFExample20/faces/welcome.xhtml

Output:

JSF example20-1
Enter UserName and Password with less than 5 characters.
JSF example20-2
Click on Submit button.
JSF example20-3
 
Download this example.