1class ImageUpload extends React.Component {
2  state = {
3    files: []
4  }
5
6  fileSelectedHandler = (e) => {
7    this.setState({ files: [...this.state.files, ...e.target.files] })
8  }
9
10  render() {
11    return (
12      <form>
13        <div><h2>Upload images</h2></div>
14        <h3>Images</h3>
15        <input type="file" multiple onChange={this.fileSelectedHandler} />
16      </form>
17    )
18  }
19}
20
21
22ReactDOM.render(<ImageUpload />, document.getElementById('app'))