TreeView NodeClick and AjaxPanel

[Neel]

I spent a few hours ripping my hair out over this one - but it appears that there is a bug in the NodeCheck event in RadTreeView. It may be specific to Firefox/Mozilla, and i've tried the no-cache fix, with no luck.

As an example, create a TreeView with checkboxes=true, and populate it with say 10 nodes in the Page_Load event. Add a NodeCheck server side event (the function can be empty).  Wrap the TreeView in an AjaxPanel, and run the project.

<telerik:RadAjaxPanel ID="rap2" runat="server">
<telerik:RadTreeView runat="server" ID="tv1" CheckBoxes="true"  onnodeexpand="tv1_NodeExpand" onnodecheck="tv1_NodeCheck"  >
</telerik:RadTreeView>
</telerik:RadAjaxPanel>

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        tv1.Nodes.Clear();
        for (int i = 0; i < 10; i++)
        {
            tv1.Nodes.Add(new RadTreeNode(i.ToString()));
        }
    }
}

Check off all the boxes, and hit refresh on the browser (CTRL-R or F5). When the page reloads, either none of the nodes will be checked, or only the first node will be checked. It appears that the ViewState is not being saved after a NodeCheck event.

The hack solution i have for the time being is to add in an OnClientNodeChecked handler with the following:

function ClientNodeCheck() {
    var tree = $find("<%= tv1.ClientID %>");
    tree.UpdateState()
}

Could you please confirm if this is in fact a bug, and if there will be a fix for this in an upcoming release?

Thanks,

N.

[Neel]

Quick update - it seems that my serverside OnClick event is no longer firing after adding in the ClientSide event - is this expected?

[Princy]

Hello Neel,

Check the following code library which explains how to persist checked state of CheckBox in RadTreeView.
Persist Checked State after PostBack.

Thanks,
Princy.