• Sometimes for responsive layouts, we need to adapt the height to the width of the components. CSS does not allow this dynamic change; jQuery is the traditional way to do it.
  • React doesn’t rely on JQuery and is relatively easy to implement. Just change width after DidMount
  • Try on Codepen
  • Note that resize also synchronizes changes, requiring a listener to be registered
class Card extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      width: props.width || - 1.height: props.height || - 1,
    }
  }

  componentDidMount() {
    this.updateSize();
    window.addEventListener('resize'.this.updateSize.bind(this));
  }

  componentWillUnmount() {
    window.removeEventListener('resize'.this.updateSize.bind(this));
  }

  updateSize() {
    try {
      const parentDom = ReactDOM.findDOMNode(this).parentNode;
      let { width, height } = this.props;
      // If height and width are not specified, the props are adaptive
      if(! width) { width = parentDom.offsetWidth; }if(! height) { height = width *0.38;
      }
      this.setState({ width, height });
    } catch (ignore) {
    }
  }

  render() {
    return (
      <div className="test" style={ { width: this.state.width.height: this.state.height } }>
        {`${this.state.width} x ${this.state.height}`}
      </div>
    );
  }
}

ReactDOM.render(
  <Card/>.document.getElementById('root'));Copy the code

The resources

  • React lifecycle
React lifecycle