Created
February 28, 2012 00:39
-
-
Save dharFr/1928176 to your computer and use it in GitHub Desktop.
jQuery based observer pattern
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
| ;(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); |
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
| <!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> |
Is there a way to use this to allow observers alter data? as opposed to just fire off functions that are subscribed to an event?
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Very useful! I wanted to add a suggestion. For the plugin system im using, in PHP, you would do something like...
add_action('asset.add.success', 'my_function');
or
add_action('asset.add.error', 'my_function');
and if you wanted to have my_function() execute on both success AND error, you could just..
add_action('asset.add', 'my_function');
and it would execute on asset.add.*, do you think theres a way to do that with your jQuery plugin? Or can you make it do that? :-D