Dynamic select box

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Dynamic select box

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December 18, 2009 at 12:25 PM

Hi Friend,

We have used the tables country(country_id(Number),countryname(Text)) and city(cityid(Number),country_id(Text),cityname(Text))

Try the following code:

<%@ page language="java" %>
<%@ page import="java.sql.*" %>

<%!
Connection conn = null;
ResultSet rs =null;
Statement st=null;
String query="";
int cid;

%>

<%
if(request.getParameter("cid")!=null){
cid=Integer.parseInt(request.getParameter("cid"));
}else {
cid=0;
}
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection("jdbc:odbc:access","","");
st = conn.createStatement();
rs = st.executeQuery("select * from country");
%>
<html>
<head>
<script type="text/javascript">

function selectCity(){
var cid=document.getElementById("country").selectedIndex;
window.location.replace("http://localhost:8080/examples/jsp/countrycombo.jsp?cid="+cid);
}
</script>
</head>
<body>
<select id="country" onchange="selectCity(this)">
<option value="0">--Please Select--</option>
<% while(rs.next()){ %>
<option value='<%=rs.getInt("country_id")%>'><%=rs.getString("countryname")%></option>
<%}%>
</select>
<%
rs = st.executeQuery("select * from city where country_id='"+cid+"'");
%>
<select>
<% while(rs.next()){ %>
<option value='<%=rs.getInt("country_id")%>'><%=rs.getString("cityname")%></option>
<%}%>
</select>
</body>
</html>

Thanks

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