Struts 2 - AJAX Drop down Example

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Struts 2 is a powerful web application development framework. Its built on top of WebWork framework and rebranded as Struts 2. Due to excessive popularity of Struts 1 its difficult to search for much relevant documentation on web about struts2. Slowly the search engines are improving on that.

In this example when you select from one drop down the other will populate accordingly. You can use it as is or play around with it based on your need

Index.jsp

    <%@ taglib prefix="s" uri="/struts-tags" %>
    

Listing.jsp

<%@ taglib prefix="s"  uri="/struts-tags"%>
    
     
    
     
     
    
     
    
    
    
     
     
     
    
     onchange="javascript:show_details();return false;"  >
    
     id="details" href="%{d_url}"  theme="ajax"
    listenTopics="show_detail"  formId="frm_demo">
     
     
    
     

Detail.jsp

    <%@ taglib prefix="s" uri="/struts-tags"%>
 
    
    
    
 

DetailAction.java

    package ajaxdemo.action;
 
    import java.util.ArrayList;
    import java.util.List;
 
    import com.opensymphony.xwork2.ActionSupport;
 
    public class DetailAction extends ActionSupport {
     private String lst;
     private List lstList = null;
     private List lstList2 = null;

     public String execute() throws Exception {

     if (getLst() != null && !getLst().equals("")) {
     populateDetail(getLst());
     return SUCCESS;
     } else {
     return SUCCESS;
     }
     }

     private void populateDetail(String id) {
      lstList = new ArrayList();
      if (id.equalsIgnoreCase("Fruits")) {
      lstList.add("Apple");
      lstList.add("PineApple");
      lstList.add("Mango");
      lstList.add("Banana");
      lstList.add("Grapes");
      } else if (id.equalsIgnoreCase("Places")) {
      lstList.add("New York");
      lstList.add("Sydney");
      lstList.add("California");
      lstList.add("Switzerland");
      lstList.add("Paris");
      } else {
      lstList.add("Other 1");
      lstList.add("Other 2");
      lstList.add("Other 3");
      lstList.add("Other 4");
      lstList.add("Other 5");
      }
     }

     public List getLstList() {
      return lstList;
     }

     public void setLstList(List lstList) {
      this.lstList = lstList;
     }

     public String getLst() {
      return lst;
     }

     public void setLst(String lst) {
     this.lst= lst;
     }
    }

DetailListing.java

    package ajaxdemo.action;
 
    import com.opensymphony.xwork2.ActionSupport;
    import java.util.ArrayList;
    import java.util.List;
 
    public class ListingAction extends ActionSupport {
    private List lstList1 = null;
 
    public String execute() throws Exception {
    populateDetail();
    return SUCCESS;
    }
 
    private void populateDetail() {
    lstList1 = new ArrayList();
    lstList1.add("Fruits");
    lstList1.add("Places");
    lstList1.add("Others");
 
    }
 
    public List getLstList1() {
    return lstList1;
    }
 
    public void setLstList1(List lstList1) {
    this.lstList1 = lstList1;
    }
    }

Struts.xml

        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
    
    
    
    /listing.jsp
    
    
    /detail.jsp
    
    
     

web.xml

    
    
    
    struts2
    org.apache.struts2.dispatcher.FilterDispatcher
    
    
    struts2
    /*
    
    
    index.jsp