Hi,

I use WebDataTree and I am doing manual load on demand by populating the nodes on NodePopulate event.

I have seen that the event will be fired only once per node.

For example, if I load 3 levels of tree data initially and expand them all, when I expand a node in the third level, the NodePopulate  event is fired for it. After this, if I collapse the root level node and expand it again, it fires NodePopulate event even for root level node. Hence I manually load the root's children and similarly it's children. Now in the third level, if I again try to expand the same node which I did earlier, NodePopulate event is not fired for it.

Can anyone tell me if I need to do anything in specific to fix this.

Here is my Tree definition:

<ig:WebDataTree ID="Tree" runat="server" InitialExpandDepth="0" EnableExpandOnClick="false" StyleSetName="Office2010Blue"

        InitialDataBindDepth="0" EnableAjax="true" EnableConnectorLines="false"  Font-Size="Small" OnNodeDropped="serverNodeDropped">       

        <AutoPostBackFlags NodeDropped="On" />

        <ClientEvents NodeClick="Tree_NodeClick" />

    </ig:WebDataTree>

Code behind:

 protected void treeNodePopulate(object sender, DataTreeNodeEventArgs e)

    {

        this.Tree.DataBind();

        if (!e.Node.HasChildren)

        {

            //Logic to load list of employees under e.Node

            foreach (Employee emp in childNodes)

            {

                DataTreeNode treeNode = new DataTreeNode();

                treeNode.Text = emp.NodeDescription;

                treeNode.Key = emp.NodeID;

                treeNode.NavigateUrl = emp.NodeURL;

                treeNode.ImageToolTip = emp.LevelDepth.ToString();

                treeNode.IsEmptyParent = true;

                treeNode.ImageUrl = emp.ImageURL;

                treeNode.Value = emp.NodeVal;

                e.Node.Nodes.Add(treeNode);

            }

        }

    }

    protected override void OnInit(EventArgs e)

    {

        base.OnInit(e);

        this.Tree.NodeBound += new DataTreeNodeEventHandler(treeNodeBound);

        this.Tree.NodePopulate += new DataTreeNodeEventHandler(treeNodePopulate);

     }

    protected void Page_Load(object sender, EventArgs e)

    {

        this.Tree.NodeBound += new DataTreeNodeEventHandler(treeNodeBound);

        this.Tree.NodePopulate += new DataTreeNodeEventHandler(treeNodePopulate);

        if (!Page.IsPostBack)

        {

            // Logic to load the Employee data corresponding to first 3 levels and populate the tree

        }

    }