Function getScrollParent

packages/react-select/src/utils.ts:200–222

(element: HTMLElement)

// ------------------------------

export function getScrollParent(element: HTMLElement) {
  let style = getComputedStyle(element);
  const excludeStaticParent = style.position === 'absolute';
  const overflowRx = /(auto|scroll)/;

  if (style.position === 'fixed') return document.documentElement;

  for (
    let parent: HTMLElement | null = element;
    (parent = parent.parentElement);

  ) {
    style = getComputedStyle(parent);
    if (excludeStaticParent && style.position === 'static') {
      continue;
    }
    if (overflowRx.test(style.overflow + style.overflowY + style.overflowX)) {
      return parent;
    }
  }

  return document.documentElement;
}

// Animated Scroll To
// ------------------------------