How to get the width of a react element

    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
        <div ref={this.myInput}>some elem</div>
        // legacy way
        // <div ref={(ref) => this.myInput = ref}>some elem</div>
        )
      }
    }