How to add a child node to a specific node in treeview? Say I have "Item1" in treeview already, how do I add "SubItem1" to "Item1" as it's child node?
I know its probably really simple, but i tried lots of stuff, i just cant get it working.
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4 Answers
Adding child node to parent (non-selected)
First use Find() to get a reference to the parent node. Then add it using the same technique as the other sections below.
Dim MyNode() As TreeNode
MyNode = TreeView1.Nodes.Find("Item1", True)
MyNode(0).Nodes.Add("SubItem1")
Adding nodes programmatically
If you want to add the child nodes to a particluar parent node, the idea is to add the child nodes to their parent node by using the parent.node.add() method.
You can create any number of child like this.
For example if you want to have a scenario like:
Grandfather-> Father-> Son
Then you could do this:
dim GrandfatherNOde as treenode = tree.nodes.add("Grandfather")
dim fatherNode as treenode = GrandfatherNode.Nodes.add("Father")
dim sonNode as treenode = fatherNode.Nodes.add("Son")
More reading/examples
This page has a good example you can run to dynamically add child nodes to the tree. They do it on a button, which they've hooked up like this:
Private Sub AddChild_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddChild.Click
TView.SelectedNode.Nodes.Add(Text1.Text)
End Sub
http://www.codeproject.com/Articles/11830/The-Basic-Operations-on-using-the-TreeView-Control
4 Comments
NetInfo
Thanks for your quick reply, but this doesn't seem to be working.
msigman
I've included a more complete example. Let me know if it works for you. If not, we'll figure out what the problem is from there.
NetInfo
Thanks a bunch for all these examples, but again the "Grandfather" is already added. what i want to do is add the "Father" to the "Grandfather" without selecting it. I already know how to add all three at the same time. Sorry for sounding like a noob. thanks again.
msigman
No problem, I understand what you're saying. Let me update my post to be more clear.
If you make sure that you assign a Name to your TreeNode You can use Find to locate it and add the Child node.
Example:
Public Class Form1
Dim Nodes(5) As TreeNode
Public Sub New()
' This call is required by the designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
Nodes(0) = New TreeNode("Root")
Nodes(0).Name = "Root"
Nodes(1) = New TreeNode("Item1")
Nodes(1).Name = "Item1"
Nodes(2) = New TreeNode("Item2")
Nodes(2).Name = "Item2"
Nodes(3) = New TreeNode("Item3")
Nodes(3).Name = "Item3"
Nodes(4) = New TreeNode("Item4")
Nodes(4).Name = "Item4"
Nodes(0).Nodes.Add(Nodes(1))
Nodes(0).Nodes.Add(Nodes(2))
Nodes(0).Nodes.Add(Nodes(3))
Nodes(0).Nodes.Add(Nodes(4))
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
TreeView1.Nodes.Add(Nodes(0))
End Sub
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
Dim tmpNode() As TreeNode = TreeView1.Nodes.Find("Item1", True)
'Assuming only one Match
tmpNode(0).Nodes.Add("Child Of Item1")
End Sub
End Class
Comments
I was looking for the same thing when i got here, and so far i couldnt get to what i needed.
So i got to this page: http://www.dotnetspider.com/forum/168335-How-add-node-treeview-VB.NET.aspx
Really cool and simple to do after you give it a look.
It turn out that we only need to keep typing nodes.add("nodename") to keep adding sublevels. Treeview1.Nodes.Add("Root_1").Nodes.Add("Child_Level_1").Nodes.Add("Child_Level_2")
Treeview1.Nodes.Add("Root_1").Nodes.Add("Child_Level_1").Nodes.Add("Child_Level_2")
This would get something like:
http://img716.imageshack.us/img716/7254/semttulonzk.jpg
Hope it Helped ;D.
Comments
*Assumes empty TreeView:
Dim rootNode = TreeView1.Nodes.Add("Root")
rootNode.Nodes.Add("SubNode")
