Method getScrollElement

src/utils.ts:573–581

@internal returns the passed element if vertically scrollable, else the closest parent that will, up to the entire document scrolling element

(el?: HTMLElement)

  /** @internal returns the passed element if vertically scrollable, else the closest parent that will, up to the entire document scrolling element */
  static getScrollElement(el?: HTMLElement): HTMLElement {
    if (!el) return document.scrollingElement as HTMLElement || document.documentElement; // IE support
    const overflowY = getComputedStyle(el).overflowY;
    if ((overflowY === 'auto' || overflowY === 'scroll') && el.scrollHeight > el.clientHeight) {
      return el;
    } else {
      return Utils.getScrollElement(el.parentElement);
    }
  }

  /**
   * @internal Function used to scroll the page.