Extra information with expand()

[FU]

Is it possible, from Javascript, to pass an extra parameter along with the expand()-function to the serverside OnNodeExpand-method?

I'm building a tree using TreeNodeExpandMode.ServerSideCallBack and trying to implement an 'Expand all'-function in the contextmenu. I want to add the branch on the serverside instead of multiple calls to expand(). This all works well, except I can't differentiate the 'default' OnNodeExpand-event from the 'expand all'-event. I've tried using a textfield but as it's an Ajax-request it is not transferred to the server. I've also tried setting a custom attribute on the RadTreeNode but, again, it seems this isn't transferred. Any ideas?
 
I'm using the expand()-function because I'd like to preserve the loading-animation.

 

[Yana]

Hello Mickey13,

The approach with custom attributes should work, please subscribe to OnClientNodePopulating event of the treeview and in its handler:

<script type="text/javascript">
       function nodePopulating(sender, args) {
           var node = args.get_node();
           sender.trackChanges();
           node.get_attributes().setAttribute("attr", "value");
           sender.commitChanges();
       }
</script>

and then you can get the attribute in OnNodeExpand event like this:

protected void treeView1_NodeExpand(object sender, RadTreeNodeEventArgs e)
{
    var attrValue = e.Node.Attributes["attr"];
}

Greetings,
Yana
the Telerik team

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[FU]

That worked. trackChanges/commitChanges made the difference.