Auto-scrolling animation in React.js using react-spring

React JSJavascript LibraryFront End Technology

In this article, we will see how to create a scroll to top animation in React JS using the react-spring package.

First create a react project −

npx create-react-app tutorialpurpose

Now go to the project directory −

cd tutorialpurpose

Example

Install the react-spring package −

npm install react-spring

react-spring is used to add Spring concept based animations to our website.

Next,Add the following lines of code in App.js

import React,{useState} from 'react'
import { useSpring, animated } from 'react-spring'

export default function App(){
   const [flip, set] = useState(false)

   const words = ['We', 'came.', 'We', 'saw.', 'We', 'hold', 'it s', 'hands.']

   const { scroll } = useSpring({
      scroll: (words.length - 1) * 50,
      from: { scroll: 0 },
      reset: true,
      reverse: flip,
      delay: 200,
      onRest: () => set(!flip),
   })
   return (
      <animated.div
      style={{
         position: 'relative',
         width: '100%',
         height: 60,
         overflow: 'auto',
         fontSize: '1em',
         marginTop:200 ,
         border:"1px solid black"
      }}
      scrollTop={scroll}>
      {words.map((word, i) => (
         <div
            key={`${word}_${i}`}
            style={{ width: '100%', height: 50, textAlign: 'center' }}>
            {word}
         </div>
      ))}
      </animated.div>
   )
}

Explanation

In the scroll attribute of spring object, we defined how much we have to scroll. If you change the value from 50 to 20, it will only scroll three words

The from attribute indicates from where to start scrolling; "0" means start scrolling from the beginning.

We also have some extra attributes like

  • reset which is meant for looping

  • reverse signifies when the counting should start or end,

  • delay to introduce time delay between animation, and

  • onRest indicates what to do on when the counting stops.

Output

On execution, it will produce the following output −

raja
Published on 28-Sep-2021 11:16:30
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