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JavaScript closures illustrated
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| <html> | |
| <head> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> | |
| <script src='javascript.js'></script> | |
| <link href="style.css" media="all" rel="stylesheet" type="text/css"> | |
| </head> | |
| <body> | |
| <h1> | |
| JavaScript Closures Illustrated | |
| </h1> | |
| <h3>Normal Loop</h3> | |
| <div class='normal-loop'> | |
| <button>1</button> | |
| <button>2</button> | |
| <button>3</button> | |
| <button>4</button> | |
| <button>5</button> | |
| <button>6</button> | |
| <button>7</button> | |
| <button>8</button> | |
| <button>9</button> | |
| <button>10</button> | |
| </div> | |
| <br><hr><br> | |
| <h3>Closure Loop</h3> | |
| <div class='closure-loop'> | |
| <button>1</button> | |
| <button>2</button> | |
| <button>3</button> | |
| <button>4</button> | |
| <button>5</button> | |
| <button>6</button> | |
| <button>7</button> | |
| <button>8</button> | |
| <button>9</button> | |
| <button>10</button> | |
| </div> | |
| <footer> | |
| Inspired by Mark Dalgleish's excellent talk <a href='http://markdalgleish.com/presentations/gettingclosure/'>"Getting Closure"</a><br><br> | |
| Paul Wittmann - <a href='https://twitter.com/wakkahari'>@wakkahari</a> - <a href='mailto:[email protected]'>[email protected]</a> | |
| </footer | |
| </body> | |
| </html> |
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| $(function() { | |
| // normal loop | |
| for(var i = 0; i < 10; i++) { | |
| $element = $('.normal-loop button').eq(i); | |
| $element.click(function() { | |
| alert('You clicked on button #' + (i+1)); | |
| }); | |
| } | |
| // loop using closures - thus emulating block scope (cf. http://markdalgleish.com/presentations/gettingclosure) | |
| for(var j = 0; j < 10; j++) { | |
| (function(j) { | |
| $element = $('.closure-loop button').eq(j); | |
| $element.click(function() { | |
| alert('You clicked on button #' + (j + 1)); | |
| }); | |
| })(j); | |
| } | |
| }); |
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| body { | |
| font-family: 'Helvetica Neue', Helvetica, Arial; | |
| } | |
| .normal-loop, .closure-loop { | |
| padding: 20px; | |
| } | |
| .normal-loop { | |
| background: red; | |
| } | |
| .closure-loop { | |
| background: green; | |
| } | |
| button { | |
| font-size: 18px | |
| } | |
| footer { | |
| margin-top: 50px; | |
| font-size: 16px; | |
| } |
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