React Hook 在页面加载时滚动到溢出 div 的底部

Question

I would like to scroll only an overflowing div while keeping the rest of the page at the normal starting position. Right now I'm getting a Cannot read property 'scrollIntoView' of null error when calling UseEffect

Code

import React, {Fragment, useEffect, useRef} from 'react';

const VideoPlayer = ({...foo...}) => {

   const chatRef = useRef(null)
       const scroll = () => {
           chatRef.current.scrollIntoView();
       }


   useEffect(() => {
           foo_function
           scroll()
       }, [foo_function]);

   }

   return (
   ...other-non-overflowing-div-content...

   <div>
      <div ref={chatRef}>
         <Link to={'/login'}>
           <p className='chat-sign-in'>Sign in to usechat</p>
         </Link>
       </div>
   </div>

   )
 }

Answer 1

You don't need the useRef . Try a callback ref instead. You can also pass it as a function with same signature.

<div ref={el => el.scrollintoview()}/>

Or

const cb = el => {
  foo();
  el.scrollintoview();
}

<div ref={cb}/>

Answer 2

Use useLayoutEffect instead useEffect

Here is a sandbox for a simple use-case

https://codesandbox.io/s/crazy-pasteur-44rfz?file=/src/App.js