PrimeFaces Ajax Dropdown

PrimeFaces provides an easy way to create dynamic dropdown on the basis of filter. A new dropdown is formed by Ajax call. The <p:ajax> tag call Java method after each event is occurred.

In the following example, we are creating two dropdown. This example includes the following files.

JSF File

// ajax-dropdown.xhtml

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml"
xmlns:h="https://xmlns.jcp.org/jsf/html"
xmlns:p="https://primefaces.org/ui"
xmlns:f="https://xmlns.jcp.org/jsf/core">
<h:head>
<title>Ajax Dropdown</title>
</h:head>
<h:body>
<h:form>
<p:growl id="msgs" showDetail="true" />
<p:panel header="Provide Your Address" style="margin-bottom:10px;">
<h:panelGrid columns="2" cellpadding="5">
<p:outputLabel for="country" value="Country: " />
<p:selectOneMenu id="country" value="#{dropdown.country}" style="width:150px">
<p:ajax listener="#{dropdown.onCountryChange}" update="city" />
<f:selectItem itemLabel="Select Country" itemValue="" noSelectionOption="true" />
<f:selectItems value="#{dropdown.countries}" />
</p:selectOneMenu>
<p:outputLabel for="city" value="City: " />
<p:selectOneMenu id="city" value="#{dropdown.city}" style="width:150px">
<f:selectItem itemLabel="Select City" itemValue="" noSelectionOption="true" />
<f:selectItems value="#{dropdown.cities}" />
</p:selectOneMenu>
</h:panelGrid>
<p:separator />
<p:commandButton value="Submit" update="msgs" actionListener="#{dropdown.displayLocation}" icon="ui-icon-check" />
</p:panel>
</h:form>
</h:body>
</html>

ManagedBean

// Dropdown.java

package com.javatpoint;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
@ManagedBean
@ViewScoped
public class Dropdown implements Serializable {
private final Map<String,Map<String,String>> data = new HashMap<>();
private String country; 
private String city;  
private Map<String,String> countries;
private Map<String,String> cities;
@PostConstruct
public void init() {
countries  = new HashMap<>();
countries.put("USA", "USA");
countries.put("India", "India");
countries.put("Russia", "Russia");
Map<String,String> map = new HashMap<>();
map.put("New York", "New York");
map.put("San Francisco", "San Francisco");
map.put("Denver", "Denver");
data.put("USA", map);
map = new HashMap<>();
map.put("New Delhi", "New Delhi");
map.put("Bombay", "Bombay");
map.put("Calcutta", "Calcutta");
data.put("India", map);
map = new HashMap<>();
map.put("Moscow", "Moscow");
map.put("Saint Petersburg", "Saint Petersburg");
map.put("Samara", "Samara");
data.put("Russia", map);
}
public Map<String, Map<String, String>> getData() {
return data;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public Map<String, String> getCountries() {
return countries;
}
public Map<String, String> getCities() {
return cities;
}
public void onCountryChange() {
if(country !=null && !country.equals(""))
cities = data.get(country);
else
cities = new HashMap<>();
}
public void displayLocation() {
FacesMessage msg;
if(city != null && country != null)
msg = new FacesMessage("Selected", city + " of " + country);
else
msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Invalid", "City is not selected."); 
FacesContext.getCurrentInstance().addMessage(null, msg);  
}
}
package com.javatpoint;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
@ManagedBean
@ViewScoped
public class Dropdown implements Serializable {
private final Map<String,Map<String,String>> data = new HashMap<>();
private String country; 
private String city;  
private Map<String,String> countries;
private Map<String,String> cities;
@PostConstruct
public void init() {
countries  = new HashMap<>();
countries.put("USA", "USA");
countries.put("India", "India");
countries.put("Russia", "Russia");
Map<String,String> map = new HashMap<>();
map.put("New York", "New York");
map.put("San Francisco", "San Francisco");
map.put("Denver", "Denver");
data.put("USA", map);
map = new HashMap<>();
map.put("New Delhi", "New Delhi");
map.put("Bombay", "Bombay");
map.put("Calcutta", "Calcutta");
data.put("India", map);
map = new HashMap<>();
map.put("Moscow", "Moscow");
map.put("Saint Petersburg", "Saint Petersburg");
map.put("Samara", "Samara");
data.put("Russia", map);
}
public Map<String, Map<String, String>> getData() {
return data;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public Map<String, String> getCountries() {
return countries;
}
public Map<String, String> getCities() {
return cities;
}
public void onCountryChange() {
if(country !=null && !country.equals(""))
cities = data.get(country);
else
cities = new HashMap<>();
}
public void displayLocation() {
FacesMessage msg;
if(city != null && country != null)
msg = new FacesMessage("Selected", city + " of " + country);
else
msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Invalid", "City is not selected."); 
FacesContext.getCurrentInstance().addMessage(null, msg);  
}
}

After executing, it produces the following output.

Output:

The second dropdown contains the city names for each country. Each time country is selected, city dynamically updates.

Next TopicPrimeFaces Ajax Poll

← prev next →

For Videos Join Our Youtube Channel: Join Now

Feedback

Send your Feedback to [email protected]

Help Others, Please Share

Learn Latest Tutorials

Splunk

SPSS

Swagger

Transact-SQL

Tumblr

ReactJS

Regex

Reinforcement Learning

R Programming

RxJS

React Native

Python Design Patterns

Python Pillow

Python Turtle

Keras

Preparation

Aptitude

Reasoning

Verbal Ability

Interview Questions

Company Questions

Trending Technologies

Artificial Intelligence

AWS

Selenium

Cloud Computing

Hadoop

ReactJS

Data Science

Angular 7

Blockchain

Git

Machine Learning

DevOps

B.Tech / MCA

DBMS

Data Structures

DAA

Operating System

Computer Network

Compiler Design

Computer Organization

Discrete Mathematics

Ethical Hacking

Computer Graphics

Software Engineering

Web Technology

Cyber Security

Automata

C Programming

C++

Java

.Net

Python

Programs

Control System

Data Mining

Data Warehouse

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on [email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected]
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}