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Javascript singleton pattern
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| (function(win, $) { | |
| var CircleGeneratorSingleton = (function() { | |
| var instance; | |
| function init() { | |
| var _aCircle = [], | |
| _stage = $('.advert'); | |
| function _position(circle, left, top) { | |
| circle.css('left', left); | |
| circle.css('top', top); | |
| } | |
| function create(left, top) { | |
| var circle = $('<div class=\"circle\"></div>'); | |
| _position(circle, left, top); | |
| return circle; | |
| } | |
| function add(circle) { | |
| _stage.append(circle); | |
| _aCircle.push(circle); | |
| } | |
| function index() { | |
| return _aCircle.length; | |
| } | |
| return {index: index, | |
| create: create, | |
| add: add}; | |
| } | |
| return { | |
| getInstance: function() { | |
| if (!instance) { | |
| instance = init(); | |
| } | |
| return instance; | |
| } | |
| } | |
| })(); | |
| $(win.document).ready(function() { | |
| $('.advert').click(function(e) { | |
| var cg = CircleGeneratorSingleton.getInstance(); | |
| var circle = cg.create(e.pageX, e.pageY); | |
| cg.add(circle); | |
| }); | |
| $(document).keypress(function(e) { | |
| if (e.key == 'a') { | |
| var cg = CircleGeneratorSingleton.getInstance(); | |
| var circle = cg.create(Math.floor(Math.random()* 600), Math.floor(Math.random()* 600)); | |
| cg.add(circle); | |
| } | |
| }); | |
| }); | |
| })(window, jQuery); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="keywords" content="design patterns"> | |
| <title>Mastering Javascript</title> | |
| <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> | |
| <style type="text/css" media="screen"> | |
| .circle { | |
| position: relative; | |
| border-radius: 50%; | |
| width: 50px; | |
| height: 50px; | |
| background-color: red; | |
| } | |
| </style> | |
| <script src="http://code.jquery.com/jquery-1.11.3.min.js"></script> | |
| <script src="circleGeneratorSingleton.js"></script> | |
| </head> | |
| <body> | |
| <h1>Circles</h1> | |
| <h3>[Singleton Design Pattern]</h3> | |
| <div class="container"> | |
| <div class="advert"> | |
| Press 'a' or click here to generate new circle. | |
| </div> | |
| </div> | |
| </body> | |
| </html> |
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