About

About

Flux is an architecture for building client-side web applications.

Architecture

Dispatcher

Pub-sub

A dispatcher emits events (.dispatch()) to its listeners (.register(fn)).

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

d = new Dispatcher();

// send
d.dispatch({ action: 'edit', ... };

// receive
token = d.register(function (payload) {
  payload.action === 'edit'
})

Ensuring proper order

With multiple listeners, you can ensure one is fired after another using .waitFor().

token1 = d.register(...);

token2 = d.register(function (payload) {

  // ensure receiver 1 is fired before this
  d.waitFor([ token1 ]);
  
  // process here
})

Subclassing

Object.assign is the preferred way to subclass Dispatcher (think $.extend).
You can also make action creators, which are shortcuts for dispatch().

var Dispatcher = require('flux').Dispatcher;
var assign = require('object-assign');

var AppDispatcher = assign({}, Dispatcher.prototype, {

  // action creator
  handleViewAction(action) {
    this.dispatch({
      source: 'VIEW_ACTION',
      action: action
    })
  } 

})

Stores

Plain objects

Stores are just like objects.

var TodoStore = { list: [] };

Events

Sometimes they’re eventemitters, too. Usually it’s used to emit change events for views to pick up.

var TodoStore = assign({}, EventEmitter.prototype, {
  ...
});

TodoStore.emit('change');
TodoStore.on('change', function () { ... });

Model logic

Logic can sometimes belong in stores.

{
  isAllActive() {
    return this.list.every(item => item.active);
  }
}

Stores and dispatchers

Instantiate

Make a Dispatcher and Stores.

d = new Dispatcher();
TabStore = { tab: 'home' };

Updating data

Dispatch events to alter the store.

d.dispatch({ action: 'tab.change', tab: 'timeline' });

d.register(function (data) {
  if (data.action === 'tab.change') {
    TabStore.tab = data.tab;
  }
});

With Views

Listen to dispatchers

Views (React Components) can listen to Dispatchers.

var TodoApp = React.createClass({

  componentDidMount() {
    this.token = AppDispatcher.register((payload) => {
      switch (payload.action) {
        case 'tab.change':
          this.render();
          // ...
      }
    });
  },
  
  componentDidUnmount() {
    AppDispatcher.unregister(this.token);
  }
  
});

Listen to Stores

Or to Stores’s change events.

{
  componentDidMount() {
    TodoStore.on('change', this.onChange);
  },
  
  componentDidUnmount() {
    TodoState.removeListener('change', this.onChange);
  },
  
  onChange(data) {
    // ...
  }
}

Also see

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