react-examples/form-controlled.htm at master · arvindpdmn/react-examples · GitHub

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

<body>
    <div id="root"></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 NameForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
        name: '',
        sex: '', // will remain empty if user doesn't change selection
                 // defaultValue="Male" on <select> will have no affect
                 // could use defaultProps on NameForm
        address: '',
    };

    this.handleNameChange = this.handleNameChange.bind(this);
    this.handleSexChange = this.handleSexChange.bind(this);
    this.handleAddressChange = this.handleAddressChange.bind(this);

    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleNameChange(event) {
    this.setState({name: event.target.value.toUpperCase()});
  }

  handleSexChange(event) {
    this.setState({sex: event.target.value});
  }

  handleAddressChange(event) {
    this.setState({address: event.target.value});
  }

  handleSubmit(event) {
    alert(this.state.name + '\n' + this.state.sex + '\n' + this.state.address);
    event.preventDefault();
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Name:
          <input type="text" value={this.state.name} onChange={this.handleNameChange} />
        </label>
        <br/>

        <label>
          Sex:
          <select value={this.state.sex} onChange={this.handleSexChange}>
            <option value="Male">Male</option>
            <option value="Female">Female</option>
          </select>
        </label>
        <br/>

        <label>
          Address:
          <textarea value={this.state.address} onChange={this.handleAddressChange} />
        </label>
        <br/>

        <input type="submit" value="Submit" />
      </form>
    );
  }
}

ReactDOM.render(
  <NameForm />,
  document.getElementById('root')
);
    </script>
</body>

</html>