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jsPattern.PubSubImpl - one compact library-agnostic implementation by addyosmani. Purely for learning purpose.
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/*! | |
* Pub/Sub implementation | |
* http://addyosmani.com/ | |
* Licensed under the GPL | |
* http://jsfiddle.net/LxPrq/ | |
*/ | |
;(function ( window, doc, undef ) { | |
var topics = {}, | |
subUid = -1, | |
pubsubz ={}; | |
pubsubz.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; | |
}; | |
pubsubz.subscribe = function ( topic, func ) { | |
if (!topics[topic]) { | |
topics[topic] = []; | |
} | |
var token = (++subUid).toString(); | |
topics[topic].push({ | |
token: token, | |
func: func | |
}); | |
return token; | |
}; | |
pubsubz.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; | |
}; | |
getPubSubz = function(){ | |
return pubsubz; | |
}; | |
window.pubsubz = getPubSubz(); | |
}( this, this.document )); |
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