Created
July 5, 2010 11:30
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Event-emitter module for Javascript objects
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/* Abstract event binding | |
Example: | |
var MyEventEmitter = function(){}; | |
MyEventEmitter.prototype = new AbstractEventsDispatcher; | |
var emitter = new MyEventEmitter(); | |
// Bind to single event | |
emitter.bind('foo_event', function(data){ alert(data)} ); | |
// Bind to all | |
emitter.bind_all(function(event_name, data){ alert(data) }); | |
// Bind to all except some | |
emitter.bind_all_except(['except_this_one', 'and_this_one'], function(event_name, data){ alert(data) }); | |
--------------------------------------------------------*/ | |
var AbstractEventsDispatcher = function(){}; | |
AbstractEventsDispatcher.prototype = { | |
callbacks: {}, | |
global_callbacks: [], | |
bind: function(event_name, callback){ | |
this.callbacks[event_name] = this.callbacks[event_name] || []; | |
this.callbacks[event_name].push(callback); | |
return this;// chainable | |
}, | |
trigger: function(event_name, data){ | |
this.dispatch(event_name, data); | |
this.dispatch_global(event_name, data); | |
return this; | |
}, | |
bind_all: function(callback){ | |
this.global_callbacks.push(callback); | |
return this; | |
}, | |
bind_all_except: function(except, handler){ | |
this.bind_all(function(event_name, event_data){ | |
if(except.indexOf(event_name) > -1) return false; | |
handler(event_name, event_data) | |
}); | |
return this | |
}, | |
dispatch: function(event_name, data){ | |
var chain = this.callbacks[event_name]; | |
if(typeof chain == 'undefined') return; // no callbacks for this event | |
for(var i = 0; i < chain.length; i++){ | |
chain[i]( data ) | |
} | |
}, | |
dispatch_global: function(event_name, data){ | |
for(var i = 0; i < this.global_callbacks.length; i++){ | |
this.global_callbacks[i]( event_name, data ) | |
} | |
} | |
}; |
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