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AVISEK PANDA
dropdown list in jsf
3 Answer(s)      a year and 9 months ago
Posted in : Java Server Faces Questions


I want to add a list box to display the country name from the lists on all countries.When I select for e.g India then in the second list box it will display the states related to India only and the flow continues for state and areas related to state.Please provide the code with and without using database.


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June 11, 2013 at 12:35 PM


hi friend,

Here is a sample code for value changing of list box in JSF, hope this will be helpful for you.

FruitBean.java

package devmanuals;

import java.util.LinkedHashMap;
import java.util.Map;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.event.ValueChangeEvent;

@ManagedBean(name="fruit")
@RequestScoped
public class FruitBean {

    public int fruitPrice;
    private static Map<String,Integer> fruitName;
    static{
        fruitName = new LinkedHashMap<String,Integer>();
        fruitName.put("Select-Fruit", 0);
        fruitName.put("Apple", 110);
        fruitName.put("Mango", 80);
        fruitName.put("Guava", 40);
        fruitName.put("Grapes", 90);
        fruitName.put("PineApple", 50);
    }

    public Map<String,Integer> getFruitName() {
        return fruitName;
    }
    public int getFruitPrice() {
        return fruitPrice;
    }

    public void setFruitPrice(int fruitPrice) {
        this.fruitPrice = fruitPrice;
    }
}

Continue...



June 11, 2013 at 12:36 PM


FruitPriceListener.java

package devmanuals;

import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ValueChangeEvent;
import javax.faces.event.ValueChangeListener;

public class FruitPriceListener implements ValueChangeListener {

    @Override
    public void processValueChange(ValueChangeEvent e)
            throws AbortProcessingException {
        FruitBean fruit = (FruitBean) FacesContext.getCurrentInstance().
            getExternalContext().getRequestMap().get("fruit");

        fruit.setFruitPrice((Integer) e.getNewValue());
        System.out.println("Value of component has been changed");
        System.out.print("Component which value is being changed :");
        System.out.println(e.getComponent());
        System.out.println("JSF PhaseId : "+e.getPhaseId());        
    }
}

Continue...



June 11, 2013 at 12:37 PM


fruitPrice.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" >
<head>
<title>JSF 2 f valueChangeListener example</title>
</head>
<body>
<f:view>
  <h:form>
   <h:panelGrid columns="2">

    <h:outputText value="Price of Fruit :"/> 
    <h:inputText value="#{fruit.fruitPrice}" />

    <h:outputText value="Select Fruit :"/> 
    <h:selectOneListbox value="#{fruit.fruitPrice}" onchange="submit()">
    <f:valueChangeListener type="devmanuals.FruitPriceListener" />
    <f:selectItems value="#{fruit.fruitName}" />
    </h:selectOneListbox>
    </h:panelGrid>
  </h:form>
</f:view>
</body>
</html>

Thanks.



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