eso

Events Subscriber with Status Control

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^{version 0.1.3}
A Common JS Module, that I really should publish onto NPM. The point of this "pubsub emitter", is to sit at a top level of an app instance, ie: app.emitter, and allow you to create app States and Events, and use them together, or at least as a place to keep an organised record of your window events with their relative functions associated.

The Module itself works by returning an API as on require self executes and instantiates new instances of the Status and Listener Objects. They both share data via their private Scope Object, used internally.

API methods

Status By keeping States, callbacks can be made throughout the app when the status changes, as well as limiting the execution of Events.

params denoted with *asterix mean they are not required.

• get(*all:boolean) Passing true returns the current Status, whereas ommitting the param returns all the available states.
• add(state:string) Will create a new state by the name given.
• set(state:string) Sets the current status with the name of the state given. Will fail if the state does not exist.
• on(state:string, callback:function) When the designated state becomes set, the function given will be ran. Ie: callback is run on that state.

Listener Keeping your eventListeners organised, and lets you create and configure these listeners with what will be passed back to the functions you wish to fire, and whether or not they are limited by the app's current status.

• create(type:string, returns:Object) Create a window event listener, by passing the event type ie: 'mousemove', and what the event will return, based on the original event object.
• add(type:string, callback:function, *status:string) Adds a method to an existing eventListener, which can also be set to be only fired if the status matches the modules current scope status. The callback function you give it will be passed the event object you established as the returns object you stipulate in the create method.

Todo's

• Add remove methods to API.

Usage

Init

var Emitter = require('./eso);

// attach it to your App.
app.emitter = Emitter;

Make a state

app.emitter.status.add('bigbang'); // now state exists to use

// pass your funtion execute when status matches
app.emitter.status.on('bigbang', function() {
	console.log('and so it begins - quicker than you realise.');
})

// change state, and see console log for output.
app.emitter.status.set('bigbang');

Utilise Event Listeners

// build a window level event listener, returning cursor x co-ords
app.emitter.listeners.create('mousemove', { x: e.clientX });

// add a method to the mousemove event
app.emitter.listeners.add('mousemove', function(res){ 
	console.log(res.x); 
}, 'bigbang')