TreeView Control Problem
- by ProgNet
Hi all,
I have a public folder on the server that contains recursively nested sub folders.
In the various Leaf folders contains Images.
I wanted to create a server side file browser that will display the Images to the user.
I am using the ASP.NET TreeView Control.
I create the tree nodes using PopulateOnDemand.
If the user click on a leaf directory I want the images in that folder to be displayed in a DataList Control.
The problem is that when I click on a sub tree node (after I expanded it parent node)
All the expanded sub tree disappears and only the parent node is showed with no + sign next to it !!
( I have set the TreeView's PopulateNodesFromClient property to true )
Can someone tell me what is the problem ??
Thanks
Here is the code :
<asp:TreeView ID="TreeView1" runat="server" AutoGenerateDataBindings="False"
onselectednodechanged="TreeView1_SelectedNodeChanged"
ontreenodepopulate="TreeView1_TreeNodePopulate">
</asp:TreeView>
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string path = Server.MapPath(".");
PopulateTopNodes(path);
}
}
private void PopulateTopNodes(string pathToRootFolder)
{
DirectoryInfo dirInfo = new DirectoryInfo(pathToRootFolder);
DirectoryInfo[] dirs = dirInfo.GetDirectories();
foreach (DirectoryInfo dir in dirs)
{
TreeNode folderNode = new TreeNode(dir.Name,dir.FullName);
if (dir.GetDirectories().Length > 0)
{
folderNode.PopulateOnDemand = true;
folderNode.Collapse();
}
TreeView1.Nodes.Add(folderNode);
}
}
protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
{
if (IsCallback == true)
{
if (e.Node.ChildNodes.Count == 0)
{
LoadChildNode(e.Node);
}
}
}
private void LoadChildNode(TreeNode treeNode)
{
DirectoryInfo dirInfo = new DirectoryInfo(treeNode.Value);
DirectoryInfo[] dirs = dirInfo.GetDirectories();
foreach (DirectoryInfo dir in dirs)
{
TreeNode folderNode = new TreeNode(dir.Name, dir.FullName);
if(dir.GetDirectories().Length>0){
folderNode.PopulateOnDemand = true;
folderNode.Collapse();
}
treeNode.ChildNodes.Add(folderNode);
}
}
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
// Retrieve the images here
}
