How to do this CascadingDropDown?

**nsoni** · 04-19-2009 10:00 AM

Hello,
I am trying to select Date OF Birth on a WEB FORM from three DropdownList control like YEAR MONTH and DAY respectively, I want that when i select month FEBRUARY then the DAY dropdownlist control should list the no .of day according to YEAR i mean if it is leap year bla bla bla.

For this I m using AJAX cascading dropdown where i am not getteing response. The following are the code and webservices where DAY dropdown gets disabled becasue it doesnot get the value selected from YEAR or MONTH dropdown.
Can anybody see this and let me know

''''''''''''''''''''''.aspx code

HTML Code:

<asp:DropDownList ID="ddlDOByear" runat="server" ></asp:DropDownList>
<asp:DropDownList ID="ddlDOBmon" runat="server"></asp:DropDownList>
<asp:DropDownList ID="ddlDOBday" runat="server"></asp:DropDownList>
                            
<ajaxToolkit:CascadingDropDown id="CascadingDropDown1" runat="server" category="Year" prompttext="Year" ServiceMethod="GetDOBYears" ServicePath="WebService.asmx" TargetControlId="ddlDOByear" />

<ajaxToolkit:CascadingDropDown id="CascadingDropDown2" runat="server" category="MONTH" prompttext="Month" ServiceMethod="GetDOBMonths" ServicePath="WebService.asmx" TargetControlId="ddlDOBmon" />

<ajaxToolkit:CascadingDropDown id="CascadingDropDown3" runat="server" category="Day" LoadingText="Loading Days...." prompttext="Days" ServiceMethod="GetDOBDays" 
ServicePath="WebService.asmx" TargetControlId="ddlDOBday" />

'''''Web services code...............

Code:

Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Collections
Imports System.Collections.Generic
Imports System.Collections.Specialized
Imports AjaxControlToolkit
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
<System.Web.Script.Services.ScriptService()> _
<WebService(Namespace:="http://nerdliness.com/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class WebService
    Inherits System.Web.Services.WebService
    Public imon As Integer

    <WebMethod()> _
    Public Function GetDOBYears(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()
        Dim i As New Long
        Dim txtyrs As String
        Dim mydobyear As New List(Of CascadingDropDownNameValue)
        For i = 1 To 90
            txtyrs = ""
            txtyrs = Year(Now()) - i
            mydobyear.Add(New CascadingDropDownNameValue(txtyrs, txtyrs))
        Next
        Return mydobyear.ToArray
    End Function

    <WebMethod()> _
        Public Function GetDOBMonths(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()
        Dim txtmon As String
        Dim mydobmonth As New List(Of CascadingDropDownNameValue)
        For imon = 1 To 12
            txtmon = ""
            txtmon = MonthName(imon)
            mydobmonth.Add(New CascadingDropDownNameValue(txtmon, imon))
        Next
        Return mydobmonth.ToArray
    End Function

    <WebMethod()> _
        Public Function GetDOBDays(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()
        Dim i As Long
        Dim txtdays As String
        Dim totday As Long

        Dim kvDays As StringDictionary = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues)

        Dim intMonthid As Integer
        If Not kvDays.ContainsKey("MONTH") Or Not Int32.TryParse(kvDays("MONTH"), intMonthid) Then
            Return Nothing
        End If
        Dim mydobday As New List(Of CascadingDropDownNameValue)

        If intMonthid = 0 Then
            totday = 31
        Else
            totday = 30
        End If
        For i = 1 To totday
            txtdays = ""
            txtdays = i
            mydobday.Add(New CascadingDropDownNameValue(txtdays, txtdays))
        Next
        Return mydobday.ToArray
    End Function

End Class

When i RUN this project i can see that YEAR MONTH are doing fine but DAY remains disabled even if i change month from the list.

Can u please ahve a look where is the problem.

Thanx and Kind Regards
nsoni

**blackdots** · 11-18-2009 11:56 PM

I have the same problem, some one tell me remove the loadingText in 1st Dropdownlist but it still doesn't word. Some body help me plz !

**blackdots** · 11-19-2009 12:02 AM

<asp

ropDownList id="ddlcities" runat="server"></asp:dropdownlist>
<ajaxToolkit:CascadingDropDown id="cascadingdropdown1" runat="server" Category="name"
LoadingText="[Đang tải...]" PromptText="[Chọn Tỉnh/Thành phố]" ServiceMethod="GetDropDownCities"
ServicePath="services/commonServices.asmx" TargetControlID="ddlCities">
</ajaxToolkit:CascadingDropDown>

-------------------------------------------------------------------------

<asp:dropdownlist id="ddlDistrict" runat="server" Enabled="True"></asp:dropdownlist>
<ajaxToolkit:CascadingDropDown ID="cascadingdropdown2" runat="server" Category="name"
LoadingText="[Đang tải...]" ParentControlID="ddlCities" PromptText="[Chọn Quận/Huyện]"
ServicePath="services/commonServices.asmx" ServiceMethod="GetDropDownDistrict"
TargetControlID="Dropdownlist1">
</ajaxtoolkit:cascadingdropdown>

---------------------------------------------------------------

[WebMethod]
[System.Web.Script.Services.ScriptMethod]
public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownCities(string knownCategoryValues, string category)
{
try
{
SqlConnection sqlConn = new SqlConnection(conStr);
sqlConn.Open();
SqlCommand sqlSelect = new SqlCommand("SELECT * FROM hanhchinh where parentid is null order by alias asc", sqlConn);
sqlSelect.CommandType = System.Data.CommandType.Text;
SqlDataAdapter sqlAdapter = new SqlDataAdapter(sqlSelect);
DataSet myDataset = new DataSet();
sqlAdapter.Fill(myDataset);
sqlConn.Close();
List<AjaxControlToolkit.CascadingDropDownNameValue > cascadingValues = new List<AjaxControlToolkit.CascadingDropDownNameValue >();
foreach (DataRow dRow in myDataset.Tables[0].Rows)
{
string categoryID = dRow["id"].ToString();
string categoryName = dRow["name"].ToString();
cascadingValues.Add(new AjaxControlToolkit.CascadingDropDownNameValue(cate goryName, categoryID));
}
return cascadingValues.ToArray();
}
catch
{
throw new Exception("ko biet loi");
}
}

------------------------------------------------------------------------

[WebMethod]
[System.Web.Script.Services.ScriptMethod]
public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownDistrict(string knownCategoryValues, string category)
{
int categoryID;
StringDictionary categoryValues = AjaxControlToolkit.CascadingDropDown.ParseKnownCat egoryValuesString(knownCategoryValues);
categoryID = Convert.ToInt32(categoryValues["id"]);
SqlConnection sqlConn = new SqlConnection(conStr);
sqlConn.Open();
SqlCommand sqlSelect = new SqlCommand("SELECT * FROM hanhchinh where parentid = @categoryID", sqlConn);
sqlSelect.CommandType = System.Data.CommandType.Text;
sqlSelect.Parameters.Add("@categoryID", SqlDbType.Int).Value = categoryID;
SqlDataAdapter sqlAdapter = new SqlDataAdapter(sqlSelect);
DataSet myDataset = new DataSet();
sqlAdapter.Fill(myDataset);
sqlConn.Close();
List<AjaxControlToolkit.CascadingDropDownNameValue > cascadingValues = new List<AjaxControlToolkit.CascadingDropDownNameValue >();
foreach (DataRow dRow in myDataset.Tables[0].Rows)
{
string productID = dRow["id"].ToString();
string productName = dRow["name"].ToString();
cascadingValues.Add(new AjaxControlToolkit.CascadingDropDownNameValue(prod uctName, productID));
}
return cascadingValues.ToArray();
}

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