Question

I am allowing a user to check the checkboxes associated with nodes in my treeview.

I would like to prompt the user for their input as soon as a specific node is checked.
For Example:

if node#2 is checked then get user input

1. how do i do this? is the best way c# with javascript?
   if so , then how?

2. how would i get a list of selected notes after submit button is clicked?

Answer 1

//get a list of selected nodes after submit button is clicked
 protected void submitBtn_Click(object sender, EventArgs e)
 {
           if (this.tree.CheckedNodes.Count > 0)
            {
                // Iterate through the CheckedNodes collection and display the selected nodes.
                foreach (TreeNode node in tree.CheckedNodes)
                {
                   Response.Write(node.Value + "<br />"); 
                }
            }

            else
            {
                Response.Write("No node selected.");

            }
}

To get the selected node when user check a node you have to fire postback in javascript in head tag
Like

<script language="javascript" type="text/javascript">
        function postBackByObject() {
            var o = window.event.srcElement;
            if (o.tagName == "INPUT" && o.type == "checkbox") {
                __doPostBack("", "");
            }
        }

</script>

and put above code inside TreeNodeCheckChanged event of Treeview
like

protected void tree_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
{

        if (tree.CheckedNodes.Count > 0)
        {
            // Iterate through the CheckedNodes collection and display the selected nodes.
            foreach (TreeNode node in tree.CheckedNodes)
            {
                Response.Write (node.Value + "<br />");

            }
        }

        else
        {
            Response.Write("No items selected.");

        }

    }