Hiding expand/collapse images when no records with NeedDataSource

[Suzy]

I have a telerik datagrid and I would like to hide the collapse button when there are no childs available. It does not work as I would aspect.
This is my code :

<telerik:RadGrid ID="grdTest" runat="server" AutoGenerateColumns="false" PageSize="20" AllowSorting="true" AllowPaging="true" ShowGroupPanel="true" ShowFooter="true"

 MasterTableView-HierarchyDefaultExpanded="true"

 OnNeedDataSource="grdTest_NeedDataSource" OnItemCreated="grdTest_ItemCreated" OnPreRender="grdTest_PreRender" >

 

 <MasterTableView AllowSorting="true" DataKeyNames="TicketID, TopTicketID" Width="100%" HierarchyLoadMode="ServerBind">

 <SelfHierarchySettings ParentKeyName="TopTicketID" KeyName="TicketID" />

 <Columns>

 <telerik:GridBoundColumn SortExpression="TicketID" HeaderText="Ticket" HeaderButtonType="TextButton" DataField="TicketID" UniqueName="TicketID"></telerik:GridBoundColumn>

  </Columns>

 </MasterTableView>

 <ClientSettings AllowExpandCollapse="true"></ClientSettings>

 </telerik:RadGrid>


my C# code behind :

protected void grdTest_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
         {
            grdTest.DataSource = BLogic.ITTickets.GetStructure(null, null, 0);
         }

  protected void grdTest_PreRender(object sender, EventArgs e)
        {
            HideExpandColumnRecursive(grdTest.MasterTableView);
        }
        public void HideExpandColumnRecursive(GridTableView tableView)
        {
            GridItem[] nestedViewItems = tableView.GetItems(GridItemType.NestedView);
            foreach (GridNestedViewItem nestedViewItem in nestedViewItems)
            {
                foreach (GridTableView nestedView in nestedViewItem.NestedTableViews)
                {
                    if (nestedView.Items.Count == 0)
                    {
                        TableCell cell = nestedView.ParentItem["ExpandColumn"];
                        cell.Controls[0].Visible = false;
                        cell.Text = " ";
                        nestedViewItem.Visible = false;
                    }
                    if (nestedView.HasDetailTables)
                    {
                        HideExpandColumnRecursive(nestedView);
                    }
                }
            }
        }

The BLogic.ITTickets.GetStructure(null, null, 0);  calls a stored procedure on sql server that gives me back the list with the data.

Can anyone please tell me what I do wrong?

Kind regards

Suzy

[Konstantin Dikov]

Hi Suzy,

In order to hide the expand/collapse images when there are no records in self-referencing hierarchy you should follow the approach demonstrated in the following help article instead:

• Hiding the expand/collapse images when no records in self-referencing hierarchy

*The self-referencing hierarchy is no longer recommended and the above article is not available anymore

Please follow all the instructions from the help article and see if everything will work as expected on your end too.


Best Regards,
Konstantin Dikov
Telerik

 

 

[Suzy]

I tried this and it works almost correct. 
All the bellow levels are shown open.  When I close for example the first one, everything is ok, but when I close another when, the >-sign of the the first one is gone....

​

[Suzy]

Hi Konstantin,

I already followed the steps in the help article you mentioned before I posted this on the forum.  Did not fix my problem.

I fixed it by setting the HierarchyLoadMode to ServerBind not ServerOnDemand

Kind regards

Suzy

[Sam]

Link is dead!!! Frustrating!!

[Konstantin Dikov]

Hello Sam,

The linked help article is no longer available, because self-referencing data structure we have RadTreeList controls:

• http://demos.telerik.com/aspnet-ajax/treelist/examples/overview/defaultcs.aspx

As for removing the expand/collapse icons you could refer to the following help article instead:

• http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/how-to/hierarchy/hiding-the-expand-collapse-images-when-no-records

Hope this helps.


Regards,
Konstantin Dikov
Telerik