JSF Validation, validation, JSF, JSF Tutorial, JSF Article, simple, example

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Please be informed that NONE of the design/code from this
page is claiming to be some sort of best practices and we DO NOT expect
any of our visitor/reader of this page to assume this as some sort of
best practice for any context and should not be using this 
as it is without appropriate evaluation to their, so to say, 
specific programming context.

This page intends only to provide bit and piece of known ways  for
doing some sort of example and may not be fit for any other purpose.

JSF based form validation for input text
Extending an already hosted example on JSF, at JSF Example
I am going to discuss more on form text field validation
using JSF (version 1.0) as technology.

Software environment I have used for this example, so far as follows:
1. JDK 5.0.x
2. Tomcat 5.5.x
3. Eclipse 3.2
4. Apache Tomcat 6.0.18
5. List of JAR files used for this example as as follows:
   5.1. commons-beanutils.jar
   5.2. commons-collections.jar
   5.3. commons-digester.jar
   5.4. commons-logging.jar
   5.5. jsf-api.jar
   5.6. jsf-impl.jar
   5.7. jstl.jar
   5.8. standard.jar



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The JSF form has two input text and secret fields, and we are
going to discuss more on how to do input text field validation
and showing error messages on screen.

index.jsp
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="sampleHtml" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="sampleCore" %>
<html>
<body>
<h4>Enrollment form:</h4>
<sampleCore:view>
<sampleHtml:messages layout="table"/>
  <sampleHtml:form>
    <table>
     <tr><td>Name :</td><td><sampleHtml:inputText  value="#{SampleMGMTBean.txtName}" /></td></tr>
     <tr><td>Pass :</td><td><sampleHtml:inputSecret  value="#{SampleMGMTBean.txtPass}"/></td></tr>
     <tr><td><sampleHtml:commandButton value="Submit" action="#{SampleMGMTBean.submitButton}"/></td>
     <td><sampleHtml:commandButton value="Cancel" action="#{SampleMGMTBean.cancelButton}"/></td></tr>
    </table>
  </sampleHtml:form>
</sampleCore:view>
</body>
</html>


ButtonEventCapture.java
package sample;
/**
* This code is provided on "AS IS" basis
* @Author: Amit
* @Contact: http://www.interview-questions-tips-forum.net
*/
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;

public class ButtonEventCapture
{
    String txtName;
    String txtPass;

    public void setTxtName(String txtName) {
      this.txtName = txtName;
    }
    public String getTxtName() {
      return txtName;
    }
    public void setTxtPass(String txtPass) {
      this.txtPass = txtPass;
    }
    public String getTxtPass() {
      return txtPass;
    }
    public String submitButton() {
      System.out.println("Submit button is clicked...");
      System.out.println("Name: "+txtName);
      System.out.println("Pass: "+txtPass);
      if(txtName.trim().equalsIgnoreCase("")) {
        FacesContext.getCurrentInstance().
                     addMessage("name_blank", 
                     new FacesMessage(FacesMessage.SEVERITY_ERROR,
							               "Please enter name",""));
      }
      if(txtPass.trim().equalsIgnoreCase("")) {
        FacesContext.getCurrentInstance().
        addMessage("pass_blank", 
          new FacesMessage(FacesMessage.SEVERITY_ERROR,
                           "Please enter password",""));
      }
      if(txtName.length() >8) {
        FacesContext.getCurrentInstance()
                    .addMessage("name_too_large",
                    new FacesMessage(FacesMessage.SEVERITY_ERROR,
                    "Name should be lesser than 8 characters",""));
      }
      Iterator itr = FacesContext.getCurrentInstance().getMessages();
      if(itr.hasNext()) {
        FacesMessage msg = (FacesMessage) itr.next();
        List list = msg.VALUES;
        if(list.size() > 0) {
          return null;
        }
      }
       return "preview";
    }
    public String cancelButton() {
      System.out.println("Cancel button is clicked...");
      return null;
    }
}


Please note the text marked as BOLD above, the way to
add message to FacesContext to be able to show on screen.
using the Tag in index.jsp page.

All other files such as web.xml, faces-config.xml files
can be seen in the earlier JSF Example

This example can be treated as a very basic steps towards knowing
form validation using JSF, and is debatable.



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Some of the screens captured with many test cases such as
1. submit button is pressed by leaving name and pass text fields
   as blank.
2. submit button is clicked by entering name as a text with 
   more than 8 characters length and leaving pass as blank.
3. submit button is clicked by entering appropriate values
   for the name and pass text fields and then seeing preview
   screen as shown below:
   

In order to run this example using browser, the URL is

http://localhost:8080/JSF-Sample/index.jsf
Here the web address is localhost, web application name is
JSF-Sample, If you try to use index.jsp or / at the end of this URL,
you may encounter error on page, as mentioned in the web.xml
file, the servlet URL mapping refers to *.jsf

Author of this article/writeup has expressed his/her willingness

to help or guide users with any technical difficulties he/she faces while working with the example code environment setting up, running and resolving any such exception raised during compile or at runtime. You may ask for any technical doubt or seek technical help related to this article by using following form to reach for technical help from the Author for FREE. This article's Author shall be reading your request and responding within reasonable time (no resolution timeframe defined as such).

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