jsp- database dependent dropdown list

i want 2 dropdown list 1- CLASS 2-SECTION both are should come from database. and if i select a class suppose class a the corresponding section dropdown list should retrieve the section respective to that class from database. please help by providing the code in jsp as soon as possible.its urgetnt.

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May 31, 2013 at 4:49 PM

thank you sir, but its nt working in my pc and that to i am nt aware of the ajax so please send me the same project in jsp

October 27, 2011 at 11:28 AM

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   
      }   
      }
      </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>  
      </body> 
      </html>

2)state.jsp:

 <%@page import="java.sql.*"%>
<%
String country=request.getParameter("count");  
 String buffer="<select name='state' ><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);
 }

 %>

For the above code, we have created two database tables:

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

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

November 1, 2011 at 11:45 AM

Hai friends I have a doubt in above code that How can we get those selected values into our SERVLET.

I mean i could display the values dynamaically but while submitting the form,the selected values getting NULL.

I replaced the code in above

still i could not...please provide solution

November 1, 2011 at 11:54 AM

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<%@ page language="java" %>
<%@ page import="java.sql.*" %>
<html>

<script>

function change(){
var cid=document.getElementById("books").selectedIndex;
var val = document.getElementById("books").options[cid].text;
window.location.replace("http://localhost:8080/faculty/book1.jsp?id="+cid+"&&value="+val);
}
function extract(){
var ide=document.getElementById("info").selectedIndex;
var bookname = document.getElementById("info").options[ide].text;

window.location.replace("http://localhost:8080/faculty/book1.jsp?book="+bookname);
}
function extractsub(){
var sde=document.getElementById("subject").selectedIndex;
var subject = document.getElementById("subject").options[sde].text;

window.location.replace("http://localhost:8080/faculty/book1.jsp?subject="+subject);
}
function enableDisable() {
  if(document.book1.holiday.checked){
     document.book1.txt.disabled = false;
} else {
document.book1.txt.disabled = true;
}
  }
</script>
    <input type="text" name="txt">
    <form name="book1" action="try.jsp" method="post" >
<%!
Connection conn = null;
ResultSet rs =null;
Statement st=null;
String query="";

%>
<%
String value=request.getParameter("value");
Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/newdatabase","root","root"); 
st = con.createStatement();
rs = st.executeQuery("select * from book");
%>
<select id="books" name="books" onchange="change();">
<option value="0">--Please Select--</option>
<% 
while(rs.next())
{
%>
<option value="<%=rs.getString("books")%>"><%=rs.getString("books")%></option>
<% 
if(rs.getString("books").equals(value))
{

%>
<option value="<%=value%>" selected disabled><%=value%></option>
<%
}
}
%>
</select>
<select id="info" name ="info">
<option value="0">--Please Select--</option>
<%
String id=request.getParameter("id");
rs=st.executeQuery("select * from bookinformation where bookid='"+id+"'");
while(rs.next())
{
%>
<option value="<%=rs.getString("id")%>" ><%=rs.getString("booknames")%></option>
<%
}
%>
</select>
HOLIDAY<input type ="checkbox" name="holiday" value="HOLIDAY" onclick="radio.disable=!this.checked">
<br><h3>SUBJECTS</h3>
<table>
  <%
String sid=request.getParameter("id");

    rs=st.executeQuery("select * from subject where id='"+sid+"'");


 while(rs.next())
           {

%>

<tr><td><%=rs.getString("subject")%></td><td><input type="radio" value="<%=rs.getString("subject")%>" name="subject" onchange="extractsub();"></td>

    <%
       }
    %>


</tr>


</table>
        <select id="faculty_name" name="faculty_name">
<option value="0">--Please Select--</option>
<%
String faculty_name=request.getParameter("faculty_name");
rs=st.executeQuery("select * from faculty_name ");
while(rs.next())
{
        %>
      <option value="<%=rs.getString("faculty_name")%>"><%=rs.getString("faculty_name")%></option>
           <%
                     }
        %>
    </select>
    <input type="submit" value="SUBMIT">
    </form>

</body>
</html>

i have included this coding my project. this coding will create 2 dropdown and dependent on each other. and u'll get a list of subjects in radio button according to the selection made in first drop down list.

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