Question

DropDownList in ListView fed from a separate datasource?

Asked by: jn1480

Our ListView control is bound to the Content table
In the InsertItem template (as well as the EditItem template eventually, etc...) we would like to populate a DropDownList control with the contents of the SiteMap table rather than using the standard textbox bound to the SiteMapID field in the Content Table.

However, when we run this page, we get the error "Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control." in reference to the line: "<asp:DropDownList ID="ddl1" runat="server" DataSourceID="dsSiteMap" DataTextField="Title_Nav" DataValueField="ID" SelectedValue='<%# Bind("SiteMapID") %>'></asp:DropDownList>"

This kind of setup works perfectly when using a DetailsView...
What am I missing here?

<asp:SqlDataSource ID="dsContent" runat="server" 
        ConnectionString="<%$ ConnectionStrings:csButtermoonArts %>" 
        DeleteCommand="DELETE FROM [Content] WHERE [ID] = @ID" 
        InsertCommand="INSERT INTO [Content] ([SiteMapID], [LocationID], [SortORder], [Content], [Authorized], [DateTime_Create], [DateTime_Update], [AuthorID]) VALUES (@SiteMapID, @LocationID, @SortORder, @Content, @Authorized, @DateTime_Create, @DateTime_Update, @AuthorID)" 
        SelectCommand="SELECT [ID], [SiteMapID], [LocationID], [SortORder], [Content], [Authorized], [DateTime_Create], [DateTime_Update], [AuthorID] FROM [Content] WHERE ([SiteMapID] = @SiteMapID) ORDER BY [LocationID], [SortORder]" 
        UpdateCommand="UPDATE [Content] SET [SiteMapID] = @SiteMapID, [LocationID] = @LocationID, [SortORder] = @SortORder, [Content] = @Content, [Authorized] = @Authorized, [DateTime_Create] = @DateTime_Create, [DateTime_Update] = @DateTime_Update, [AuthorID] = @AuthorID WHERE [ID] = @ID">
        <SelectParameters>
            <asp:QueryStringParameter Name="SiteMapID" QueryStringField="SiteMapID" 
                Type="Int32" />
        </SelectParameters>
        <DeleteParameters>
            <asp:Parameter Name="ID" Type="Int32" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="SiteMapID" Type="Int32" />
            <asp:Parameter Name="LocationID" Type="Int32" />
            <asp:Parameter Name="SortORder" Type="Int32" />
            <asp:Parameter Name="Content" Type="String" />
            <asp:Parameter Name="Authorized" Type="Boolean" />
            <asp:Parameter Name="DateTime_Create" Type="DateTime" />
            <asp:Parameter Name="DateTime_Update" Type="DateTime" />
            <asp:Parameter Name="AuthorID" Type="Int32" />
            <asp:Parameter Name="ID" Type="Int32" />
        </UpdateParameters>
        <InsertParameters>
            <asp:Parameter Name="SiteMapID" Type="Int32" />
            <asp:Parameter Name="LocationID" Type="Int32" />
            <asp:Parameter Name="SortORder" Type="Int32" />
            <asp:Parameter Name="Content" Type="String" />
            <asp:Parameter Name="Authorized" Type="Boolean" />
            <asp:Parameter Name="DateTime_Create" Type="DateTime" />
            <asp:Parameter Name="DateTime_Update" Type="DateTime" />
            <asp:Parameter Name="AuthorID" Type="Int32" />
        </InsertParameters>
    </asp:SqlDataSource>
 
 
 
    <asp:SqlDataSource ID="dsSiteMap" runat="server" 
        ConnectionString="<%$ ConnectionStrings:csButtermoonArts %>" 
        SelectCommand="SELECT [ID], [SortOrder], [Title_Head], [Title_Nav], [Description], [Keywords], [URL], [Authorized], [DateTime_Create], [DateTime_Update], [AuthorID] FROM [SiteMap] ORDER BY [SortOrder], [Title_Nav]"></asp:SqlDataSource>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    <asp:ListView ID="ListView1" runat="server" DataSourceID="dsContent" 
        DataKeyNames="ID" InsertItemPosition="LastItem">
        <ItemTemplate>
            <span style="">
            LocationID:
            <asp:Label ID="LocationIDLabel" runat="server" 
                Text='<%# Eval("LocationID") %>' />
            <br />
            SortOrder:
            <asp:Label ID="SortORderLabel" runat="server" Text='<%# Eval("SortORder") %>' />
            <br />
            <asp:CheckBox ID="AuthorizedCheckBox" runat="server" 
                Checked='<%# Eval("Authorized") %>' Enabled="false" Text="Authorized" />
            <br />
            <asp:Label ID="ContentLabel" runat="server" Text='<%# Eval("Content") %>' />
            <br />
            <asp:LinkButton ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />&nbsp;
            <asp:LinkButton ID="DeleteButton" runat="server" CommandName="Delete" 
                Text="Delete" />
            <hr />
            </span>
        </ItemTemplate>
        <AlternatingItemTemplate>
            <span style="">
            LocationID:
            <asp:Label ID="LocationIDLabel" runat="server" 
                Text='<%# Eval("LocationID") %>' />
            <br />
            SortOrder:
            <asp:Label ID="SortORderLabel" runat="server" Text='<%# Eval("SortORder") %>' />
            <br />
            <asp:CheckBox ID="AuthorizedCheckBox" runat="server" 
                Checked='<%# Eval("Authorized") %>' Enabled="false" Text="Authorized" />
            <br />
            <asp:Label ID="ContentLabel" runat="server" Text='<%# Eval("Content") %>' />
            <br />
            <asp:LinkButton ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />&nbsp;
            <asp:LinkButton ID="DeleteButton" runat="server" CommandName="Delete" 
                Text="Delete" />
            <hr />
            </span>
        </AlternatingItemTemplate>
        <EmptyDataTemplate>
            <span>No data was returned.</span>
        </EmptyDataTemplate>
        <InsertItemTemplate>
            <span style="">
            Add new content:<br /><br />
            SiteMapID:
            <asp:DropDownList ID="ddl1" runat="server" DataSourceID="dsSiteMap" DataTextField="Title_Nav" DataValueField="ID" SelectedValue='<%# Bind("SiteMapID") %>'></asp:DropDownList>
            
 
            <br />
            LocationID:
            <asp:TextBox ID="LocationIDTextBox" runat="server" 
                Text='<%# Bind("LocationID") %>' />
            <br />
            SortORder:
            <asp:TextBox ID="SortORderTextBox" runat="server" 
                Text='<%# Bind("SortORder") %>' />
            <br />
            Content:
            <FCKeditorV2:FCKeditor ID="ContentTextBox" runat="server" BasePath="~/fckeditor/" Value='<%# Bind("Content")%>' Height="300" Width="535" ToolbarCanCollapse="true" ToolbarStartExpanded="true"></FCKeditorV2:FCKeditor>
            <br />
            <asp:CheckBox ID="AuthorizedCheckBox" runat="server" 
                Checked='<%# Bind("Authorized") %>' Text="Authorized" />
            <br />
            <asp:Button ID="InsertButton" runat="server" CommandName="Insert" 
                Text="Insert" />
            <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" 
                Text="Clear" />
            <br />
            <br />
            <hr />
            </span>
        </InsertItemTemplate>
        <LayoutTemplate>
            <div ID="itemPlaceholderContainer" runat="server" style="">
                <span ID="itemPlaceholder" runat="server" />
            </div>
            <div style="">
                <asp:DataPager PageSize="15" ID="DataPager1" runat="server">
                    <Fields>
                        <asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" 
                            ShowLastPageButton="True" />
                    </Fields>
                </asp:DataPager>
            </div>
        </LayoutTemplate>
        <EditItemTemplate>
            <span style="">ID:
            <asp:Label ID="IDLabel1" runat="server" Text='<%# Eval("ID") %>' />
            <br />
            SiteMapID:
            <asp:TextBox ID="SiteMapIDTextBox" runat="server" 
                Text='<%# Bind("SiteMapID") %>' />
            <br />
            LocationID:
            <asp:TextBox ID="LocationIDTextBox" runat="server" 
                Text='<%# Bind("LocationID") %>' />
            <br />
            SortORder:
            <asp:TextBox ID="SortORderTextBox" runat="server" 
                Text='<%# Bind("SortORder") %>' />
            <br />
            Content:
            <FCKeditorV2:FCKeditor ID="ContentTextBox" runat="server" BasePath="~/fckeditor/" Value='<%# Bind("Content")%>' Height="300" Width="535" ToolbarCanCollapse="true" ToolbarStartExpanded="true"></FCKeditorV2:FCKeditor>
            <br />
            <asp:CheckBox ID="AuthorizedCheckBox" runat="server" 
                Checked='<%# Bind("Authorized") %>' Text="Authorized" />
            <br />
            <asp:LinkButton ID="UpdateButton" runat="server" CommandName="Update" 
                Text="Update"  />
            <asp:LinkButton ID="CancelButton" runat="server" CommandName="Cancel" 
                Text="Cancel" />
            <br />
            <br />
            <hr />
            </span>
        </EditItemTemplate>
        <SelectedItemTemplate>
            <span style="">ID:
            <asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' />
            <br />
            SiteMapID:
            <asp:Label ID="SiteMapIDLabel" runat="server" Text='<%# Eval("SiteMapID") %>' />
            <br />
            LocationID:
            <asp:Label ID="LocationIDLabel" runat="server" 
                Text='<%# Eval("LocationID") %>' />
            <br />
            SortORder:
            <asp:Label ID="SortORderLabel" runat="server" Text='<%# Eval("SortORder") %>' />
            <br />
            Content:
            <asp:Label ID="ContentLabel" runat="server" Text='<%# Eval("Content") %>' />
            <br />
            <asp:CheckBox ID="AuthorizedCheckBox" runat="server" 
                Checked='<%# Eval("Authorized") %>' Enabled="false" Text="Authorized" />
            <br />
            DateTime_Create:
            <asp:Label ID="DateTime_CreateLabel" runat="server" 
                Text='<%# Eval("DateTime_Create") %>' />
            <br />
            DateTime_Update:
            <asp:Label ID="DateTime_UpdateLabel" runat="server" 
                Text='<%# Eval("DateTime_Update") %>' />
            <br />
            AuthorID:
            <asp:Label ID="AuthorIDLabel" runat="server" Text='<%# Eval("AuthorID") %>' />
            <br />
            <asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
            <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" 
                Text="Delete" />
            <br />
            <br />
            </span>
        </SelectedItemTemplate>
    </asp:ListView>

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Asked On: 2009-01-10 at 14:40:47ID24041490
Tags: asp.net
,; ListView Control
Topic: Programming for ASP.NET
Participating Experts: 1
Points: 500
Comments: 6

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Answers

by: Juan_BarreraPosted on 2009-01-10 at 16:11:04ID: 23346035

Hi there,

You are not missing anything, is an issue with ASP.NET (see, for example, http://www.webswapp.com/codesamples/aspnet20/dependentlists/default.aspx)

Try to bind the value in code behind. I'm not sure where from you want to get the SiteMapId, so I took the ListView Datasource, but you, of it's wrong, at least you'll get the idea:

 Protected Sub ListView1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles ListView1.ItemDataBound
        If ListView1.InsertItem IsNot Nothing Then
            Dim ddl As DropDownList = CType(ListView1.InsertItem.FindControl("ddl1"), DropDownList)
            Dim dataItem As ListViewDataItem = CType(e.Item, ListViewDataItem)
            Dim value As String = DataBinder.Eval(dataItem, "SiteMapID")
            For i As Integer = 0 To ddl.Items.Count - 1
                Dim item As ListItem = ddl.Items(i)
                If item.Value = value Then
                    item.Selected = True
                    Exit For
                End If
            Next
        End If
    End Sub

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by: jn1480Posted on 2009-01-13 at 06:05:55ID: 23362641

I'm sorry if I'm being a newbie pain Juan - but I'm just not sure I see how to adjust this?

I am trying to populate the ddl1 control with data from the dsSiteMap datasource (see code lines 39-41 in my original post) I'm not sure what to edit in your posted code to get that to happen?

by: Juan_BarreraPosted on 2009-01-13 at 08:18:27ID: 23364269

<asp:DropDownList ID="ddl1" runat="server" DataSourceID="dsSiteMap" DataTextField="Title_Nav"
DataValueField="ID">
</asp:DropDownList>

Protected Sub ListView1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles ListView1.ItemDataBound
If ListView1.InsertItem IsNot Nothing Then
Dim ddl As DropDownList = CType(ListView1.InsertItem.FindControl("ddl1"), DropDownList)
ddl.DataBind()
End If
End Sub

by: jn1480Posted on 2009-01-13 at 12:00:14ID: 23366582

That does the job of populating the ddl1!

But upon insert, we get an error about cannot insert NULL value into SiteMapID column in the content database. So obviously we are not successfully passing the value from the ddl1 to the insert statement?

How do I handle that?

by: Juan_BarreraPosted on 2009-01-14 at 08:09:32ID: 23374106

The insert parameters are not referencing controls:

<InsertParameters>
<asp:Parameter Name="SiteMapID" Type="Int32" />
<asp:Parameter Name="LocationID" Type="Int32" />
<asp:Parameter Name="SortORder" Type="Int32" />
<asp:Parameter Name="Content" Type="String" />
<asp:Parameter Name="Authorized" Type="Boolean" />
<asp:Parameter Name="DateTime_Create" Type="DateTime" />
<asp:Parameter Name="DateTime_Update" Type="DateTime" />
<asp:Parameter Name="AuthorID" Type="Int32" />
</InsertParameters>

My suggestion: Use the Inserting event of the SqlDataSource instead.
To do that, remove all the Insert Parameters I copied above and, in code behind, find the controls that you want to reference, create, and add the parameters using their values. I'll give you an example to do one, you should be able to handle the others:

Protected Sub dsContent_Inserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceCommandEventArgs) Handles dsContent.Inserting
  Dim ListViewItem As ListViewItem = ListView1.InsertItem
  Dim ddl As DropDownList = CType(ListViewItem.FindControl("ddl1"), DropDownList)
  Dim param As SqlParameter = e.Command.CreateParameter
  param.Value = CInt(ddl.SelectedValue)
  param.SqlDbType = SqlDbType.Int
  param.Direction = ParameterDirection.Output
  param.ParameterName = "SiteMapId"
  'Find the other controls and add the parameters here:
End Sub

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DropDownList in ListView fed from a separate datasource?

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asp.net

ListView Control

Programming for ASP.NET

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