Dropdownlist not declared in script when DDL is in DetailsView

ola123 · Oct 19, 2007

Hello guys,
thanks for the help in advance

My problem is that whatever input or selection control i have in the detailsview (specifically in the edititemtemplate) the control's ID id never declared in the script. What could be the reason for this?

I was thinking that probably a function is to be returned to the script (thats just my guess anyway).

My code is below, the purpose is to have a dropdownlist that populates another DDL

Code:

<script runat="server">
    Sub Generate(ByVal a As Object, ByVal y As EventArgs)
        
        Dim ddl As DropDownList
        Dim ddl2 As DropDownList
        Dim lbl As Label
        
        If ddl.SelectedValue = 1 Then
            lbl.Text = "value 1 selected"
            ddl2.Items.Clear()
            ddl2.Items.Add(New ListItem("CABS", "1"))
            ddl2.Items.Add(New ListItem("MIS", "2"))
        ElseIf ddl.SelectedValue = 2 Then
            lbl.Text = "value 2 selected"
            ddl2.Items.Clear()
            ddl2.Items.Add(New ListItem("BBA", "1"))
            ddl2.Items.Add(New ListItem("ADB", "2"))
        End If             
    End Sub
</script>

<html>
<head runat="server">
    <title>Nested Dropdownlist</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:AccessDataSource ID="ADS" runat="server" DataFile="registry.mdb"
            SelectCommand="SELECT * FROM CSDept ">
        </asp:AccessDataSource>
        
        <asp:Detailsview runat="server" id="DV" DataSourceID="ADS"
        allowpaging=true AutoGenerateRows=false AutoGenerateEditButton=true >
                
        <fields>
            <asp:BoundField
            headertext="ID No."
            datafield="id" />
            
            <asp:boundfield
            headertext="First Name"
            datafield="fname"/>
            
            <asp:boundfield
            headertext="Last Name"
            datafield="lname"/>
            
            <asp:templatefield HeaderText="Programme">
                <editItemTemplate>
                    <asp:DropDownList ID="DDL" runat="server" AutoPostBack=true OnTextChanged="generate">
                        <asp:ListItem Value=1>Computer</asp:ListItem>
                        <asp:ListItem Value=2>Business</asp:ListItem>
                    </asp:DropDownList>
        
                    <asp:dropdownlist runat="server" ID="ddl2" Width="100"></asp:dropdownlist>
                </editItemTemplate>
            </asp:templatefield>
        
        </fields>
        
        </asp:detailsview>
     </form>
</body>
</html>

Thanks for the help in advance
Peace

Cool Nuh Man

tperri · Oct 19, 2007

You need to assign that DropDownList to a variable. Look at "FindControl" to do this.

google "asp.net dropdownlist edit template findcontrol" for some help.

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Dropdownlist not declared in script when DDL is in DetailsView

ola123

Technical User

tperri

Programmer

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