How to get the width of a react element

Question

Im trying to create a range input that displays a tooltip right above the slider thumb.

I went through some vanilla JS examples online and it seems that I need to ha

Answer 1

    class MyComponent extends Component {
      constructor(props){
        super(props)
        this.myInput = React.createRef()
      }

      componentDidMount () {
        console.log(this.myInput.current.offsetWidth)
      }

      render () {
        return (
        // new way - as of React@16.3
        
some elem
        // legacy way
        // 
 this.myInput = ref}>some elem
        )
      }
    }