Collapse nested table rows using HideExpandColumnRecursive method

[Aaron Jessen]

The following code (called from RadGrid_PreRender) will iterate through a radgrid (and 3 nested tables) and hide the expand button if the row has no child records. I pieced this together from samples on this forum.

1) The MasterTableView is first populated by a call to NeedDataSource
2) The rows for the related nested tables are called by the DetailTableDataBind method
3) HierarchyLoadMode="ServerOnDemand" for all 4 tables ("Client" is not acceptable due to number of records)

 

 

 

Now, the last 3 lines of code (below, currently commented out) will collapse the MasterTableView nicely. However, upon expanding a row from that MasterTableView, the nested tables within are all expanded - not collapsed - as I need them to be. 

I have exhausted so many possibilities, so I finally posted this here. Note: This is not a question of how to hide the expand column (as is discussed in previous posts). Rather, it is a matter of making already collapsed tables STAY collapsed when the MasterTableView is expanded.

I suspect the problem lies within the DetailTableDataBind being called by ServerOnDemand after the MasterTableView row is clicked (thusly, repopulating the tables and overwriting any hiding/collapsing that has already been perfomed). Basically, I really need to know how to call "HideExpandColumnRecursive" on NESTED detail tables after they are created (which happens after a MasterTableView has been expanded). Complicated, I know. Any help would be greatly appreciated.

 

Protected

 

Sub RadGrid1_PreRender(ByVal sender As Object, ByVal e As EventArgs)

 

 

If Not IsPostBack Then

 

 

 

HideExpandColumnRecursive(RadGrid1.MasterTableView)

 

 

End If

 

 

End Sub

 

 

 

Public

 

Sub HideExpandColumnRecursive(ByVal tableView As GridTableView)

 

 

Dim nestedViewItems As GridItem() = tableView.GetItems(GridItemType.NestedView)

 

 

For Each nestedViewItem As GridNestedViewItem In nestedViewItems

 

 

For Each nestedView As GridTableView In nestedViewItem.NestedTableViews

 

 

If nestedView.Items.Count = 0 Then

 

 

Dim cell As TableCell = nestedView.ParentItem("ExpandColumn")

 

 

Dim expandCollapseButton As Button = CType(cell.Controls(0), Button)

 

expandCollapseButton.Visible =

False

 

nestedViewItem.Visible =

False

 

 

End If

 

 

If nestedView.HasDetailTables Then

 

HideExpandColumnRecursive(nestedView)

 

End If

 

 

Next

 

 

Next

 

 

'For Each item As GridDataItem In RadGrid1.MasterTableView.Items

 

 

' item.Expanded = False

 

 

'Next

 

 

End Sub

 

[Mira]

Hi Aaron,

What I understood from your post and the support ticket is that you want to achieve look of the grid like this one. So I suggest that you follow closely the demo and read these articles:
Traversing detail tables/items in Telerik RadGrid
Single expand in hierarchical grid
Hiding expand/collapse images when no records

I hope this gets you started properly.

Kind regards,
Mira
the Telerik team

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