mako-event-emitter

API

EventEmitter.prototype.on(type, fn)

• type string - message type
• fn function - handler to add

Add a handler for a message type

EventEmitter.prototype.on = function (type, fn, ctx) {
    var wrapped;
 
    ctx = ctx || this;	
    wrapped = function () {
        fn.apply(ctx, Array.prototype.slice.call(arguments, 0));
    };
 
    fn.wrapped = wrapped;
 
    if(!this.listeners[type]) {
        this.listeners[type] = [wrapped];
    }
    else {
        this.listeners[type].push(wrapped);
    }
};

EventEmitter.prototype.once(type, fn)

• type string - message type
• fn function - handler to add

Add a handler for a message type which removes itself after a single execution

EventEmitter.prototype.once = function (type, fn, ctx) {
    var wrapped;
 
    ctx = ctx || this;
 
    wrapped = function () {
        ctx.off(type, fn);
        fn.apply(ctx, Array.prototype.slice(arguments, 0));
    };
 
    fn.wrapped = wrapped;
 
    if(!this.listeners[type]) {
        this.listeners[type] = [wrapped];
    }
    else {
        this.listeners[type].push(wrapped);
    }	
};

EventEmitter.prototype.off(type, fn)

• type string - message type
• fn function - handler to remove

Remove a handler for a message type

EventEmitter.prototype.off = function (type, fn) {
    var index, index2;
 
    if(this.listeners[type]) {
        index = this.listeners[type].indexOf(fn);
        index2 = this.listeners[type].indexOf(fn.wrapped);
        if(index > -1) {
            this.listeners[type].splice(index, 1);
            return true;
        }
        else if(index2 > -1) {
            this.listeners[type].splice(index2, 1);
            return true;
        }
        else {
            return false;
        }
    }
    else {
        return false;
    }
};

EventEmitter.prototype.emit(type, payload)

• type string - the type of event to emit
• payload ...(object,number,string) - Any additional arguments will be sent to the handlers for this event

Triggers an event of a specific type, with any additional payload passed.

EventEmitter.prototype.emit = function (type) {
    var payload = Array.prototype.slice.call(arguments, 1),
        fns = this.listeners[type] || [],
        i;
 
    for(i=0; i<fns.length; i++) {
        fns[i](payload);
    }
};
 
module.exports = EventEmitter;
},{}]},{},[1])