springboot-react-webpack/src/main/resources/static/js/comment_form.jsx

import React from 'react';

class CommentForm extends React.Component {
  getInitialState() {
    return { author: '', text: '' };
  }
  handleAuthorChange(e) {
    this.setState({ author: e.target.value });
  }
  handleTextChange(e) {
    this.setState({ text: e.target.value });
  }
  handleSubmit(e) {
    e.preventDefault();
    const author = this.state.author.trim();
    const text = this.state.text.trim();
    if (!text || !author) {
      return;
    }
    this.props.onCommentSubmit({ author, text });
    this.setState({ author: '', text: '' });
  }
  render() {
    return (
      <form className="commentForm" onSubmit={this.handleSubmit}>
        <input
          type="text"
          placeholder="Your name"
          value={this.state.author}
          onChange={this.handleAuthorChange}
        />
        <input
          type="text"
          placeholder="Say something..."
          value={this.state.text}
          onChange={this.handleTextChange}
        />
        <input type="submit" value="Post" />
      </form>
    );
  }
}
CommentForm.propTypes = {
  author: React.PropTypes.string,
  text: React.PropTypes.string,
  onCommentSubmit: React.PropTypes.func,
};