ReactJS + facebook/flux でカウンターのサンプル #JavaScript

目的

Web+DB Press Vol.87 の Flux の記事が素晴らしかったので、facebook/flux で書き換えてみた。
（記事では fluxxor）

ちなみに雑誌のサンプルコードはこちらの「Emerging Web Technology研究室」

下記todoサンプルを参考にした
- [https://github.com/facebook/flux/tree/master/examples/flux-todomvc]

ファイル構成

.
├── dest
│   └── app.js
├── index.html
├── package.json
└── src
    ├── app.jsx
    └── app_dispatcher.js

package

reactify ではなく babelify を使う

pacage.json

{
  "devDependencies": {
    "babelify": "^6.1.2",
    "browserify": "^10.2.4",
    "watchify": "^3.2.3"
  },
  "scripts": {
    "watch": "watchify -t babelify src/app.jsx -o dest/app.js -v"
  },
  "dependencies": {
    "flux": "^2.0.3",
    "keymirror": "^0.1.1",
    "object-assign": "^3.0.0",
    "react": "^0.13.3"
  }
}

$ npm install
$ npm run watch

code

src/app.jsx

var EventEmitter = require('events').EventEmitter;
var React = require('react');
var assign = require('object-assign');
var keyMirror = require('keymirror');

var AppDispatcher = require('./app_dispatcher');

var CounterConstants = keyMirror({
    UPDATE_COUNTER: null
});


// Store
var CHANGE_EVENT = 'change';
var counter = 0;

var CounterStore = assign({}, EventEmitter.prototype, {
    getCounter: function() {
        return counter;
    },
    emitChange: function() {
        this.emit(CHANGE_EVENT);
    },
    addChangeListener: function(callback) {
        this.on(CHANGE_EVENT, callback);
    },
    onUpdateCounter: function(value) {
        counter += value;
    }
});

AppDispatcher.register(function(action) {
    switch(action.actionType) {
        case CounterConstants.UPDATE_COUNTER:
            CounterStore.onUpdateCounter(action.value);
            CounterStore.emitChange();
            break;
        default:
            // no op
    }
});


// Action
var CounterActions = {
    plusCounter: function() {
        AppDispatcher.dispatch({
            actionType: CounterConstants.UPDATE_COUNTER,
            value: 1
        });
    },
    minusCounter: function() {
        AppDispatcher.dispatch({
            actionType: CounterConstants.UPDATE_COUNTER,
            value: -1
        });
    }
};


// View
function getCounterState() {
    return {
        value: CounterStore.getCounter()
    };
}

var CounterAppView = React.createClass({
    getInitialState: function() {
        return getCounterState();
    },
    componentDidMount: function() {
        CounterStore.addChangeListener(this.onChange);
    },
    render: function() {
        return (
            <div>
                <span>count: {this.state.value}</span>
                <CounterView />
            </div>
        );
    },
    onChange: function() {
        this.setState(getCounterState());
    }
});

var CounterView = React.createClass({
    render: function() {
        return (
            <div>
                <div>
                    <button onClick={this.onClickPlus}>+1</button>
                    <button onClick={this.onClickMinus}>-1</button>
                </div>
            </div>
        );
    },
    onClickPlus: function() {
        CounterActions.plusCounter();
    },
    onClickMinus: function() {
        CounterActions.minusCounter();
    }
});

React.render(
    <CounterAppView />,
    document.getElementById('app-container')
);

src/app_dispatcher.js

var Dispatcher = require('flux').Dispatcher;

module.exports = new Dispatcher();

index.html

<!doctype html>
<html lang="ja">
    <head>
        <meta charset="utf-8">
        <title>Flux</title>
    </head>
    <body>
        <div id="app-container"></div>

        <script src="dest/app.js"></script>
    </body>
</html>

表示

$ python -m SimpleHTTPServer 8000

http://localhost:8000

続き

ES6 の class などを使って書き換えてみた

感想

ES6で書き換えようかと思ったけどツラそう...
flux のライブラリは何を使うのがいいのやら...