# OnClientNavigationCommand

The **OnClientNavigationCommand** occurs when  the user changes the selected view of the Gantt.

The event handler receives two parameters:

1. The instance of the **Gantt** control firing the event.

2. An **eventArgs** parameter containing the following methods:

   * **set_cancel** lets you cancel the event and prevent the view switching.

   * **get_view** returns the name of the selected view.

```ASP.NET
<telerik:RadGantt RenderMode="Lightweight" runat="server" id="RadGantt1" OnClientNavigationCommand="OnClientNavigationCommand">
</telerik:RadGantt>
```

```JavaScript
function OnClientNavigationCommand(sender, eventArgs) {
    args.set_cancel(true);
}
```

## See Also

* [Client-Side Basics](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/client-side-programming/overview)

* [Client-Side Events](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/client-side-programming/events/overview)