Hello all,

  I have place a dropdownlist with some values in the EditItemTemplate of my datagrid(AutoPostBack = True).

<asp:datagrid id=dg1 style="Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 8px" runat="server" OnItemDataBound="ComputeSum" ShowFooter="True" DataMember="Inventory" DataSource="<%# DsInventory1 %>" GridLines="Horizontal" CellPadding="3" BackColor="White" BorderWidth="1px" BorderStyle="None" BorderColor="#E7E7FF">
                <FooterStyle ForeColor="#4A3C8C" BackColor="#B5C7DE"></FooterStyle>
                <SelectedItemStyle Font-Bold="True" ForeColor="#F7F7F7" BackColor="#738A9C"></SelectedItemStyle>
                <AlternatingItemStyle BackColor="#F7F7F7"></AlternatingItemStyle>
                <ItemStyle ForeColor="#4A3C8C" BackColor="#E7E7FF"></ItemStyle>
                <HeaderStyle Font-Bold="True" ForeColor="#F7F7F7" BackColor="#4A3C8C"></HeaderStyle>
                <Columns>
                    <asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit"></asp:EditCommandColumn>
                    <asp:TemplateColumn HeaderText="Test Template Column">
                        <EditItemTemplate>
                            <asp:DropDownList id="ddl1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlSelectionChanged">
                                <asp:ListItem Value="1">One</asp:ListItem>
                                <asp:ListItem Value="2">Two</asp:ListItem>
                                <asp:ListItem Value="3">Three</asp:ListItem>
                            </asp:DropDownList>
                        </EditItemTemplate>
                    </asp:TemplateColumn>
                </Columns>
                <PagerStyle HorizontalAlign="Right" ForeColor="#4A3C8C" BackColor="#E7E7FF" Mode="NumericPages"></PagerStyle>
            </asp:datagrid>


I have also add this to the HTML of the EditItemeTemplate
OnSelectedIndexChanged="ddlSelectionChanged"

In my code behind I define the procedure
Protected Sub ddlSelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim ddl As DropDownList
        ddl = CType(sender, DropDownList)
        Label1.Text = ddl.SelectedItem.Text

End Sub

When I put a row into edit mode, and select a different value in my dropdownlist, the autopostback happens. However, my ddlSelectionChanged sub does not fire. Does anyone know why? What am I missing or doing wrong? As you can see I want to grab the changed value and display it in a label.

Thanks,

Jim

Where are you binding your data? In Page_Load?

If so, make sure you only bind when PostBack is not true:

If Not Page.IsPostBack Then
' Bind data here
End If

You probably wipe out your drop-down by rebinding it on every page load....

HtH,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.
While typing this post, I was listening to: Dying Slowly by Tindersticks (Track 1 from the album: Can our love...) What's This?

Thanks for the response however this is not my problem. The data is entered in the collections class of the control.

The problem is that when the selection is changed in the dropdown list, the event I created does not fire.

Without seeing the rest of the code, the situation could still apply.

When you rebind the parent on post back, the drop down control is overwritten as well. Thus you loose the old selected index and thus SelectedIndexChanged will never fire.

Can you post some more code?

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

Again the data is NOT bound. All the code is posted. If this could be the problem, then I will bind the data. But is should not matter I think.

Jim,

Perhaps Imar means the binding for the datagrid. We see that you have explicitly defined asp:listitem tags for the DDL. However, at some point that grid has to be bound. I haven't often set a datasource in the markup attributes for a grid, I usually bind such controls in code behind.

Is it possible that the grid data is being loaded every time the page runs and/or the grid is being bound every time? When you set an attribute data source, I'm not sure where the bind actually occurs. I assume that somewhere along the line, ASP.NET calls the page's DataBind method which then processes those <%# ...%> databind tags.

Please tell us more about the "DsInventory1" variable and how it is being populated.

-Peter

   Imar, sorry, I was not understanding what you meant in your reply. Thanks to Peter I see you were referring to the DG not the DDL.
   Your response was correct! This was a quick test page and I forgot to use If Not IsPostBack Then and that is why I hardcoded some DDL values.

Thanks again Imar and Peter!!!!!

No problem. I could have clarified what binding code I was referring to.

Anyway, glad it's working now.

Cheers,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.