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POHow can I clear the previous selection when an asp:TreeView is in an UpdatePanel?
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  1. POHow can I clear the previous selection when an asp:TreeView is in an UpdatePanel?
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    copied!<p>I have an ASP.Net 2.0 page that contains two UpdatePanels. The first panel contains a TreeView. The second panel contains a label and is triggered by a selection in the tree. When I select a node the label gets updated as expected and the <code>TreeNode</code> that I clicked on becomes highlighted and the previously selected node is no longer highlighted. However if a node is original highlighted(selected) in the code-behind the highlight is not removed when selecting another node.</p> <p>The markup</p> <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional"&gt; &lt;ContentTemplate&gt; &lt;asp:TreeView ID="TreeView1" runat="server" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged"&gt; &lt;SelectedNodeStyle BackColor="Pink" /&gt; &lt;/asp:TreeView&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; &lt;asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="True"&gt; &lt;ContentTemplate&gt; &lt;asp:Label ID="Label1" runat="server" Text=" - "&gt;&lt;/asp:Label&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="TreeView1" EventName="SelectedNodeChanged" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>The code behind</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { TreeView1.Nodes.Add(new TreeNode("Test 1", "Test One")); TreeView1.Nodes.Add(new TreeNode("Test 2", "Test Two")); TreeView1.Nodes.Add(new TreeNode("Test 3", "Test Three")); TreeView1.Nodes.Add(new TreeNode("Test 4", "Test Four")); TreeView1.Nodes[0].Selected = true; } } protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) { Label1.Text = TreeView1.SelectedValue; } </code></pre> <p>The at the start the first node is selected. Why is its highlight not removed when selecting another node?</p> <p>Also, I asked a different <a href="https://stackoverflow.com/questions/205114/why-is-my-asptreeview-selected-node-reset-when-in-an-updatepanel">question about the same setup</a> that I haven't got an answer for. Any help would appreciated. </p> <p><strong>Edit</strong> I know that setting <code>ChildrenAsTriggers="false"</code> will work but I want to avoid rendering the tree again as it can be very large.</p>
 

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