# OnClientNodeEditing

The **OnClientNodeEditing** client-side event is called when editing is completed and before the **OnClientNodeEdit** event fires. This event can be canceled.

The event handler receives parameters:

1. The **TreeView** instance that fired the event.

2. Event arguments with functions:

* **get_node()** retrieves a reference to the node being edited. You can call get_text() from this node reference to get the "old" text prior to editing.

* **get_newText()** returns the new text entered by the user.

* **get_domEvent()** retrieves a DOM event object of the node edit.

* **set_cancel()** - call this function to specify whether the event should be canceled (true) or not (false).

The example below demonstrates preventing non-numeric entry to a node.

```ASPNET
<telerik:RadTreeView RenderMode="Lightweight" ID="RadTreeView1" 
    runat="server" 
    AllowNodeEditing="True" 
    OnClientNodeEditing="ClientNodeEditing">
</telerik:RadTreeView>
	    
```

```JavaScript
function ClientNodeEditing(sender, eventArgs) {
    var node = eventArgs.get_node();
    var oldText = node.get_text();
    var newText = eventArgs.get_newText()

    if (!IsNumeric(newText)) {
        alert("New entry must be numeric.");
        eventArgs.set_cancel(true);
    }
}

function IsNumeric(text) {
    var ValidChars = "0123456789.";
    var IsNumber = true;
    var Char;
    for (i = 0; i < text.length && IsNumber == true; i++) {
        Char = text.charAt(i);
        if (ValidChars.indexOf(Char) == -1) {
            IsNumber = false;
        }
    }
    return IsNumber;
}
```

## See Also

* [RadTreeNode](https://www.telerik.com/products/aspnet-ajax/documentation/controls/treeview/client-side-programming/objects/radtreenode)

* [OnClientNodeEditStart](https://www.telerik.com/products/aspnet-ajax/documentation/controls/treeview/client-side-programming/events/onclientnodeeditstart)

* [OnClientNodeEdited](https://www.telerik.com/products/aspnet-ajax/documentation/controls/treeview/client-side-programming/events/onclientnodeedited)