How to display datatable row number in JSF-JavaTyro

Thursday, 26 September 2013

How to display datatable row number in JSF

In database, datatable, jsf2.0 // siddhu vydyabhushana // 4 comments

JSF dataTable does not contains any method to display the currently selected row numbers. However, you can hack it with javax.faces.model.DataModel class, which has a getRowIndex() method to return the currently selected row number.

JSF + DataModel

Here’s a JSF 2.0 example to show you how to use DataModel to return the currently selected row number.

1. Managed Bean

A managed bean named “person”, and show the use of DataModel to hold a list of the person object.

package com.mkyong;
 
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.model.ArrayDataModel;
import javax.faces.model.DataModel;
 
@ManagedBean(name="person")
@SessionScoped
public class PersonBean implements Serializable{
 
	private static final long serialVersionUID = 1L;
 
	private static final Person[] personList = new Person[]{
 
		new Person("Person", "A", 10),
		new Person("Person", "B", 20),
		new Person("Person", "C", 30),
		new Person("Person", "D", 40),
		new Person("Person", "E", 50)
 
	};
 
	/* To get the row numbers, use dataModel instead
	public Person[] getPersonList() {
 
		return personList;
 
	}
	*/
 
	private DataModel<Person> person = new ArrayDataModel<Person>(personList);
 
	public DataModel<Person> getPersonList() {
 
		return person;
 
	}
 
	public static class Person{
 
		String firstName;
		String lastName;
		int age;
 
		public Person(String firstName, String lastName, int age) {
			super();
			this.firstName = firstName;
			this.lastName = lastName;
			this.age = age;
		}
 
		//getter and setter methods 
	}
}

2. JSF Page

JSP page to show the use of DataModel “rowIndex” to return 0-indexed of the currently selected row number.

<?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>
    	<h:outputStylesheet library="css" name="table-style.css"  />
    </h:head>
    <h:body>
 
    	<h1>Display dataTable row numbers in JSF</h1>
 
    	   <h:dataTable value="#{person.personList}" var="p"
    		styleClass="person-table"
    		headerClass="person-table-header"
    		rowClasses="person-table-odd-row,person-table-even-row"
    	   >
 
		<h:column>
 
    			<!-- display currently selected row number -->
    			<f:facet name="header">No</f:facet>
    			#{person.personList.rowIndex + 1}
 
    		</h:column>
 
    		<h:column>
 
    			<f:facet name="header">First Name</f:facet>
    			#{p.firstName}
 
    		</h:column>
 
    		<h:column>
 
    			<f:facet name="header">Last Name</f:facet>
    			#{p.lastName}
 
    		</h:column>
 
    		<h:column>
 
    			<f:facet name="header">Age</f:facet>
    			#{p.age}
 
    		</h:column>
 
    	   </h:dataTable>
 
    </h:body>
</html>

3. Demo

Download Source Code

Download It – JSF-2-DataTable-RowNumbers-Example.zip (10KB)

Thursday, 26 September 2013