TodoMVC is Flux's official example, but still complicated for a beginner.
This repo is its simplified version. I hope it helpful for you to understand Flux.
$ git clone [email protected]:ruanyf/flux-todomvc-demo.git
$ cd flux-todomvc-demo && npm install
$ npm startVisit http://127.0.0.1:8080 with your browser.
If you want to get a static build, please run npm run build.
$ npm run buildNow open index.html in your browser.
Flux for stupid people and its demo is a great start guide.
index.html is used to load bundle.js.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Flux • TodoMVC</title>
<link rel="stylesheet" href="todomvc-common/base.css">
<link rel="stylesheet" href="css/app.css">
</head>
<body>
<section id="todoapp"></section>
<footer id="info">
<p>Double-click to edit a todo</p>
</footer>
<script src="js/bundle.js"></script>
</body>
</html>Our TodoMVC lives in the #todoapp section.
buddle.js is built from App.js.
// webpack.config.js
module.exports = {
entry: './js/app.js',
output: {
filename: './js/bundle.js'
},
module: {
loaders:[
{ test: /\.js[x]?$/, exclude: /node_modules/, loaders: ['babel-loader'] },
]
}
};App.js is the entry file.
// js/app.js
var React = require('react');
var TodoApp = require('./components/TodoApp');
React.render(
<TodoApp />,
document.getElementById('todoapp')
);You could see TodoApp is the top-level component.
TodoApp is composed of 3 components of Header, MainSection and Footer.
// js/components/TodoApp.js
var React = require('react');
var Footer = require('./Footer');
var Header = require('./Header');
var MainSection = require('./MainSection');
var TodoApp = React.createClass({
render: function() {
return (
<div>
<Header />
<MainSection data={this.state} />
<Footer data={this.state} />
</div>
);
},
});
module.exports = TodoApp;The main part of Header is TodoTextInput used to input new Todo items.
var React = require('react');
var TodoTextInput = require('./TodoTextInput');
var AppDispatcher = require('../dispatcher/AppDispatcher');
var Header = React.createClass({
render: function() {
return (
<header id="header">
<h1>todos</h1>
<TodoTextInput
id="new-todo"
placeholder="What needs to be done?"
onSave={this._onSave}
/>
</header>
);
},
_onSave: function(text) {
if (text.trim()){
AppDispatcher.dispatch({
actionType: 'TODO_CREATE',
text: text
});
}
}
});
module.exports = Header;MainSection is composed of TodoItem.
var React = require('react');
var TodoItem = require('./TodoItem');
var MainSection = React.createClass({
render: function() {
if (Object.keys(this.props.data).length < 1) {
return null;
}
var allTodos = this.props.data;
var todos = [];
for (var key in allTodos) {
todos.push(<TodoItem key={key} todo={allTodos[key]} />);
}
return (
<section id="main">
<input
id="toggle-all"
type="checkbox"
/>
<label htmlFor="toggle-all">Mark all as complete</label>
<ul id="todo-list">{todos}</ul>
</section>
);
},
});
module.exports = MainSection;The Footer shows some statics and a clear button.
var React = require('react');
var Footer = React.createClass({
render: function() {
return (
<footer id="footer">
<span id="todo-count">
<strong>
{itemsLeft}
</strong>
{itemsLeftPhrase}
</span>
{clearCompletedButton}
</footer>
);
},
});
module.exports = Footer;When TodoApp is loaded, its state is all existing TodoItems.
// js/component/TodoApp.js
getInitialState: function() {
return TodoStore.getAll();
},
render: function() {
return (
<div>
<Header />
<MainSection data={this.state} />
<Footer data={this.state} />
</div>
);
},Now user inputs a Todo item into TodoTextInput.
// js/components/TodoTextInput.js
var React = require('react');
var ENTER_KEY_CODE = 13;
var TodoTextInput = React.createClass({
getInitialState: function() {
return {
value: this.props.value || ''
};
},
render: function() /*object*/ {
return (
<input
className={this.props.className}
id={this.props.id}
placeholder={this.props.placeholder}
onBlur={this._save}
onChange={this._onChange}
onKeyDown={this._onKeyDown}
value={this.state.value}
autoFocus={true}
/>
);
},
_save: function() {
this.props.onSave(this.state.value);
this.setState({
value: ''
});
},
_onChange: function(/*object*/ event) {
this.setState({
value: event.target.value
});
},
_onKeyDown: function(event) {
if (event.keyCode === ENTER_KEY_CODE) {
this._save();
}
}
});
module.exports = TodoTextInput;You could see, when TodoTextInput loses the focus, or user presses down the Enter key, this.props.onSave(this.state.value) will be called.
The following is its code. it uses AppDispatcher.dispatch to send an action TODO_CREATE.
// js/components/Header.js
_onSave: function(text) {
if (text.trim()){
AppDispatcher.dispatch({
actionType: 'TODO_CREATE',
text: text
});
}
}AppDispatcher creates a item in TodoStore. Then, TodoStore emits a change event.
// js/dispatcher/AppDispatcher.js
var Dispatcher = require('flux').Dispatcher;
var AppDispatcher = new Dispatcher();
var TodoStore = require('../stores/TodoStore');
AppDispatcher.register(function(action) {
var text;
switch(action.actionType) {
case 'TODO_CREATE':
text = action.text.trim();
if (text !== '') {
TodoStore.create(text);
TodoStore.emit('change');
}
break;
default:
// no op
}
});
module.exports = AppDispatcher;On another side, TodoApp listens the change event. this._onChange is the callback of change event.
// js/components/TodoApp.js
componentDidMount: function() {
TodoStore.on('change', this._onChange);
},
componentWillUnmount: function() {
TodoStore.removeListener('change', this._onChange);
},TodoApp gets all Todo items in the store, and puts them into TodoApp state object. Then, make a forced re-rendering of TodoApp.
_onChange: function() {
this.state = TodoStore.getAll();
this.forceUpdate();
}Now we can see the new Todo items in the browser.
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