React Controller Example

by merganser

HTML

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

CSS

body {
  background: #ccc;
  padding: 20px;
  font-family: Helvetica;
}
div.todo{border:1px solid #999;padding:15px;
background-color:#fff;}

#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 = {
    	items: [
      	{ text: "Learn JavaScript", done: false, id:1 },
        { text: "Learn React", done: false, id:2 },
        { text: "Play around in JSFiddle", done: true, id:3 },
        { text: "Build something awesome", done: true , id:4}
      ]
    }
  }
  
  render() {
    return (
    
      <div class="todo">
        <h2>Todos:</h2>
        <ol>
        {this.state.items.map(item => (
          <li key="{item.id.toString()}">
            <label><h1>{item.id}</h1>
              <input type="checkbox" disabled readOnly checked={item.done} /> 
              <span className={item.done ? "done" : ""}>{item.text}</span>
            </label>
          </li>
        ))}
        </ol>
      </div>
      
    )
  }
}

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

const container = document.getElementById("app");
const root = ReactDOM.createRoot(container);
root.render(<TodoApp />);