nextui/apps/docs/components/virtual-anchor.tsx

import React, {useEffect, useRef, useState} from "react";
import {Link} from "@nextui-org/react";

import {HashLinearIcon} from "@/components/icons";

export interface Props {
  id?: string;
  children?: React.ReactNode;
}

export const virtualAnchorEncode = (text?: string) => {
  if (!text) return undefined;

  return text.toLowerCase().replace(/ /g, "-");
};

export const VirtualAnchor: React.FC<Props> = ({children, id}) => {
  const ref = useRef<HTMLAnchorElement>(null);
  const [anchorId, setAnchorId] = useState<string | undefined>();

  useEffect(() => {
    if (!ref.current || !id) return;
    setAnchorId(virtualAnchorEncode(ref.current.textContent || undefined));
  }, [ref.current, id]);

  return (
    <Link
      ref={ref}
      className="relative w-fit flex items-center gap-1 group text-inherit"
      href={`#${id || anchorId}`}
    >
      {children}
      <span className="opacity-0 transition-opacity group-hover:opacity-100">
        <HashLinearIcon size={20} />
      </span>
    </Link>
  );
};