React

by jonahe

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

class TodoApp extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      text: "hello.."
    }
  }
  
  render() {
    return (
      <div>
        <Hello text={ this.state.text  } setText={  (newText) => this.setState({ text: newText })   } />
      </div>
    )
  }
}

const Hello = ({ text, setText }) => {
	return <div>
    <h1>Text = { text } </h1>
	  <button onClick={ () => setText("New text..")  }>Change text </button>
	</div>
}

ReactDOM.render(<TodoApp />, document.querySelector("#app"))