react-examples/ref-callback.htm at master · arvindpdmn/react-examples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>React Ref Callback</title>
</head>

<body>
    <div id="root"></div>

    <div id="root2"></div>

    <script src="https://unpkg.com/react@15/dist/react.js"></script>
    <script src="https://unpkg.com/react-dom@15/dist/react-dom.js"></script>
    <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>

    <script type="text/jsx">
class CustomTextInput extends React.Component {
  constructor(props) {
    super(props);
    this.focus = this.focus.bind(this);
  }

  focus() {
    // Explicitly focus the text input using the raw DOM API
    this.textInput.focus();
  }

  render() {
    // Use the `ref` callback to store a reference to the text input DOM
    // element in this.textInput.
    return (
      <div>
        <input
          type="text"
          ref={(input) => { this.textInput = input; }} />
        <input
          type="button"
          value="Focus the text input"
          onClick={this.focus}
        />
      </div>
    );
  }
}

ReactDOM.render(
  <CustomTextInput />,
  document.getElementById('root')
);

// Use of ref on a custom component
class AutoFocusTextInput extends React.Component {
  componentDidMount() {
    this.textInput.focus();
  }

  render() {
    return (
      <CustomTextInput
        ref={(input) => { this.textInput = input; }} />
    );
  }
}

ReactDOM.render(
  <AutoFocusTextInput />,
  document.getElementById('root2')
);

    </script>
</body>

</html>