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jQuery based observer pattern
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| ;(function($) { | |
| /* | |
| * jQuery Observer pattern | |
| * inspired by @addyosmani 's code | |
| * see: http://addyosmani.com/resources/essentialjsdesignpatterns/book/#highlighter_506612 | |
| */ | |
| var topics = []; | |
| function getTopic(id) { | |
| var callbacks; | |
| topic = id && topics[id]; | |
| if (!topic) { | |
| callbacks = $.Callbacks(); | |
| topic = { | |
| publish: callbacks.fire, | |
| subscribe: callbacks.add, | |
| unsubscribe: callbacks.remove | |
| }; | |
| if (id) topics[id] = topic; | |
| } | |
| return topic; | |
| } | |
| $.observer = { | |
| publish: function(id) { | |
| var args = (2 <= arguments.length) ? Array.prototype.slice.call(arguments, 1) : []; | |
| var t = getTopic(id); | |
| return t.publish.apply(t, args); | |
| }, | |
| subscribe: function(id, fn) { | |
| return getTopic(id).subscribe(fn); | |
| }, | |
| unsubscribe: function(id, fn) { | |
| return getTopic(id).unsubscribe(fn); | |
| } | |
| }; | |
| })(jQuery); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>jQuery Observer Pattern Sample</title> | |
| </head> | |
| <body> | |
| <p>Outputs to console...</p> | |
| <script src="http://code.jquery.com/jquery-1.7.1.min.js"></script> | |
| <script src="jquery.observer.js"></script> | |
| <script> | |
| function fn1() { console.log('fn1 called', arguments); } | |
| function fn2() { console.log('fn2 called', arguments); } | |
| function fn3() { console.log('fn3 called', arguments); } | |
| function publish() { | |
| var args = (1 <= arguments.length) ? Array.prototype.slice.call(arguments, 0) : []; | |
| console.group('publish ' + args[0]); | |
| $.observer.publish.apply($.observer, args); | |
| console.groupEnd(); | |
| } | |
| $.observer.subscribe('test1', fn1); | |
| $.observer.subscribe('test1', fn2); | |
| $.observer.subscribe('test2', fn3); | |
| publish('test1', 'strArg1', 'strArg2'); | |
| publish('test2', 1, 2, '3'); | |
| $.observer.unsubscribe('test1', fn2); | |
| publish('test1', {key1: 'val1', key2: 'val2'}); | |
| publish('test2'); | |
| $.observer.unsubscribe('test1', fn1); | |
| publish('test1'); | |
| publish('test2'); | |
| </script> | |
| </body> | |
| </html> |
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