Hi, I'm new to JSP I want to create 3 dropdown list each depend on the other and get the options from the database using JSP

as i said i want to create 3 drop dropdown list each depend on the other and get the options from the database using JSP. like country,state,city..please guide me....

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November 28, 2012 at 3:10 PM

Here is a jsp code of dependent dropdown boxes. When the user selects country name, its states will get displayed in another dropdown and when the user selects particular state, the cities of that state will get displayed in another dropdown.

1)country.jsp:

<%@page import="java.sql.*"%>
 <html>
      <head>  
      <script language="javascript" type="text/javascript">  
      var xmlHttp  
      var xmlHttp
      function showState(str){
      if (typeof XMLHttpRequest != "undefined"){
      xmlHttp= new XMLHttpRequest();
      }
      else if (window.ActiveXObject){
      xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
      }
      if (xmlHttp==null){
      alert("Browser does not support XMLHTTP Request")
      return;
      } 
      var url="state.jsp";
      url +="?count=" +str;
      xmlHttp.onreadystatechange = stateChange;
      xmlHttp.open("GET", url, true);
      xmlHttp.send(null);
      }

      function stateChange(){   
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){   
      document.getElementById("state").innerHTML=xmlHttp.responseText   
      }   
      }

      function showCity(str){
      if (typeof XMLHttpRequest != "undefined"){
        xmlHttp= new XMLHttpRequest();
        }
      else if (window.ActiveXObject){
        xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
        }
      if (xmlHttp==null){
      alert("Browser does not support XMLHTTP Request")
      return;
      } 
      var url="city.jsp";
      url +="?count=" +str;
      xmlHttp.onreadystatechange = stateChange1;
      xmlHttp.open("GET", url, true);
      xmlHttp.send(null);
      }
      function stateChange1(){   
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){   
      document.getElementById("city").innerHTML=xmlHttp.responseText   
      }   
      }
      </script>  
      </head>  
      <body>  
      <select name='country' onchange="showState(this.value)">  
       <option value="none">Select</option>  
    <%
 Class.forName("com.mysql.jdbc.Driver").newInstance();  
 Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");  
 Statement stmt = con.createStatement();  
 ResultSet rs = stmt.executeQuery("Select * from country");
 while(rs.next()){
     %>
      <option value="<%=rs.getString(1)%>"><%=rs.getString(2)%></option>  
      <%
 }
     %>
      </select>  
      <br>  
      <div id='state'>  
      <select name='state' >  
      <option value='-1'></option>  
      </select>  
      </div>  

      <div id='city'>  
      <select name='city' >  
      <option value='-1'></option>  
      </select>  
      </div>
      </body> 
      </html>

November 28, 2012 at 3:11 PM

continue..

2)state.jsp:

<%@page import="java.sql.*"%>
<%
String country=request.getParameter("count");  
 String buffer="<select name='state' onchange='showCity(this.value);'><option value='-1'>Select</option>";  
 try{
 Class.forName("com.mysql.jdbc.Driver").newInstance();  
 Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");  
 Statement stmt = con.createStatement();  
 ResultSet rs = stmt.executeQuery("Select * from state where countryid='"+country+"' ");  
   while(rs.next()){
   buffer=buffer+"<option value='"+rs.getString(1)+"'>"+rs.getString(3)+"</option>";  
   }  
 buffer=buffer+"</select>";  
 response.getWriter().println(buffer); 
 }
 catch(Exception e){
     System.out.println(e);
 }

 %>

3)city.jsp:

<%@page import="java.sql.*"%>
<%
String state=request.getParameter("count");  
 String buffer="<select name='city'><option value='-1'>Select</option>";  
 try{
 Class.forName("com.mysql.jdbc.Driver").newInstance();  
 Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");  
 Statement stmt = con.createStatement();  
 ResultSet rs = stmt.executeQuery("Select * from city where stateid='"+state+"' ");  
   while(rs.next()){
   buffer=buffer+"<option value='"+rs.getString(2)+"'>"+rs.getString(3)+"</option>";  
   }  
 buffer=buffer+"</select>";  
 response.getWriter().println(buffer); 
 }
 catch(Exception e){
     System.out.println(e);
 }
 %>

We have created 3 dependent dropdown. You can create the fourth one similarly.

For the above code, we have used 3 database tables:

1)country

CREATE TABLE `country` (                                 
           `countryid` bigint(255) NOT NULL auto_increment,       
           `countryname` varchar(255) default NULL,               
           PRIMARY KEY  (`countryid`)                             
     )

2)state

CREATE TABLE `state` (                                   
          `stateid` bigint(255) NOT NULL auto_increment,         
          `countryid` int(255) default NULL,                     
          `state` varchar(255) default NULL,                     
          PRIMARY KEY  (`stateid`)                               
        )

3)city

CREATE TABLE `city` (                                    
          `cityid` bigint(255) NOT NULL auto_increment,          
          `stateid` int(255) default NULL,                       
          `city` varchar(255) default NULL,                      
          PRIMARY KEY  (`cityid`)                                
        )