Hi.
Is it possible to set the CheckState of a parent node independently of how the child nodes are set? In my code, it won't let me change the state if there are different states in child node.
Here's the code, just a simple form with a RadTreeView named "tree" on it:
Imports Telerik.WinControls
Imports Telerik.WinControls.UI
Public Class frmTest
Private Sub frmTest_Load(sender As Object, e As EventArgs) Handles Me.Load
Me.tree.CheckBoxes = True
Me.tree.AutoCheckChildNodes = False
Me.tree.TriStateMode = True
For i As Integer = 1 To 2
Dim node As New RadTreeNode("Parent " + i.ToString)
Me.tree.Nodes.Add(node)
For j As Integer = 1 To 3
node.Nodes.Add("Child " + j.ToString)
Next
Next
Me.tree.ExpandAll()
End Sub
Private Sub tree_NodeMouseClick(sender As Object, e As RadTreeViewMouseEventArgs) Handles tree.NodeMouseClick
e.Node.Current = True
Select Case e.Node.CheckState
Case Enumerations.ToggleState.On
e.Node.CheckState = Enumerations.ToggleState.Off
Case Enumerations.ToggleState.Off
e.Node.CheckState = Enumerations.ToggleState.Indeterminate
Case Enumerations.ToggleState.Indeterminate
'won't change the state on a parent node if not all child nodes are checked!
e.Node.CheckState = Enumerations.ToggleState.On
End Select
e.Node.Current = False
End Sub
Private Sub tree_NodeCheckedChanging(sender As Object, e As RadTreeViewCancelEventArgs) Handles tree.NodeCheckedChanging
If Not e.Node.Current Then
e.Cancel = True
End If
End Sub
End ClassI hope that makes sense..
1 Answer, 1 is accepted
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Hello, Jure,
Note that when you click the checkbox of a node element, it is expected RadTreeView internally to toggle the check state and make the affected node selected/current. When the AutoCheckChildNodes property is set to false, the child nodes are not expected to be affected by the parent node's ToggleState. Indeed, in this case, if you want to a parent node to be toggled (ToggleState.On), ToggleState.Indeterminate will be possible. This is because the TriStateMode property is enabled according to the provided code snippet.
The possible solution that I can suggest in this case is to turn off the AutoCheckChildNodes and the TriStateMode and handle all checks in the NodeCheckedChagned event. Hence, if you want to manage the child nodes in any particular way when the parent node is checked, you can do it in the NodeCheckedChagned event. RadTreeNode offers the Level property which indicates the hierarchy level of the node and thus you can determine whether the root node or a child node is affected.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Note that when you click the checkbox of a node element, it is expected RadTreeView internally to toggle the check state and make the affected node selected/current. When the AutoCheckChildNodes property is set to false, the child nodes are not expected to be affected by the parent node's ToggleState. Indeed, in this case, if you want to a parent node to be toggled (ToggleState.On), ToggleState.Indeterminate will be possible. This is because the TriStateMode property is enabled according to the provided code snippet.
The possible solution that I can suggest in this case is to turn off the AutoCheckChildNodes and the TriStateMode and handle all checks in the NodeCheckedChagned event. Hence, if you want to manage the child nodes in any particular way when the parent node is checked, you can do it in the NodeCheckedChagned event. RadTreeNode offers the Level property which indicates the hierarchy level of the node and thus you can determine whether the root node or a child node is affected.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik
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Jure
commented on 17 Sep 2021, 04:28 PM
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Thank you Dess! I only had to turn off the TriStateMode to get the result that I wanted. I ignore the checkbox of a node click by canceling in the NodeCheckedChanging event, if it wasn't before clicked on the node text (not here in the test form) … I leave the NodeCheckedChanged event for saving in the DB...