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sandy
jsp drop down-- select Option
2 Answer(s)      3 years and 11 months ago
Posted in : JSP-Interview Questions


how to get drop down populated dynamically


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October 21, 2010 at 4:26 PM


Hi Friend,

Create table country(country_id,country) in database and try the following code:

<%@page import="java.sql.*"%>
<html>
<form name="form" method="post" >
<b>Select a country:</b>&nbsp;</td>
<select name="sel"><option value=""><---Select---></option>
<%
Class.forName("com.mysql.jdbc.Driver").newInstance();
String connectionURL = "jdbc:mysql://localhost:3306/test";
Connection connection= DriverManager.getConnection(connectionURL, "root", "root");
PreparedStatement psmnt = connection.prepareStatement("select * from country ");
ResultSet results = psmnt.executeQuery();
while(results.next()){
String name = results.getString(2);
String id = results.getString(1);
%><option value="<%= name %>"><%=name%></option>
<%} results.close(); psmnt.close(); %>
</select><br>
</form>

Thanks



October 21, 2010 at 4:49 PM


Hi Friend,

If you want the code in ajax then try the following code:

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= "city.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)city.jsp:

 <%@page language="java" import ="java.sql.*" %>  
 <%  
 String country=request.getParameter("count");  
 String buffer="<select name='state'><option value='-1'>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 city where countryid='"+country+"' ");  
   while(rs.next()){
   buffer=buffer+"<option value='"+rs.getString(2)+"'>"+rs.getString(3)+"</option>";  
   }  
 buffer=buffer+"</select>";  
 response.getWriter().println(buffer);  
 %>

We have used following database tables:

1)country

CREATE TABLE country (
countryid bigint(30) NOT NULL auto_increment,
countryname varchar(40) default NULL,
PRIMARY KEY (countryid)
)

2)city

CREATE TABLE city (
id bigint(40) NOT NULL auto_increment,
countryid int(100) default NULL,
city varchar(40) default NULL,
PRIMARY KEY (id)
)

The above code populate the second dropdown on selecting the value from the first dropdown.

Thanks



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