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Event-emitter module for Javascript objects
/* 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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