Good Component

good_component.js

var GoodComponent = withScroll(React.createClass({
  getInitialState: function() {
    return {
      someNewState: ''
    }
  },
  componentWillReceiveProps: function(nextProps) {
    var {scroll} = this.props;

    // do something with scroll props

  },
  render: function() {
    var {someNewState} = this.state
    return (
      <div
        className="my-fixed-div"
        style={{
          visibility: (this.props.scroll >= 100) ? 'visible' : 'hidden'
        }} />
    )
  }
}));