2023-07-19

ASP.Net - ListView - Add A DropdownList

A dropdown list if pretty simple - it works practically the same as it wound on a normal form.

<InsertItemTemplate>
    <tr>
        <td></td>
        <td><asp:DropDownList 
                id="DropDownList_TableCode"
                runat="server"
                autopostback="true">
                <asp:ListItem></asp:ListItem>
                <asp:ListItem>Invoice</asp:ListItem>
                <asp:ListItem>AdditionalAttribute</asp:ListItem>
             </asp:DropDownList>
        </td>
:

One problem, is it doesn’t bind very well to a list view control. Consequently if you have one in the InsertItemTemplate you need to add a routine to move it’s contents to a database on save. This is done with the item inserting event.

Protected Sub lv_VendorAccount_ImportSpecs_ItemInserting( _
  ByVal sender As Object, _
  ByVal e As System.Web.UI.WebControls.ListViewInsertEventArgs) _
   Handles lv_VendorAccount_ImportSpecs.ItemInserting

        Dim TableCode As String _
            = CType(lv_VendorAccount_ImportSpecs.InsertItem.FindControl("DropDownList_TableCode"), DropDownList).SelectedValue.ToString
        e.Values("TableCode") = TableCode
End Sub

Another problem, is you cannot simply doubleclick the control to bring you to code. I have a template that I paste into the code whenwever I add a dropdown with an autopostback set to true

Protected Sub ddlx_SelectedIndexChanged( _
  ByVal sender As Object, _
  ByVal e As System.EventArgs) _
    Handles ddlx.SelectedIndexChanged
    '
End Sub

Adding a dropdown control to a ListView