JSF - h:messages


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The h:messages tag shows all the messages at one place corresponding to UI elements.

JSF Tag

<h:messages style = "color:red;margin:8px;" /> 

Rendered Output

Case: Username entered is more than 20 characters and password entered is less than 5 characters.

<ul style = "color:red;margin:8px;"> 
   <li> UserName: Validation Error:  
      Length is greater than allowable maximum of '20' </li> 
   <li> Password: Validation Error:  
      Length is less than allowable minimum of '5' </li> 
</ul> 

Tag Attributes

S.No Attribute & Description
1

id

Identifier for a component

2

binding

Reference to the component that can be used in a backing bean

3

rendered

A boolean; false suppresses rendering

4

styleClass

Cascading stylesheet (CSS) class name

5

for

The ID of the component whose message is displayed, applicable only to h:message

6

errorClass

CSS class applied to error messages

7

errorStyle

CSS style applied to error messages

8

fatalClass

CSS class applied to fatal messages

9

fatalStyle

CSS style applied to fatal messages

10

globalOnly

Instruction to display only global messages, applicable only to h:messages. Default: false

11

infoClass

CSS class applied to information messages

12

infoStyle

CSS style applied to information messages

13

layout

Specification for message layout: table or list, applicable only to h:messages

14

showDetail

A boolean that determines whether message details are shown. Defaults are false for h:messages, true for h:message

15

showSummary

A boolean that determines whether message summaries are shown. Defaults are true for h:messages, false for h:message

16

tooltip

A boolean that determines whether message details are rendered in a tooltip; the tooltip is only rendered if showDetail and showSummary are true

17

warnClass

CSS class for warning messages

18

warnStyle

CSS style for warning messages

19

style

Inline style information

20

title

A title, used for accessibility, that describes an element. Visual browsers typically create tooltips for the title’s value

Example Application

Let us create a test JSF application to test the above tag.

Step Description
1 Create a project with a name helloworld under a package com.tutorialspoint.test as explained in the JSF - First Application chapter.
2 Modify home.xhtml as explained below. Keep rest of the files unchanged.
3 Compile and run the application to make sure business logic is working as per the requirements.
4 Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
5 Launch your web application using appropriate URL as explained below in the last step.

home.xhtml

<!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"> 
   <head> 
      <title>JSF Tutorial!</title> 
   </head>
   
   <body> 
      <h2>h:messages example</h2> 
      <hr /> 
      
      <h:form> 
         <h:panelGrid id = "panel" columns = "2" border = "0" cellpadding = "10"  
         cellspacing = "1">   
            <h:outputLabel value = "Enter Username" /> 
            
            <h:inputText  id = "username"  size = "20" label = "UserName"  
               required = "true"> 
               <f:validateLength for = "username" minimum = "5" maximum = "20" />    
            </h:inputText>         
            <h:outputLabel value = "Enter Password" /> 
            
            <h:inputSecret id = "password" size = "20" label = "Password"  
               required = "true" redisplay = "true" > 
               <f:validateLength for = "password" minimum = "5" maximum = "10" />  
            </h:inputSecret>         
            <h:commandButton id = "submit" value = "Submit" action = "result"/> 
         </h:panelGrid> 
         <h:messages style = "color:red;margin:8px;" /> 
      </h:form> 
   
   </body> 
</html> 

Once you are ready with all the changes done, let us compile and run the application as we did in JSF - First Application chapter. If everything is fine with your application, this will produce following result:

JSF h:messages
jsf_basic_tags.htm

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