The net implementation of the TreeView selects the parent node whose child nodes are also selected by selecting a neutron node whose parent node and root node are also chosen

1, in Page_Load (object sender, EventArgs e) added: TreeView1.Attributes.Add ("onclick", "Checkevent (event)");// TreeView1 is the name of the tree control.

JavaScript placed between

<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title></title>
<script type= "Text/javascript" >
function Checkevent (evt) {
EVT = Window.event | | Evt
var objnode = Evt.srcelement | | Evt.target;
if (Objnode.tagname = = "INPUT" && objnode.type = = "checkbox") {
var objparentdiv = objNode.id.replace ("checkbox", "Nodes");
if (objnode.checked = = True) {
Setchildcheckstate (Objparentdiv, true);

                     setparentcheckestate (Objnode, true);
               }
                else {
                     Setchildcheckstate (Objparentdiv, false);

if (! Hasotherchecked (Objnode)) {
Setparentcheckestate (Objnode, false);
}
}
}
}

Determine if there are other nodes in parallel that are selected
function hasotherchecked (objnode) {
var objparentdiv = Webform_getparentbytagname (Objnode, "div");

            var chks = Objparentdiv.getelementsbytagname ("INPUT");
            for (var i = 0; i < chks.length; i++) {
& nbsp;               if (chks[i].checked && chks[i].id! = objnode.id) {
                     return true;
               }
           }
            return false;
       }

       /Set parent node
        function Setparentcheckestate (Objnode, chkstate) {
            try {
                var Objparentdiv = Webform_getparentbytagname (Objnode, "div");

                if (Objparentdiv = = null | | Objparentdiv = = "undefined") {
                     return;
               }
                else {
                     var objparentchkid = objParentDiv.id.replace ("Nodes", "checkbox");
                     var objparentcheckbox = document.getElementById (objparentchkid);

                     if (objparentcheckbox) {
                         objparentcheckbox.checked = chkstate;
                         setparentcheckestate (Objparentdiv, chkstate);
                    }
               }
           }
            catch (e) {}
        }

       /Set child nodes
        function Setchildcheckstate (Nodeid, chkstate) {
            var node = document.getElementById (Nodeid);

if (node) {
var chks = node.getelementsbytagname ("INPUT");
for (var i = 0; i < chks.length; i++) {
chks[i].checked = chkstate;
}
}
}
</script>

2. Registering events in Page_Load

protected void Page_Load (object sender, EventArgs e) {
TREEVIEW1.ATTRIBUTES.ADD ("onclick", "Checkevent (event)");
}

The net implementation of the TreeView selects the parent node whose child nodes are also selected by selecting a neutron node whose parent node and root node are also chosen