Created
January 29, 2013 10:11
-
-
Save badsyntax/4663217 to your computer and use it in GitHub Desktop.
Standalone backbone events
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
var Events = (function() { | |
// Backbone.js 0.9.10 | |
// (c) 2010-2012 Jeremy Ashkenas, DocumentCloud Inc. | |
// Backbone may be freely distributed under the MIT license. | |
// For all details and documentation: | |
// http://backbonejs.org | |
// Create a local reference to array methods. | |
var array = []; | |
var push = array.push; | |
var slice = array.slice; | |
var splice = array.splice; | |
// Backbone.Events | |
// --------------- | |
// Regular expression used to split event strings. | |
var eventSplitter = /\s+/; | |
// Implement fancy features of the Events API such as multiple event | |
// names `"change blur"` and jQuery-style event maps `{change: action}` | |
// in terms of the existing API. | |
var eventsApi = function (obj, action, name, rest) { | |
if (!name) return true; | |
if (typeof name === 'object') { | |
for (var key in name) { | |
obj[action].apply(obj, [key, name[key]].concat(rest)); | |
} | |
} else if (eventSplitter.test(name)) { | |
var names = name.split(eventSplitter); | |
for (var i = 0, l = names.length; i < l; i++) { | |
obj[action].apply(obj, [names[i]].concat(rest)); | |
} | |
} else { | |
return true; | |
} | |
}; | |
// Optimized internal dispatch function for triggering events. Tries to | |
// keep the usual cases speedy (most Backbone events have 3 arguments). | |
var triggerEvents = function (events, args) { | |
var ev, i = -1, | |
l = events.length; | |
switch (args.length) { | |
case 0: | |
while (++i < l)(ev = events[i]).callback.call(ev.ctx); | |
return; | |
case 1: | |
while (++i < l)(ev = events[i]).callback.call(ev.ctx, args[0]); | |
return; | |
case 2: | |
while (++i < l)(ev = events[i]).callback.call(ev.ctx, args[0], args[1]); | |
return; | |
case 3: | |
while (++i < l)(ev = events[i]).callback.call(ev.ctx, args[0], args[1], args[2]); | |
return; | |
default: | |
while (++i < l)(ev = events[i]).callback.apply(ev.ctx, args); | |
} | |
}; | |
// A module that can be mixed in to *any object* in order to provide it with | |
// custom events. You may bind with `on` or remove with `off` callback | |
// functions to an event; `trigger`-ing an event fires all callbacks in | |
// succession. | |
// | |
// var object = {}; | |
// _.extend(object, Backbone.Events); | |
// object.on('expand', function(){ alert('expanded'); }); | |
// object.trigger('expand'); | |
// | |
var Events = { | |
// Bind one or more space separated events, or an events map, | |
// to a `callback` function. Passing `"all"` will bind the callback to | |
// all events fired. | |
on: function (name, callback, context) { | |
if (!(eventsApi(this, 'on', name, [callback, context]) && callback)) return this; | |
this._events || (this._events = {}); | |
var list = this._events[name] || (this._events[name] = []); | |
list.push({ | |
callback: callback, | |
context: context, | |
ctx: context || this | |
}); | |
return this; | |
}, | |
// Bind events to only be triggered a single time. After the first time | |
// the callback is invoked, it will be removed. | |
once: function (name, callback, context) { | |
if (!(eventsApi(this, 'once', name, [callback, context]) && callback)) return this; | |
var self = this; | |
var once = _.once(function () { | |
self.off(name, once); | |
callback.apply(this, arguments); | |
}); | |
once._callback = callback; | |
this.on(name, once, context); | |
return this; | |
}, | |
// Remove one or many callbacks. If `context` is null, removes all | |
// callbacks with that function. If `callback` is null, removes all | |
// callbacks for the event. If `name` is null, removes all bound | |
// callbacks for all events. | |
off: function (name, callback, context) { | |
var list, ev, events, names, i, l, j, k; | |
if (!this._events || !eventsApi(this, 'off', name, [callback, context])) return this; | |
if (!name && !callback && !context) { | |
this._events = {}; | |
return this; | |
} | |
names = name ? [name] : _.keys(this._events); | |
for (i = 0, l = names.length; i < l; i++) { | |
name = names[i]; | |
if (list = this._events[name]) { | |
events = []; | |
if (callback || context) { | |
for (j = 0, k = list.length; j < k; j++) { | |
ev = list[j]; | |
if ((callback && callback !== ev.callback && callback !== ev.callback._callback) || (context && context !== ev.context)) { | |
events.push(ev); | |
} | |
} | |
} | |
this._events[name] = events; | |
} | |
} | |
return this; | |
}, | |
// Trigger one or many events, firing all bound callbacks. Callbacks are | |
// passed the same arguments as `trigger` is, apart from the event name | |
// (unless you're listening on `"all"`, which will cause your callback to | |
// receive the true name of the event as the first argument). | |
trigger: function (name) { | |
if (!this._events) return this; | |
var args = slice.call(arguments, 1); | |
if (!eventsApi(this, 'trigger', name, args)) return this; | |
var events = this._events[name]; | |
var allEvents = this._events.all; | |
if (events) triggerEvents(events, args); | |
if (allEvents) triggerEvents(allEvents, arguments); | |
return this; | |
}, | |
// An inversion-of-control version of `on`. Tell *this* object to listen to | |
// an event in another object ... keeping track of what it's listening to. | |
listenTo: function (obj, name, callback) { | |
var listeners = this._listeners || (this._listeners = {}); | |
var id = obj._listenerId || (obj._listenerId = _.uniqueId('l')); | |
listeners[id] = obj; | |
obj.on(name, typeof name === 'object' ? this : callback, this); | |
return this; | |
}, | |
// Tell this object to stop listening to either specific events ... or | |
// to every object it's currently listening to. | |
stopListening: function (obj, name, callback) { | |
var listeners = this._listeners; | |
if (!listeners) return; | |
if (obj) { | |
obj.off(name, typeof name === 'object' ? this : callback, this); | |
if (!name && !callback) delete listeners[obj._listenerId]; | |
} else { | |
if (typeof name === 'object') callback = this; | |
for (var id in listeners) { | |
listeners[id].off(name, callback, this); | |
} | |
this._listeners = {}; | |
} | |
return this; | |
} | |
}; | |
return Events; | |
}()); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function MyClass() { | |
this.prop = 'Hello'; | |
}; | |
$.extend(MyClass.prototype, Events); | |
MyClass.prototype.method = function() { | |
this.trigger('methodCalled'); | |
}; | |
var instance = new MyClass(); | |
instance.on('methodCalled', function() { | |
alert('Method called'); | |
}); | |
instance.method(); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
jQuery events are not intended for non-DOM objects. FFS. See here: http://jsbin.com/amaxes/1
So, we gotta resort to build a custom event emitter. Why not backbone events?