What is the most efficient way to glue flask with an application?

Question

JavaScript

There is a python script which is passed a list of parameters - links.
The script processes each of them, and after - gives out the answer.
It is necessary to make two fields on flask - input and output (the result of each processed link is immediately written to this field), and two buttons - stop / start.
The stop button stops the process of processing links, and the start button starts it.
In fact, you need to somehow make it so that the creak can be paused / resumed at any time.
Thanks in advance for all helpful replies!

PS Preferably the whole web in one file

Answer 1

So you got it, before the scroll, you have it === 0. Do you
want to see it on every scroll?

var lastScrollTop = 0,
      scrollDirection = 0;
    $(window).scroll(function(event){
        var st = $(this).scrollTop();
        if (st > lastScrollTop){
                scrollDirection = 1;
        } else {
                scrollDirection = 2;
        }
        lastScrollTop = st;
    console.log(scrollDirection);

    });