ASP.NET TreeView and Selecting the Selected Node

Question

How do I capture the event of the clicking the Selected Node of a TreeView? It doesn\'t fire the SelectedNodeChanged since the selection has obviously not c

Answer 1

c#:

TreeNode node = TreeTypes.FindNode(obj.CustomerTypeId.ToString());


TreeTypes.Nodes[TreeTypes.Nodes.IndexOf(node)].Select();

Answer 2

Store what is selected and use code in the Page_Load event handler to compare what is selected to what you have stored. Page_Load is called for every post back even if the selected value doesn't change, unlike SelectedNodeChanged.

Example

alt text http://smithmier.com/TreeViewExample.png

html

<form id="form1" runat="server">
<div>
    <asp:TreeView ID="TreeView1" runat="server" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged"
        ShowLines="True">
        <Nodes>
            <asp:TreeNode Text="Root" Value="Root">
                <asp:TreeNode Text="RootSub1" Value="RootSub1"></asp:TreeNode>
                <asp:TreeNode Text="RootSub2" Value="RootSub2"></asp:TreeNode>
            </asp:TreeNode>
            <asp:TreeNode Text="Root2" Value="Root2">
                <asp:TreeNode Text="Root2Sub1" Value="Root2Sub1">
                    <asp:TreeNode Text="Root2Sub1Sub1" Value="Root2Sub1Sub1"></asp:TreeNode>
                </asp:TreeNode>
                <asp:TreeNode Text="Root2Sub2" Value="Root2Sub2"></asp:TreeNode>
            </asp:TreeNode>
        </Nodes>
    </asp:TreeView>
    <asp:Label ID="Label1" runat="server" Text="Selected"></asp:Label>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label></div>
</form>

C#

protected void Page_Load(object sender, EventArgs e)
{
    if(TreeView1.SelectedNode!=null && this.TextBox1.Text == TreeView1.SelectedNode.Value.ToString())
    {
        Label2.Text = (int.Parse(Label2.Text) + 1).ToString();
    }
    else
    {
        Label2.Text = "0";
    }
}
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
    this.TextBox1.Text = TreeView1.SelectedNode.Value.ToString();
}

Answer 3

protected void Page_Load(object sender, EventArgs e) 
    {
        if (!IsPostBack)
        {
            TreeView1.SelectedNode.Selected = false;
        }
    }

works for me