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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<script src="https://fb.me/react-15.1.0.js"></script>
<script src="https://fb.me/react-dom-15.1.0.js"></script>
  <div id="root"></div>
</body>
</html>
 
​
 
class App extends React.Component {
  constructor(props) {
    super(props);
    
    this.state = {
      clickedId: -1,
    };
    
    this.handleClick = this.handleClick.bind(this);
  }
  
  handleClick(event) {
    const id = event.target.id;
    this.setState({
      clickedId: id,
    });
  }
  
  render() {
    return (
      <div>
        <h1>Clicked id: {this.state.clickedId}</h1>
        <button id="asd" onClick={this.handleClick}>Asd</button>
        <button id="qwe" onClick={this.handleClick}>Qwe</button>
      </div>
    );
  }
}
​
ReactDOM.render(<App />, document.getElementById('root'));
Output

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hinokpro
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