-
-
Save filippo/6568938 to your computer and use it in GitHub Desktop.
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
/* See also: "Learning Javascript Design Patterns" by Addy Osmani | |
* http://addyosmani.com/resources/essentialjsdesignpatterns/book/ | |
* | |
* for examples on how to use pubsub as event aggregator (Mediator) | |
* | |
*/ | |
var pubsub = {}; | |
(function(q) { | |
var topics = {}, subUid = -1; | |
q.subscribe = function(topic, func) { | |
if (!topics[topic]) { | |
topics[topic] = []; | |
} | |
var token = (++subUid).toString(); | |
topics[topic].push({ | |
token: token, | |
func: func | |
}); | |
return token; | |
}; | |
q.publish = function(topic, args) { | |
if (!topics[topic]) { | |
return false; | |
} | |
setTimeout(function() { | |
var subscribers = topics[topic], | |
len = subscribers ? subscribers.length : 0; | |
while (len--) { | |
subscribers[len].func(topic, args); | |
} | |
}, 0); | |
return true; | |
}; | |
q.unsubscribe = function(token) { | |
for (var m in topics) { | |
if (topics[m]) { | |
for (var i = 0, j = topics[m].length; i < j; i++) { | |
if (topics[m][i].token === token) { | |
topics[m].splice(i, 1); | |
return token; | |
} | |
} | |
} | |
} | |
return false; | |
}; | |
}(pubsub)); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment