struts2 combobox tag example

<s:combobox>:

The <s:combobox> tag is used to create a HTML drop down list box which is grouped with a single line text box. User can type the value directly in the text box or select the value from the drop down list. If value is selected from the drop down list then selected value will be populated automatically into the text box.

Syntax:

<s: combobox label="fieldLabel" headerKey="firstItemValue" headerValue="firstItem" list="selectList" name="fieldName" />

Example:

index.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  	<title>Struts 2 s:combobox UI tags example</title>
	<META HTTP-EQUIV="Refresh" CONTENT="0;URL=initializeList.action">
  </head>  
  <body>
  </body>
</html>

test.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
	<head>
		<title>Struts 2 s:combobox UI tags example</title>
	</head>
	<body>
		<h3>This is a s:combobox UI tags example.</h3>
 
		<s:form action="test">
			<s:combobox label="Select Subject" 
				headerKey="-1" headerValue="Select Subject"
				list="subjectList" name="selectedSubject"/>
			<s:submit value="Submit"/>
		</s:form>
 
	</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 
 
 	<filter>
	  <filter-name>struts2</filter-name>
	  <filter-class>
        	org.apache.struts2.dispatcher.ng.
        	filter.StrutsPrepareAndExecuteFilter
          </filter-class>
	</filter>
 
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
 
	<welcome-file-list>
	  <welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
 
</web-app>

struts.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 
      <package name="default" extends="struts-default">
	<action name="initializeList" 
            class="com.w3spoint.action.Test" method="initializeList">
		<result name="none">/test.jsp</result>
	</action>
 
	<action name="test" class="com.w3spoint.action.Test">
		<result name="success">/welcome.jsp</result>
	</action>
      </package>
 
</struts>

Test.java

import java.util.ArrayList;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
 
/**
 * This class is used as an action class.
 * @author w3spoint
 */
public class Test extends ActionSupport{
	//data members
	private List<String> subjectList;
	private String selectedSubject;
 
	//business logic
	public String execute(){
		return SUCCESS;	
	}
 
	//getter setters
	public List<String> getSubjectList() {
		return subjectList;
	}
 
	public void setSubjectList(List<String> subjectList) {
		this.subjectList = subjectList;
	}
 
	public String getSelectedSubject() {
		return selectedSubject;
	}
 
	public void setSelectedSubject(String selectedSubject) {
		this.selectedSubject = selectedSubject;
	}
 
	public String initializeList(){
		subjectList = new ArrayList<String>();
		subjectList.add("Java");
		subjectList.add("DBMS");
		subjectList.add("Networking");
		return NONE;
	}	
 
}

welcome.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
	<head>
		<title>Struts 2 s:combobox UI tags example</title>
	</head>
	<body>
		<h3>This is a s:combobox UI tags example.</h3>
 
		Selected subject: <s:property value="selectedSubject"/>
 
	</body>
</html>