Check box

by Allie Yu

HTML

<div id="root"></div>

CSS

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

#root {
  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: [
      	{ id: 1, text: "Learn JavaScript", done: false },
        { id: 2, text: "Learn React", done: false },
        { id: 3, text: "Play around in JSFiddle", done: true },
        { id: 4, text: "Build something awesome", done: true }
      ]
    }
  }
  
  handleCheckbox = (event, id) => {
  	let items = this.state.items.map(item => item.id === id ? 
    	Object.assign({}, item, {done: event.target.checked}) :
      item)
    	this.setState({
      	items: items
      })
  }
  
  render() {
    return (
      <div>
        <h2>Todos:</h2>
        <ol>
        {this.state.items.map(item => (
          <li key={item.id}>
            <label>
              <input type="checkbox" checked={item.done} onChange={(event) => this.handleCheckbox(event, item.id)}
                value={item}
              /> 
              <span className={item.done ? "done" : ""}>{item.text}</span>
            </label>
          </li>
        ))}
        </ol>
      </div>
    )
  }
}

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