Created
June 16, 2012 19:59
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Simple Javascript Event Delegation
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| <html> | |
| <head> | |
| <title>Subscriber Test Page</title> | |
| <link rel="stylesheet" type="text/css" href="http://yui.yahooapis.com/2.8.0r4/build/reset-fonts-grids/reset-fonts-grids.css"> | |
| <style type="text/css" media="screen"> | |
| body { | |
| font-family: Myriad Pro, Helvetica, Arial; | |
| font-size:138.5%; | |
| } | |
| h1 { | |
| font-size:197%; | |
| } | |
| .container { | |
| width:75%; | |
| margin:2em auto; | |
| background-color:#EEE; | |
| border:1px solid #CCC; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>Demo / Test page for Subscriber: Look at your console.</h1> | |
| <script type="text/javascript"> | |
| var Subscriber = function () { | |
| this.events = {}; | |
| }; | |
| Subscriber.prototype.create = function (event) { | |
| if (this.events[event]) { | |
| return; | |
| } | |
| this.events[event] = []; | |
| return; | |
| }; | |
| Subscriber.prototype.subscribe = function (event, callback, scope) { | |
| if (!this.events[event]) { return; } | |
| this.events[event].push({ | |
| callback: callback, | |
| scope: scope | |
| }); | |
| }; | |
| Subscriber.prototype.trigger = function (event, data) { | |
| if (!this.events[event]) { return; } | |
| var i, | |
| callback, | |
| scope, | |
| output; | |
| for (i in this.events[event]) { | |
| callback = this.events[event][i].callback; | |
| scope = this.events[event][i].scope; | |
| if (!scope) { | |
| output = callback(data); | |
| } else { | |
| output = callback.apply(scope, [data]); | |
| } | |
| } | |
| return; | |
| }; | |
| (function () { | |
| var scope, data; | |
| var mySubscriber = new Subscriber(); | |
| var myCallback = function () { | |
| console.log("Test 1"); | |
| }; | |
| mySubscriber.create("testing"); | |
| mySubscriber.subscribe("testing", myCallback); | |
| mySubscriber.trigger("testing"); | |
| var mySecondCallback = function () { | |
| console.log(this.message); | |
| }; | |
| scope = { | |
| message: "Test 2" | |
| }; | |
| mySubscriber.create("testing2"); | |
| mySubscriber.subscribe("testing2", mySecondCallback, scope); | |
| mySubscriber.trigger("testing2"); | |
| var myThirdCallback = function (data) { | |
| console.log("scope", this.message, "data", data.message); | |
| }; | |
| scope = { | |
| message: "Test 3" | |
| }; | |
| data = { | |
| message: "Test 3 data" | |
| }; | |
| mySubscriber.create("testing3"); | |
| mySubscriber.subscribe("testing3", myThirdCallback, scope); | |
| mySubscriber.trigger("testing3", data); | |
| }()); | |
| </script> | |
| </body> | |
| </html> |
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