Remove expand/collapse icon on selected folders

[Graham Berry]

Hi,

I have a requirement to have a node with child nodes but for the child nodes not to be made visible to the user. It is really to keep the whole structure in the same place. I thought by making all child nodes and/or leaves visible=false this would mean that the parent node would not have an expand/collapse icon but this was not the case.

For example:

    Root
        Node A
            Section 1 (visible=false)
                Part 1 (visible=false)
                Part 2 (visible=false)
            Section 2 (visible=false)
                Part 1 (visible=false)
                Part 2 (visible=false)
                Part 3 (visible=false)
                Part 4 (visible=false)

I was expecting that "Node A" would not have expand/collapse as nothing was visible below it.

I found another forum entry that seemed to cover this but the attribute is no longer available;

"Disable expand icon and labeledit" - Jun 27, 2007

RadTreeNode node = this.radTreeView1.Nodes[0].Nodes["Search Folders"];

node.StateImageIndex = -1;

Thanks,
Graham

[Victor]

Hi Graham Berry,

Thank you for writing.

I am afraid that RadTreeView's logic responsible for the expand/collapse images is not configurable. You will have to devise a mechanism which will add and remove child nodes dynamically. You can remove the expand/collapse images via RadTreeViewElement's ExpandImage, CollapseImage, HoveredExpandImage and HoveredCollapseImage properties but the expand collapse part will still be clickable.

Write again if you need further assistance. If you choose to remove the images you can use the NodeExpandedChanging event and cancel it when appropriate.

Write again if you need further assistance.
 
Sincerely yours,
Victor
the Telerik team

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[Kenneth]

Is there any chance that you will support to remove the expand-icon/behaviour for certain nodes that are loaded on demand?

[erwin]

Kenneth,

you can show/hide the expand indicator in the NodeFormatting Event handler.

In my demand-loading tree I use a helper object (TreeNodeInfo) in the .Tag Attribute and when loading the parent nodes, I already query the database for the number of potential child nodes.

private void myRadTreeView_NodeFormatting(object sender, TreeNodeFormattingEventArgs e)
    {
        TreeNodeInfo info = e.Node.Tag as TreeNodeInfo;

        if (info != null)
        {
            if (info.PotentialChildNodes > 0)
            {
                e.NodeElement.ExpanderElement.Visibility = ElementVisibility.Visible;
            }
            else
            {
                e.NodeElement.ExpanderElement.Visibility = ElementVisibility.Hidden;
            }
        }
    }

Regards
Erwin

[Kenneth]

Thanks for the solution!
(a little bit late reply ;) )