asked on

Treeview PopulateOnDemand fails

Hi

Can someone tell me why I cannot get this to work. The populate on demand function does not trigger

Here is the aspx code

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TreeView ID="TreeView1" runat="server" ImageSet="Arrows">
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" />
<SelectedNodeStyle Font-Underline="True" ForeColor="#5555DD" HorizontalPadding="0px"
VerticalPadding="0px" />
<Nodes>
<asp:TreeNode Text="Available devices" Value="0" PopulateOnDemand="True"></asp:TreeNode>
</Nodes>
<NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px"
NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>

</div>
</form>
</body>
</html>

Here is the Code behind.

Partial Class _Default
Inherits System.Web.UI.Page

Protected Sub TreeView1_TreeNodePopulate(ByVal sender As Object, ByVal e As TreeNodeEventArgs)
Select Case e.Node.Depth
Case 0
Response.Write(e.Node)
Exit Sub
Case 1
Response.Write(e.Node)
Exit Sub
End Select
End Sub

any help would be appreciated. Thanks

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nsfranklin

ASKER

Hi

Thanks for that, new code is
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" action="Default.aspx" runat="server">

<div>
<asp:TreeView ID="TreeView1" SkinId="Simple" Width="250" ExpandDepth="0" runat="server" AutoGenerateDataBindings="False">
<Nodes>
<asp:TreeNode Text="Inventory" SelectAction="SelectExpand" PopulateOnDemand="True" Value="Inventory"/>
</asp:TreeNode>
</Nodes>
</asp:TreeView>

</div>
</form>
</body>
</html>

Code behind is

Protected Sub TreeView1_TreeNodePopulate(ByVal sender As Object, ByVal e As TreeNodeEventArgs) Handles TreeView1.TreeNodePopulate
Select Case e.Node.Depth
Case 0
Response.Write(e.Node.ToString)
Exit Sub
Case 1
Response.Write(e.Node.ToString)
Exit Sub
End Select
End Sub

Why can I only click on the node once to trigger the treenodepopulate, the page re-displays with the + missing and subsequent clicks to not show a response.

nsfranklin

ASKER

Hi

Further to the above, my error, problem solved and points awarded for guidance.

Thanks