Java script on treeview to select 1 node with directory listing

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C#

Javascript

I have a treeview in asp.net with dynamic content populated at run time , i want to select just one node for which i copied java script from online to do this which works, as i am new in c# and java script , but it has one issue that it works at page level i.e it also uncheck all other checkbox controls in that same page.

What i want is this java script to work at only this treeview item only instead of all control at page level, i tried by specifying treeview as tag name in JS function but didnt work , please help me in this regard as to what to change exactly

My treeview is defined like this in aspx page :

<asp:TreeView ID="tvwItems"

and this is called like below in c# code file at page render level event :

tvwItems.Attributes.Add("OnClick","client_OnTreeNodeChecked(event)");

The java script is as following :

What I have tried:

<script type="text/javascript">
    // select only one folder from treeview
    function client_OnTreeNodeChecked(event) {
        var treeNode = event.srcElement || event.target;
        if (treeNode.tagName == "INPUT" && treeNode.type == "checkbox") {
            if (treeNode.checked) {
                uncheckOthers(treeNode.id);
            }
        }
    }

    function uncheckOthers(id) {
        var elements = document.getElementsByTagName('input');
        // loop through all input elements in form -- issue here need to limit to that tree only , help required from expert ??
        for (var i = 0; i < elements.length; i++) {
            if (elements.item(i).type == "checkbox") {
                if (elements.item(i).id != id) {
                    elements.item(i).checked = false;
                }
            }
        }
    }
     </script>

Many thanks
Chandan