dynamically adding griddataitem

[debbie f]

I am converting an existing datagrid to a radgrid.  During PreRender, I dynamically add a new row and set the cell with some text with a colspan to match the visible columns.  For some reason, this does not work with a radgrid.  The new row is created (I can view source of the rendered html and see the <tr> tags), but the cell is not added to the row when rendered.

Here is my code snippet:

int cols = 11;
foreach (GridItem dItem in gridResults.Items)
{
    if (dItem.ItemType == GridItemType.Item || dItem.ItemType == GridItemType.AlternatingItem)
        {
            GridDataItem item = new GridDataItem(gridResults.MasterTableView, 0, 0, dItem.ItemType);
               
        TableCell cell = new TableCell();
                cell.ColumnSpan = cols;
                cell.HorizontalAlign = HorizontalAlign.Justify;
                cell.Text = ((DataRowView)dItem.DataItem)["Description"].ToString();

              item.Cells.Add(cell);
                       
                int iPos = 0;
                foreach (GridItem dgitem in dItem.Parent.Controls)
                {
                    if (dgitem == dItem)
                        {
                            dItem.Parent.Controls.AddAt(iPos + 1, item);
                                break;
                        }
                        iPos++;
                }
         }
}

Suggestions?  I am looking at the nestedviewtemplate, but I don't want users to have access to expand/collapse the section.  I don't see a way to hide the expansion control in the grid.

[Shinu]

Hi,

You can refer the following help article to get details about hiding the expand/collapse button.
Hiding expand/collapse images when no records

Shinu.

[debbie f]

But there is no reasoning for why the output of the cells should work?  It's just very odd that it will add the row to the html output during prerender, but not a cell.

[Yavor]

Hi debbie f,

Basically, it is not recommended to add rows in a similar manner. Another approach that you can take would be to include an empty row to the underlying datasource, at the relevant position. Subsequently, you can span the row as per your needs.

Sincerely yours,
Yavor
the Telerik team

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[debbie f]

I'm not having much luck in hiding the expand image.  I've setup my radgrid with a nestedviewtemplate as follow:

<telerik:RadGrid ID="gridResults" Runat="server" AllowSorting="True" AllowPaging="True" AllowFilteringByColumn="True"
                    OnSortCommand="mSortGrid" OnPageIndexChanged="mChangePage" OnPreRender="mAddDescription"
                    OnItemDataBound="gridItemDataBound" OnItemCommand="gridResults_ItemCommand" OnNeedDataSource="gridResults_NeedDataSource">
                        <MasterTableView AllowNaturalSort="false" DataKeyNames="id" HierarchyLoadMode="ServerBind" HierarchyDefaultExpanded="true">
                            <Columns>
                                <telerik:GridTemplateColumn FilterListOptions="VaryByDataType" DataType="System.Int32" SortExpression="id" DataField="id" UniqueName="id" HeaderText="ID" ItemStyle-VerticalAlign="Top">
                                    <ItemTemplate>
                                        <asp:LinkButton CssClass="smallLink" ID="LinkButton2" runat="server" OnCommand="mLoadJob">
                                            <%# DataBinder.Eval(Container.DataItem, "id") %>
                                         </asp:LinkButton><img src="images/1x1.gif" width="1" alt="spacer" title="spacer" />
                                     </ItemTemplate>
                                </telerik:GridTemplateColumn>
                            </Columns>
                            <NestedViewTemplate>
                                <asp:Label ID="Label1" runat="server" Text='<%# Eval("Description") %>'></asp:Label>
                            </NestedViewTemplate>
                         </MasterTableView>
                     </telerik:RadGrid>

I'm able to iterate through the grid items and set the visibility of the nested template based on permission as so:
GridItem[] nestedViewItems = tableView.GetItems(GridItemType.NestedView);
            foreach (GridNestedViewItem nestedViewItem in nestedViewItems)
            {
                nestedViewItem.Visible = visible; //user has permission?
            }
I just have not figured out how to ALWAYS disable the expand/collapse column no matter what.  I've looked at the code you suggested but that is not working for my scenario.  I must be missing something.  Any help would be appreciated.

[Yavor]

Hello debbie,

Attached to this message, is a sample application, which handles the desired functionality.
I hope it helps.

All the best,
Yavor
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

[debbie f]

That's perfect.  I had found another suggestion for implementation during itemdatabound, but your solution requires less code.  Thanks so much.