Prevent Navbar from allowing entire page to be scrolled?

My Cordova app doesn’t utilise vertical scrolling, and dragging up/down on the page will not result in scroll movement. I also have Cordova’s config.xml set to disallow the webview’s bounce effect.

But a bug I currently have is if the user drags from within the Navbar only: It will allow the entire page to scroll up/down (but keeping the Navbar in the usual static spot).

How can I prevent drag movements from passing through the Navbar?