Changing header text

[David Penny]

Hi,

I'm posting this under grid, but it probably applies to other controls as well.

I'm working on a routine which changes labels on ASP.Net pages to configure terminology for various customers. In order to do this I iterate through all controls on screen recursively and change the label text if needed.

I was wondering is it possible to do the same with the elements of a RadGrid such as the header text?

The core of the replacement routine at present is:

Public Sub ReplaceText(ByRef myControls As ControlCollection)
        Dim ReplacementText As String = HttpContext.Current.Session("ReplacementText")
        If String.IsNullOrEmpty(ReplacementText) Then Exit Sub
        Dim ReplacementTextUpper As String = ReplacementText.ToUpper
        For Each myControl As Control In myControls
            If TypeOf myControl Is Label Then
                Dim lbl As Label = CType(myControl, Label)
                Dim labelText As String = String.Format("[{0}", lbl.Text.Trim.ToUpper)
                Dim textPosition As Integer = InStr(ReplacementTextUpper, labelText)
                If labelText <> "[" And textPosition > 0 Then
                    'Parse ReplacementText for = and > sign and get string between
                    Dim Pos1 = ReplacementText.IndexOf("=", textPosition)
                    Dim Pos2 = ReplacementText.IndexOf("]", Pos1)
                    Dim ReplaceWith As String = ReplacementText.Substring(Pos1 + 1, (Pos2 - Pos1) - 1)
                    lbl.Text = ReplaceWith
                End If
            End If
            If myControl.HasControls Then
                ReplaceText(myControl.Controls)
            End If
        Next
    End Sub

I have tried accessing a RadGrid as a control, but it is defined as a Telerik.Web.UI control. Would that mean I need another routine that passes the Rad Controls for parsing? Is what I am trying to do even possible?

David Penny

[Shinu]

Hi,

Try looping through the headeritems in ItemDataBound event as shown below.
VB:

Protected Sub RadGrid1_ItemDataBound(sender As Object, e As GridItemEventArgs)
    For Each item As GridHeaderItem In RadGrid1.MasterTableView.GetItems(GridItemType.Header)
        item("Uniquename").Text = "some text"
    Next
End Sub

Thanks,
Shinu

[David Penny]

Hi Shinu,

How do I find the text of each item? Until I iterate thnrough the items in the Grid header I don't know if the text needs replacing.

I need to get the text property of each header column without knowing the name of it. Can I do this with a numeric index such as item(0).text, and if so, I don't seem to be able to find how to get the count of items in the header.

David Penny

[Shinu]

Hi,

Try the following code.
VB:

Protected Sub RadGrid1_ItemDataBound(sender As Object, e As GridItemEventArgs)
    For Each col As GridColumn In RadGrid1.Columns
        If TypeOf e.Item Is GridHeaderItem Then
            Dim header As GridHeaderItem = DirectCast(e.Item, GridHeaderItem)
            Dim text As String = header(col.UniqueName).Text
        End If
    Next
End Sub

Thanks,
Shinu

[David Penny]

Hi Shinu,

That kind of words, except the text property is returning nothing - except for the first column which returns &nbsp.

In case it's something to do with my grid definition it's below:

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="False" GridLines="None"
            AllowFilteringByColumn="True" AllowSorting="True" ShowGroupPanel="True"
            ShowFooter="True">
            <ClientSettings>
                <Scrolling AllowScroll="True" UseStaticHeaders="True" />
            </ClientSettings>
            <HeaderContextMenu>
                <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation>
            </HeaderContextMenu>
            <MasterTableView DataKeyNames="UniqueID" CommandItemDisplay="Top">
                <CommandItemSettings ExportToPdfText="Export to PDF"></CommandItemSettings>
                <RowIndicatorColumn>
                    <HeaderStyle Width="20px" />
                </RowIndicatorColumn>
                <ExpandCollapseColumn>
                    <HeaderStyle Width="20px" />
                </ExpandCollapseColumn>
                <Columns>
                    <telerik:GridTemplateColumn UniqueName="TemplateEditColumn" AllowFiltering="False">
                        <ItemTemplate>
                            <asp:HyperLink ID="EditLink" runat="server" Text="Edit"></asp:HyperLink>
                        </ItemTemplate>
                        <FooterStyle Width="32px" />
                        <HeaderStyle Width="32px" />
                        <ItemStyle Width="32px" />
                    </telerik:GridTemplateColumn>
                    <telerik:GridBoundColumn DataField="Project" HeaderText="Project" SortExpression="Project"
                        UniqueName="Project">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="Name" HeaderText="Name" SortExpression="Name"
                        UniqueName="Name">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="Client" HeaderText="Client" SortExpression="Client"
                        UniqueName="Client">
                    </telerik:GridBoundColumn>
... etc

[Kostadin]

Hello David,

When sorting is enabled the HeaderItem contains a LinkButton and its text should be changed. Check out the following code snippet.

protected void RadGrid1_PreRender(object sender, EventArgs e)
    {
        GridHeaderItem headerItem = RadGrid1.MasterTableView.GetItems(GridItemType.Header)[0] as GridHeaderItem;
        foreach (GridColumn col in RadGrid1.MasterTableView.Columns)
        {
            if (headerItem[col.UniqueName].Controls[0] is LinkButton)
            {
                (headerItem[col.UniqueName].Controls[0] as LinkButton).Text = (headerItem[col.UniqueName].Controls[0] as LinkButton).Text + " Your text";
            }
        }
    }

Kind regards,
Kostadin
the Telerik team

[David Penny]

Thanks Kostadin,

That solution works great.

As a matter of interest, what type would I used to check if the header is an ordinary item (not sortable?). This would allow me to create a generic routine that works for both sortable and non-sortable columns.

Thanks.

David Penny

[Kostadin]

Hi David,

When sorting is disabled you have to change the cell text only as Shinu suggested. You could check whether the header item contains a control in it.

I hope this information helps.

All the best,
Kostadin
the Telerik team