RadTreeview SelectedNodeChange how to know if Unselect or Select is happening.

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Roger
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Roger asked on 17 Feb 2022, 04:23 PM

I know that when you select a node this event is called.

If you select another node, it is called TWICE.

 

Is there a way to know which it is calling it for (Unselecting or Selecting).

This way I can skip code on the unselecting one and only do code on the newly selected node.

Thanks,

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Dinko
Telerik team
answered on 18 Feb 2022, 01:02 PM

Hello Roger,

By design, when multiple selections are allowed and you click a new node, the selection is supposed to be cleared. That is why the SelectedNodeChanged event is fired for the previously selected node first and then it is fired for the new node. In the RadTreeViewEventArgs you can distinguish the two event firings by the Action which is set to Unknown when the selection is cleared.

private void radTreeView1_SelectedNodeChanged(object sender, Telerik.WinControls.UI.RadTreeViewEventArgs e)
{
    if (e.Action != Telerik.WinControls.UI.RadTreeViewAction.ByMouse)
    {
        Console.WriteLine(e.Node.Text);
    }
}

Another approach will be to check the Selected property of the node. If it is true, execute your logic.

private void RadTreeView1_SelectedNodeChanged(object sender, RadTreeViewEventArgs e)
{
    if (e.Node.Selected == true)
    {
        Console.WriteLine(e.Node.Text);
    }
}

I hope this information is helpful.

Regards,
Dinko
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Roger
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commented on 18 Feb 2022, 01:41 PM

Thanks for this response it worked as you stated.

 

Is there a place in the documentation where this is shown? 

 

Thanks,

 

 

 

Dinko
Telerik team
commented on 22 Feb 2022, 02:40 PM

Thank you for the provided feedback. I have double-checked and this is not mentioned in the documentation. Therefore I have logged an internal item in our backlog to update the RadTreeView documentation. We appreciate any feedback from our customers. I have updated your Telerik Points for bringing this to our attention.
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