How can a div that scrolls horizontally change direction when scrolled and be simultaneously controlled by scrolling?

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To achieve this effect, you can use JavaScript to detect the user's scrolling direction and then apply that direction to the horizontal scroll position of the div element.

Here is an example code snippet:

// Select the scrolling div element
const scrollingDiv = document.getElementById('scrolling-div');

// Keep track of the current horizontal scroll position
let currentScrollPosition = 0;

// Listen for the scroll event on the document
document.addEventListener('scroll', () => {
  // Check the current scroll position to determine the scrolling direction
  const newScrollPosition = scrollingDiv.scrollLeft;
  const scrollDirection = newScrollPosition > currentScrollPosition ? 'right' : 'left';

  // Update the horizontal scroll position of the div element based on the scrolling direction
  scrollingDiv.scrollLeft = scrollDirection === 'right' ? newScrollPosition + 10 : newScrollPosition - 10;

  // Update the current horizontal scroll position to be used for the next scroll event
  currentScrollPosition = newScrollPosition;
});

This code listens for the scroll event on the document, calculates the scrolling direction based on the current and previous horizontal scroll positions, and then updates the scroll position of the div element according to the direction. The 10 value in the scrollLeft property can be adjusted to control the scroll speed.