Adding row data dynamically in datatable in JSF

This code is useful when making order bill dynamically.


default.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">
    <h:head>
        <h:outputStylesheet library="css" name="table-style.css"  />
    </h:head>
    <h:body>
        <h:form>
            <h:dataTable value="#{order.orderList}" var="o"
                         styleClass="order-table"
                         headerClass="order-table-header"
                         rowClasses="order-table-odd-row,order-table-even-row">

                <h:column>

                    <f:facet name="header">Item</f:facet>
                    #{o.itemNo}

                </h:column>

                <h:column>

                    <f:facet name="header">Product Name</f:facet>
                    #{o.productName}

                </h:column>

                <h:column>

                    <f:facet name="header">Price</f:facet>
                    #{o.price}

                </h:column>

                <h:column>

                    <f:facet name="header">Quantity</f:facet>
                    #{o.qty}

                </h:column>

                <h:column>

                    <f:facet name="header">Line Total</f:facet>
                    #{o.lineTotal}

                </h:column>                               

                <h:column>

                    <f:facet name="header">Action</f:facet>

                    <h:commandLink value="Delete" action="#{order.deleteAction(o)}" />

                </h:column>

            </h:dataTable>
           
            <br/><br/>
            <h:outputLabel value="Grand Total: #{order.grandTotal}"></h:outputLabel>

            <h3>Enter Order</h3>
            <table>
                <tr>
                    <td>Item:</td>
                    <td><h:inputText size="10" value="#{order.itemNo}" /></td>
                </tr>
                <tr>
                    <td>Product Name :</td>
                    <td><h:inputText size="20" value="#{order.productName}" /></td>
                </tr>
                <tr>
                    <td>Price :</td>
                    <td><h:inputText size="10" value="#{order.price}" /></td>
                </tr>
                <tr>
                    <td>Quantity :</td>
                    <td><h:inputText size="5" value="#{order.qty}" /></td>
                </tr>

            </table>

            <h:commandButton value="Add" action="#{order.addAction}" />

        </h:form>
    </h:body>

</html>


OrderBean.java

package com.lftech.bean;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.ArrayList;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name = "order")
@SessionScoped
public class OrderBean implements Serializable {

    private static final long serialVersionUID = 1L;
    String itemNo;
    String productName;
    BigDecimal price;
    Integer qty;
    BigDecimal lineTotal = new BigDecimal("0.0");
    BigDecimal grandTotal = new BigDecimal("0.0");
    
    public String getItemNo() {
        return itemNo;
    }

    public void setItemNo(String itemNo) {
        this.itemNo = itemNo;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public Integer getQty() {
        return qty;
    }

    public void setQty(Integer qty) {
        this.qty = qty;
    }

    public BigDecimal getGrandTotal() {
        return grandTotal;
    }

    public void setGrandTotal(BigDecimal grandTotal) {
        this.grandTotal = grandTotal;
    }

    public BigDecimal getLineTotal() {
        return lineTotal;
    }

    public void setLineTotal(BigDecimal lineTotal) {
        this.lineTotal = lineTotal;
    }
   
    private static final ArrayList<Order> orderList = new ArrayList<Order>();   

    public ArrayList<Order> getOrderList() {
        return orderList;
    }

    public String addAction(){

        Order order = new Order(this.itemNo, this.productName,
                this.price, this.qty, this.lineTotal);

        orderList.add(order);

        lineTotal = order.returnLineTotal();
        grandTotal = grandTotal.add(lineTotal);
        clearField();
        return null;
    }

    public String deleteAction(Order order) {

        orderList.remove(order);
        grandTotal = grandTotal.subtract(order.lineTotal);
        return null;
    }

    private void clearField() {
        setItemNo("");
        setProductName("");
        setQty(new Integer("0"));
        setPrice(new BigDecimal("0.0"));
    }
}


Order.java



package com.lftech.bean;

import java.math.BigDecimal;

public class Order {

    String itemNo;
    String productName;
    BigDecimal price;
    Integer qty;
    BigDecimal lineTotal;

    public Order(String orderNo, String productName,
            BigDecimal price, Integer qty, BigDecimal lineTotal) {
        this.itemNo = orderNo;
        this.productName = productName;
        this.price = price;
        this.qty = qty;
        this.lineTotal = lineTotal;
    }

    public String getItemNo() {
        return itemNo;
    }

    public void setItemNo(String itemNo) {
        this.itemNo = itemNo;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public Integer getQty() {
        return qty;
    }

    public void setQty(Integer qty) {
        this.qty = qty;
    }

    public BigDecimal getLineTotal() {
        lineTotal = new BigDecimal(qty).multiply(price);

        return lineTotal;
    }

    public void setLineTotal(BigDecimal lineTotal) {
        this.lineTotal = lineTotal;

    }

    public BigDecimal returnLineTotal() {
        return new BigDecimal(qty).multiply(price);

    }
}

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