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populate one drop down on change of other using ajax and servlet with jsp page

 
Greenhorn
Posts: 11
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i am new in java struts i am developing web application in struts 1.3 i have two dropdowns one is for location and another is for Floor,i have a requirement that on change on one dropdown values of other dropdown fills from database for i googled a lot and i got code but when i change on my first dropdown second dropdown does not populate though i saw in debugging mode in Netbeans that that values return from database my sample code is this

my JSP page

<script>
function createRequestObject()
{

var req;

if(window.XMLHttpRequest)
{
//For Firefox, Safari, Opera
req = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
//For IE 5+
req = new ActiveXObject("Microsoft.XMLHTTP");
}
else
{
//Error for an old browser
alert('Your browser is not IE 5 or higher, or Firefox or Safari or Opera');
}

return req;
}

//Make the XMLHttpRequest Object
var http = createRequestObject();

function sendRequest(method, url)
{

if(method == 'get' || method == 'GET')
{

http.open(method,url);
http.onreadystatechange = handleResponse;
http.send(null);
}
}

function handleResponse()
{

if(http.readyState == 4 && http.status == 200)
{

var response = http.responseText;
if(response)
{

document.getElementById("dwnfloor").innerHTML = response;
}
}
}

function getFloorDropdown(SelectedValue)
{
alert(SelectedValue);
sendRequest('GET','http://localhost:8084/AssetManagement/DropDown?locid=' +SelectedValue );
}

</script>

<tr>
<td >
<span style="color:#FF0000">*</span>Location</td>
<td> <html:select name="RoomForm" property="name"
onchange="getFloorDropdown(this.value)">
<html:option value="0">Select Location</html:option>
<html:optionsCollection name="RoomForm"
property="list" value="id" label="name" />
</html:select>
<td>

</tr>
<tr>
<td >
<span style="color:#FF0000">*</span>Floor
</td>
<td id="dwnfloor">

<select name="dwnfloor">
<option value="0">Select Floor</option>
</select>


</td>

</tr>

my Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response);

String country=request.getParameter("locid");
String buffer="<select name=\"dwnfloor\"><option value=\"0\">Select</option>";

Connection connection = null;
PreparedStatement p_statement = null;
Statement statement = null;
ResultSet result = null;

try{
DAOOperation dao= new DAOOperation();
/* ResultSet rs=dao.PopulateDropDown(country);*/
String sqlst = "select id,name from floor_mst where id=?";


try {
connection = DBConnection.getConnection();
p_statement = connection.prepareStatement(sqlst);
p_statement.setString(1, country);

result = p_statement.executeQuery();
while(result.next())
{
buffer=buffer+"<option value=\""+result.getString("ID")+"\">"+result.getString("name")+"</option>";
}
buffer=buffer+"</select>";
response.getWriter().println(buffer);
System.out.println(buffer);

} catch (Exception e) {
e.printStackTrace();
}// end of catch

finally {
try {
connection.close();
} catch (Exception e) {
}
}// end finally



}
catch(Exception e){
System.out.println(e);
}

}
and servlet mapping in web.xml

web.xml

<servlet-mapping>
<servlet-name>DropDown</servlet-name>
<url-pattern>/DropDown</url-pattern>
</servlet-mapping>

where i am doing wrong i am not understanding please any body help
 
Ranch Hand
Posts: 35
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I am also facing the same problem can any one help!
 
Don't get me started about those stupid light bulbs.
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