ISSUE WITH AJAX CASCADING DROP DOWN CONTROL

[john_mcmahon]

I'm having issues populating a second drop down menu that's dependent
upon a selection in the first menu. When I select an option from the
first menu, the second menu remains disabled, i.e. unable to select an
option. I'm confident that most of my code is correct because of
testing that I completed with it. For instance, when I remove the
ParentControlID attribute from the second control and un-comment out:
// string sPlantTypeID = "2";
// int iPlantTypeID = LT.Utils.CInt(s PlantTypeID);

and comment out:
int iPlantTypeID;
if (!kv.ContainsKe y("PlantTypeDes cription") || !
Int32.TryParse( kv["PlantTypeDescr iption"], out iPlantTypeID))
{
return null;
}

I receive the data that I hope to in the second menu.

The one million dollar question is, what's causing the second menu to
not populate when an option is selected from the first menu?

Thanks for your help.
John

~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~

<%@ Control Language="C#" AutoEventWireup ="true"
CodeBehind="pla ntgrid.ascx.cs"
Inherits="FPSwe b.usercontrols. plantgrid" %>
<%@ Register Assembly="AjaxC ontrolToolkit"
Namespace="Ajax ControlToolkit" TagPrefix="cc1" %>
<cc1:CascadingD ropDown ID="cddPlantTyp e" runat="server"
TargetControlID ="ddlPlantTypeI D" Category="Plant Types"
LoadingText="Lo ading Plant Types..." PromptText="Sel ect a Plant Type"
ServicePath="~/customcontrols/plantdetail.asm x"
ServiceMethod=" GetPlantTypes" />
<cc1:CascadingD ropDown ID="cddVarietyT ype" runat="server"
TargetControlID ="ddlVariety ID" Category="Varie ty Types"
LoadingText="Lo ading Plant Varieties..." PromptText="Sel ect a Plant
Variety" ServicePath="~/customcontrols/plantdetail.asm x"
ServiceMethod=" GetPlantVarieti es" ParentControlID ="ddlPlantTypeI D" />
<asp:ScriptMana ger ID="smCascading DropDown"
EnablePartialRe ndering="false" runat="server" />
<asp:DropDownLi st ID="ddlPlantTyp eID" runat="server" Width="326"></
asp:DropDownLis t><p />
<asp:DropDownLi st ID="ddlVarietyI D" runat="server" Width="326"></
asp:DropDownLis t>

using System;
using System.Data;
using System.Data.Sql Client;
using System.Web;
using System.Collecti ons;
using System.Collecti ons.Generic;
using System.Collecti ons.Specialized ;
using System.Web.Scri pt.Services;
using System.Web.Serv ices;
using System.Web.Serv ices.Protocols;
using System.Componen tModel;
using BusinessLayer;
using AjaxControlTool kit;

namespace FPSweb.customco ntrols
{
/// <summary>
/// Summary description for plantdetail
/// </summary>
[WebService(Name space = "http://tempuri.org/")]
[WebServiceBindi ng(ConformsTo = WsiProfiles.Bas icProfile1_1)]
[System.Web.Scri pt.Services.Scr iptService]
[ToolboxItem(fal se)]
public class plantdetail : System.Web.Serv ices.WebService
{
private string err;

#region methods

[WebMethod]
public CascadingDropDo wnNameValue[] GetPlantTypes(s tring
knownCategoryVa lues, string category)
{
DataTable dtPlantTable = Common.GetPlant Types(0, out err);
List<CascadingD ropDownNameValu evalues = new
List<CascadingD ropDownNameValu e>();
foreach (DataRow dr in dtPlantTable.Ro ws)
{
string sPlantTypeDescr iption =
(string)dr["PlantTypeDescr iption"];
int iPlantTypeID = (int)dr["PlantTypeI D"];
values.Add(new
CascadingDropDo wnNameValue(sPl antTypeDescript ion,
iPlantTypeID.To String()));
}
return values.ToArray( );
}

[WebMethod]
public CascadingDropDo wnNameValue[] GetPlantVarieti es(string
knownCategoryVa lues, string category)
{
StringDictionar y kv =
CascadingDropDo wn.ParseKnownCa tegoryValuesStr ing(knownCatego ryValues);

// string sPlantTypeID = "2";
// int iPlantTypeID = LT.Utils.CInt(s PlantTypeID);

int iPlantTypeID;
if (!kv.ContainsKe y("PlantTypeDes cription") || !
Int32.TryParse( kv["PlantTypeDescr iption"], out iPlantTypeID))
{
return null;
}

DataTable dtVarietyTable = Common.GetVarie ties(0,
iPlantTypeID, out err);

List<CascadingD ropDownNameValu evalues = new
List<CascadingD ropDownNameValu e>();
foreach (DataRow dr in dtVarietyTable. Rows)
{
string sVarietyDescrip tion =
(string)dr["varietyDescrip tion"];
int iVarietyID = (int)dr["varietyID"];
values.Add(new
CascadingDropDo wnNameValue(sVa rietyDescriptio n,
iVarietyID.ToSt ring()));
}

return values.ToArray( );
}

#endregion methods
}
}