Java,Android,j2ee and jsp tutorials blog: How to display datatable row number in JSF

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>