Created
June 16, 2014 10:27
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<body> | |
</body> | |
</html> |
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function Emitter() { | |
this._events = {}; | |
}; | |
function toArray(obj) { | |
if (typeof obj === 'object'){ | |
return Array.prototype.slice.call(obj); | |
} else { | |
return []; | |
} | |
} | |
function alias(name) { | |
return function aliasClosure() { | |
return this[name].apply(this, arguments); | |
}; | |
} | |
function indexOfListeners(haystack, needle) { | |
for (var i = 0, len = haystack.length; i < len; i++) { | |
if (haystack[i] == needle) { | |
return i; | |
} | |
} | |
return -1; | |
} | |
var fn = Emitter.prototype; | |
fn._getEvents = function () { | |
return this._events; | |
}; | |
fn.getListeners = function (event) { | |
var events = this._getEvents(); | |
var response; | |
response = events[event] || []; | |
return response; | |
}; | |
fn.addListener = function (event, listener) { | |
var events = this._getEvents(); | |
var eventsArray = this.getListeners(event); | |
if (eventsArray.length == 0) { | |
//create a new event | |
events[event] = [listener]; | |
} else { | |
events[event].push(listener); | |
} | |
}; | |
fn.on = alias('addListener'); | |
fn.removeListener = function (event, listener) { | |
var eventsArray = this.getListeners(event); | |
var index = indexOfListeners(eventsArray, listener); | |
if (index !== -1) { | |
eventsArray.splice(index, 1); | |
} | |
}; | |
fn.off = alias('removeListener'); | |
fn.emit = function () { | |
var args = toArray(arguments); | |
var event = args.splice(0 ,1); | |
var cargs = args.slice(); | |
var eventArray = this.getListeners(event); | |
for (var i = 0, len = eventArray.length; i < len; i++) { | |
var callback = eventArray[i]; | |
if (cargs.length === 0) { | |
callback.apply(this); | |
} else { | |
callback.apply(this, cargs[i]); | |
} | |
} | |
}; | |
var grid = new Emitter(); | |
var callback = function () { | |
console.log('cool kid'); | |
} | |
grid.addListener('logout', callback); | |
grid.addListener('logout', function() { | |
console.log('bitch out'); | |
}); | |
grid.off('logout', callback); | |
grid.emit('logout'); | |
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