JSFiddle - React, Tailwind, and code Playground

by Allie Yu

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>
<div id="root"></div>

Babel + JSX

class App extends React.Component {
  constructor(props) {
    super(props);

    this.textInput = null;

    this.setTextInputRef = element => {
      this.textInput = element;
    };

    this.focusTextInput = () => {
      // Focus the text input using the raw DOM API
      if (this.textInput) this.textInput.focus();
    };
  }

  componentDidMount() {
    // autofocus the input on mount
    this.focusTextInput();
  }

  render() {
    // Use the `ref` callback to store a reference to the text input DOM
    // element in an instance field (for example, this.textInput).
    return (
      <div>
        <input
          type="text"
          ref={this.setTextInputRef}
        />
        <input
          type="button"
          value="Focus the text input"
          onClick={this.focusTextInput}
        />
      </div>
    );
  }
}

let target = document.getElementById('root');
ReactDOM.render(<App />, target);