React

by erickramer

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 = {
    	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 }
      ],
      showAddField: false,
      addItemFieldText: ""
    }
  }
  
  onItemChange(id, checked) {
    const { items } = this.state;
    const item = items.find((el) => { return el.id == id; } )
		item.done = checked
    this.setState({items: [...items]})
  }
  
  onAddBtnClicked() {
  	const { showAddField, items, addItemFieldText } = this.state;
    if (!showAddField) {
    	this.setState({showAddField: true});
    } else if(addItemFieldText) {
      const newItem = {id: Math.round(Math.random()*100000), text: addItemFieldText, done: false};
      this.setState({ showAddField: false, items: [...items, newItem], addItemFieldText: ""});
    }
  }
  
  onAddItemFieldChange(e) {
    this.setState({addItemFieldText: e.currentTarget.value})
  }
  
  onAddItemFieldKeyUp(e) {
  	if (e.keyCode == 13) {
    	this.onAddBtnClicked()
    }
  }
  
  render() {
  	const { showAddField, addItemFieldText } = this.state;
    return (
      <div>
        <h2>Todos:</h2>
        <ol>
        {this.state.items.map(item => (
          <li key={item.id}>
            <label>
              <input onChange={(e) => {this.onItemChange(item.id, e.currentTarget.checked)}} type="checkbox" readOnly checked={item.done} /> 
              <span className={item.done ? "done" : ""}>{item.text}</span>
            </label>
          </li>
        ))}
        </ol>
        { showAddField && <input autoFocus type="text" value={addItemFieldText} onChange={this.onAddItemFieldChange.bind(this)} onKeyUp={this.onAddItemFieldKeyUp.bind(this)} /> }
        <button onClick={this.onAddBtnClicked.bind(this)} type="button">+</button>
      </div>
    )
 ...