React-Tutorial/events.html at main · BYU-CS-260/React-Tutorial · GitHub

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<html>
  <head>
    <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
    <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  </head>
  <body>
    <div id="root"></div>
    <script type="text/babel">
    function Form() {
      function handleSubmit(e) {
        e.preventDefault();
        alert('You clicked submit.');
      }

      return (
        <form onSubmit={handleSubmit}>
          <button type="submit">Submit</button>
        </form>
      );
    }

    class Toggle extends React.Component {
      constructor(props) {
        super(props);
        this.state = {isToggleOn: true};

        // This binding is necessary to make `this` work in the callback
        this.handleClick = this.handleClick.bind(this);
      }

      handleClick() {
        this.setState(prevState => ({
          isToggleOn: !prevState.isToggleOn
        }));
      }

      render() {
        return (
          <button onClick={this.handleClick}>
            {this.state.isToggleOn ? 'ON' : 'OFF'}
          </button>
        );
      }
    }

    function Both() {
      return (
        <div>
          <Form />
          <Toggle />
        </div>
      );
    }
    const root = ReactDOM.createRoot(document.getElementById('root'));
    root.render(<Both />);
    </script>
  </body>
</html>