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Select a Treenode from clientside or serverside

Posted on 2009-06-29
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Last Modified: 2012-05-07
Hi All,
Can i set TreeView1.SelectedValue dynamically in serverside or clientside.This is my treeview
<asp:TreeView ID="TreeView1" runat="server" onselectednodechanged="TreeView1_SelectedNodeChanged">
<nodes>
<asp:TreeNode Value="1" Text="Parent1">
<asp:TreeNode Value="11" Text="child11"/>
<asp:TreeNode Value="12" Text="child12"/>
</asp:TreeNode>
<asp:TreeNode Value="2" Text="Parent2"></asp:TreeNode>
<asp:TreeNode Value="3" Text="Parent3"></asp:TreeNode>
</nodes>
</asp:TreeView>

I want to set TreeView1.SelectedValue="11" on pageload .How can i do this?Any Suggestions.
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Question by:sastry_sagi
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Expert Comment

by:ddayx10
ID: 24742574
Dude this is so messsed up it makes me wanna throw a tantrem.

Anyway the property for selectednode is readonly (which is crazy) as you probably already figured out. So the only way to set the node is to loop through the treeview.nodes, check their value and if it is the value you want then set it as selected using the node.selected property.

This will only work if you have 1 level of treenodes though. If you try this on a treeview with say 3 levels of nodes you will not have success. I put together a small sample using your treeview that does a recursive check through all node levels, finds the one you want and selects it....enjoy!

PS: I didnt know if you wanted C# or VB so you got what I was working with at the time (vb)
****YOUR ASPX CODE, WITH SELECTED NODE STYLE ADDED SO WE CAN SEE WHAT HAPPENS ****
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
	<asp:TreeView ID="TreeView1" runat="server" ForeColor="Red" SelectedNodeStyle-BackColor="Green">
		<Nodes>
			<asp:TreeNode Value="1" Text="Parent1">
				<asp:TreeNode Value="11" Text="child11" />
				<asp:TreeNode Value="12" Text="child12" />
			</asp:TreeNode>
			<asp:TreeNode Value="2" Text="Parent2"></asp:TreeNode>
			<asp:TreeNode Value="3" Text="Parent3"></asp:TreeNode>
		</Nodes>
	</asp:TreeView>
	</form>
</body>
</html>
 
 
****CODE BEHIND****
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        recursiveNodeCheck(TreeView1.Nodes, "3")
    End Sub
 
    Public Sub recursiveNodeCheck(ByVal nod As TreeNodeCollection, ByVal sValue As String)
        For Each tn As TreeNode In nod
            If tn.Value = sValue Then
                tn.Selected = True
            Else
                recursiveNodeCheck(tn.ChildNodes, sValue)
            End If
        Next
    End Sub

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ddayx10 earned 500 total points
ID: 24742585
PSS: Make sure you dont do this before you have bound your control. In your sample it was manually built so it doesnt matter, but if you add/remove to the treeview using code behind then you cant check/set the selectedvalue until after you finish manipulating it.
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