erspark2002/todo_app_ver3.html

## todo_app_ver3.html
<!DOCTYPE html>
<!--
NOTES:
  multiple components
  no refs
  uses state

  The <input/> has it's ref removed, and 'value' and 'onChange' properties added.
  The value is ALWAYS the value of this.state.description.
  this.state.description is initialised to an empty string in the TodoItem's constructor using this.state = {...}
  To change the input of the value when a key is pressed, you need to call this.setState({description: 'new value'}) and pass a new value.
  The new value is contained with the 'event' object, which is created in the onClick event.
  When this.setState({...}) is called, this causes render() to be called.
-->
<html>
  <head>
    <meta charset="utf-8">
    <script src="https://fb.me/react-with-addons-15.0.0.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.0.4/redux.min.js"></script>
    <script src="https://fb.me/react-dom-0.14.0.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
    <title>React Template with CDN Resources - JSX</title>
  </head>
  <body>
    <div id="app"></div>

    <script type="text/babel">
      console.log('start');
      const Component = React.Component;

      let count = 0;
      let todos = [{desc: 'milk', id: count++}, {desc: 'eggs', id: count++}];
      let todoList;

      class Todo extends Component {
        render() {
          return (
            <div>
              <TodoItem todoList={todoList}/>
              <TodoList todos={todos} ref={el=>{todoList=el}}/>
            </div>
          );
        }
      };
      class TodoItem extends Component {
        constructor() {
          super();
          this.state = {
            description: ''
          }
        }

        addItem(description) {
          todos.push({
            desc: description,
            id: count++
          });
          todoList.forceUpdate();
        }
        onChange(event) {
          this.setState({
            description: event.target.value
          });
        }
        render() {
          let input;
          return (
            <div>
              <input onChange={(event)=>{this.onChange(event)}} value={this.state.description}/>
              <button onClick={()=>this.addItem(this.state.description)}>Add</button>
            </div>
          );
        }
      }

      class TodoList extends Component {
        render() {
          console.log('--> TodoList todos:', todos);
          return (
            <ul>
              {todos.map(todo => (
                <li key={todo.id}>
                  {todo.desc}
                </li>
              ))}
            </ul>
          );
        }
      }

      ReactDOM.render(<Todo />, document.getElementById('app'));
      console.log('done');
    </script>
  </body>
</html>
	<!DOCTYPE html>
	<!--
	NOTES:
	multiple components
	no refs
	uses state

	The <input/> has it's ref removed, and 'value' and 'onChange' properties added.
	The value is ALWAYS the value of this.state.description.
	this.state.description is initialised to an empty string in the TodoItem's constructor using this.state = {...}
	To change the input of the value when a key is pressed, you need to call this.setState({description: 'new value'}) and pass a new value.
	The new value is contained with the 'event' object, which is created in the onClick event.
	When this.setState({...}) is called, this causes render() to be called.
	-->
	<html>
	<head>
	<meta charset="utf-8">
	<script src="https://fb.me/react-with-addons-15.0.0.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.0.4/redux.min.js"></script>
	<script src="https://fb.me/react-dom-0.14.0.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
	<title>React Template with CDN Resources - JSX</title>
	</head>
	<body>
	<div id="app"></div>

	<script type="text/babel">
	console.log('start');
	const Component = React.Component;

	let count = 0;
	let todos = [{desc: 'milk', id: count++}, {desc: 'eggs', id: count++}];
	let todoList;

	class Todo extends Component {
	render() {
	return (
	<div>
	<TodoItem todoList={todoList}/>
	<TodoList todos={todos} ref={el=>{todoList=el}}/>
	</div>
	);
	}
	};
	class TodoItem extends Component {
	constructor() {
	super();
	this.state = {
	description: ''
	}
	}

	addItem(description) {
	todos.push({
	desc: description,
	id: count++
	});
	todoList.forceUpdate();
	}
	onChange(event) {
	this.setState({
	description: event.target.value
	});
	}
	render() {
	let input;
	return (
	<div>
	<input onChange={(event)=>{this.onChange(event)}} value={this.state.description}/>
	<button onClick={()=>this.addItem(this.state.description)}>Add</button>
	</div>
	);
	}
	}

	class TodoList extends Component {
	render() {
	console.log('--> TodoList todos:', todos);
	return (
	<ul>
	{todos.map(todo => (
	<li key={todo.id}>
	{todo.desc}
	</li>
	))}
	</ul>
	);
	}
	}

	ReactDOM.render(<Todo />, document.getElementById('app'));
	console.log('done');
	</script>
	</body>
	</html>