Answer 1

I dont think there is a direct way to prevent scrolling.

But you can prevent interaction events that would do the scrolling.

Here is an example to prevent scrolling by the 'wheelevent':
window.addEventListener(wheelEvent, preventDefault, wheelOpt);

When you want to enable scrolling again you can remove the EventListener:
window.removeEventListener(wheelEvent, preventDefault, wheelOpt);

I hope that helps.