select.js

class ParentComponent extends React.Component {
  handleChange(val) {
    this.setState({val: val})
  }
  render() {
    <Select onChange={handleChange} />
  }
}

class Select extends React.Component {
  handleClick() {
    this.props.onChange(this.state.value);
  }

  render() {
    <div>
      <span onClick={this.handleClick}></span>
      <span></span>
      <span></span>
    </div>
  }
}