Add FilteredTextBoxExtender problem

Question

User1510859543 posted

I am trying to add a FilteredTextBoxExtender via code in a ListView and it is not working (not throwing error either).  My code is below. Am I missing something?  Thanks.

    Protected Sub lvSchedule_ItemDataBound(sender As Object, e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles lvSchedule.ItemDataBound

                Dim fextender As AjaxControlToolkit.FilteredTextBoxExtender = New AjaxControlToolkit.FilteredTextBoxExtender
                Dim tb As TextBox = CType(lvSchedule.FindControl("txtCarbLiquid"), TextBox)
                fextender.FilterMode = AjaxControlToolkit.FilterModes.ValidChars
                fextender.ValidChars = "0123456789"
                fextender.TargetControlID = tb.ID

                lvSchedule.Controls.Add(fextender)

    END Sub

Answer 1

User2103319870 posted

You need to have Ajax ToolkitScriptManager prior to using filter extender. Also instead of adding the filterexteder control from code behind you can add from aspx page like given below

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </asp:ToolkitScriptManager>
    <asp:ListView ID="ListView1" runat="server" GroupPlaceholderID="groupPlaceHolder1" DataSourceID="SqlDataSource1"
        ItemPlaceholderID="itemPlaceHolder1">
        <ItemTemplate>
            <table border="1" width="50%">
                <tr>
                    <td style="width: 50%">
                        <asp:TextBox ID="txtCarbLiquid" Text='<%#Eval("AddressID") %>' runat="server"></asp:TextBox><br />
                        <asp:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" TargetControlID="txtCarbLiquid" FilterMode="ValidChars" ValidChars="0123456789" runat="server">
                        </asp:FilteredTextBoxExtender>
                    </td>
                    <td style="width: 50%">
                        <asp:Label ID="LabelDOB" runat="server" CssClass="Label" Text='<%#Eval("AddressLine1") %>' /><br />
                    </td>
                </tr>
            </table>
        </ItemTemplate>
        <LayoutTemplate>
            <table>
                <asp:PlaceHolder runat="server" ID="groupPlaceHolder1"></asp:PlaceHolder>
                <table>
        </LayoutTemplate>
        <GroupTemplate>
            <tr>
                <asp:PlaceHolder runat="server" ID="itemPlaceHolder1"></asp:PlaceHolder>
            </tr>
        </GroupTemplate>
    </asp:ListView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:AdventureWorks2008R2ConnectionString %>"
        DataSourceMode="DataReader" SelectCommand="SELECT top 10 [AddressID], [AddressLine1], [AddressLine2] FROM Person.[Address]">
    </asp:SqlDataSource>

Answer 2

User1510859543 posted

I do have the ToolkitScriptManager but it is on the master page. Does that matter?  I don't think I can have it on both master and content page.  I need to do it in code because I am exporting the ListView into html and sending on email and it fails if I use the filter directly on the aspx page.

Answer 3

User1918509225 posted

Hi dlchase,

Yes you are right ,you just can have only one TookitScriptManager  in your page.

FilteredTextboxExtender is used  to restrict what kind of value you can type in your textbox.

It seems that it 's not  related with exporting the listview  into html.

Could you explain more details on your error when you export listview into html ?

Best Regards,

Kevin Shen.

Answer 4

User1510859543 posted

I get the following exception error.

An unhandled exception occurred:
Message: Extender control 'FilteredTextBoxExtender1' is not a registered extender control. Extender controls must be registered using RegisterExtenderControl() before calling RegisterScriptDescriptors().
Parameter name: extenderControl

It happens in code-behind where I am saving a DIV (called mainDiv) content to html for inserting into an email that goes out to a client.  The error comes from the following code.

        Dim sw As New StringWriter()
        Dim w As New HtmlTextWriter(sw)
        mainDiv.RenderControl(w)

        Dim s As String = sw.GetStringBuilder().ToString()

Answer 5

User1510859543 posted

Must have stumped everyone on this.