How to check whether the current node is expanded

[Manoj]

Hi Princy,
    I have implemented the On Demand Loading . There is a provision in my tree view control user can right click and select the option "Add a New Node" context menu item and can add a new items . But I want some thing like if the current node on which the mouse curse is not expanded( That means it is displaying the '+' symbol ) I have to inform the user to expand the node or I have to expand the node when user right clicks on the node . Can you please suggest me how can I able to know whether the current node is expanded or not ?

With Regards
Manoj

[Princy]

Hi Manoj,

Try the following code snippets for alerting user if node is not expanded and currently on right clicking the node. Attach the ClientContextMenuShowing() handler to OnClientContextMenuShowing event of RadTreeView.

JavaScript:

<script type="text/javascript">
function ClientContextMenuShowing(sender, eventArgs)
{
     var node = eventArgs.get_node();
     if(node.get_expanded()==false)
     {
        alert("Node is not expanded, First expand the node");
     }
}
</script>

Thanks,
Princy.

[Manoj]

Hi Princy,
            Thanks for your reply . I tried to use your suggested code but now the default window context menu is coming up . Can you suggest me how can I avoid this .

function

onClientContextMenuShowing(sender, args)

 

{

 

 

var treeNode = args.get_node();

 

 

 

if(treeNode.get_expanded()==false)

 

{

alert(

 

"Node is not expanded, First expand the node");

 

args.set_cancel(

 

true);

 

}

 

 

else

 

 

{

treeNode.set_selected(

true);

 

setMenuItemsState(args.get_menu().get_items(), treeNode);

}

}

Regards
Manoj

 

[Princy]

Hi Manoj,

I tried to following code for cancelling the mouse click event. Try the JavaScript code.

JavaScript:

<script type="text/javascript">
function OnClientContextMenuShowing(sender, eventArgs)
{
     var node = eventArgs.get_node();
     if(node._hasChildren()) //checking whether the node having children
     {
         if(node.get_expanded()==false)
         {
            alert("Node is not expanded, First expand the node");
            eventArgs.set_cancel(true);
            try
            {
                var e = window.event;
                if(!e) e = window.Event;
                if(e)
                {
                    e.returnValue = false;
                    e.cancelBubble = true;
                    e.stopPropagation();
                }
            } catch(c) {}
            return false;
        }
    }
    else
    {
        node.set_selected(true);
      //  setMenuItemsState(eventArgs.get_menu().get_items(), node);
    }
}
</script>

Thanks,
Princy.

[Manoj]

Hi Princy,
    Its work fine . Thanks .

Regards
Manoj

[Manoj]

Hi Princy,
    As I have implemented the Load On Demand , so I am expanding the leaf level node as client side . But when I am clicking the leaf level node I am getting the same message . It is working fine for the nodes which were not expanded ( having '+' symbol ) but not working for the leaf level node . Can you suggest me what should I do for this .

Regards
Manoj