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jQuery Counter
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>jQuery Counter</title> | |
| </head> | |
| <body> | |
| <!-- declarative markup --> | |
| <div class="my-counter"> | |
| <h1>Counter: <span class="counter-output"></span></h1> | |
| <button type="button" data-increment="-1">subtract 1</button> | |
| <button type="button" data-increment="1">add 1</button> | |
| </div> | |
| <!-- with custom markup --> | |
| <p class="my-counter"> | |
| <strong class="counter-output"></strong> counted! | |
| <a href="#" data-increment="-10">subtract 10</a> | |
| <a href="#" data-increment="5">add 5</a> | |
| </p> | |
| <script src="http://code.jquery.com/jquery.min.js"></script> | |
| <script src="js/components/counter.js"></script> | |
| </body> | |
| </html> |
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| $(function () { | |
| 'use strict'; | |
| $('.my-counter').each(function ( index, element ) { | |
| var count = 0; | |
| var $component = $(element); | |
| var $output = $component.find('.counter-output'); | |
| var updateCount = function( increment ) { | |
| count += increment; | |
| count = count < 0 ? 0 : count; | |
| $output.text(count); | |
| }; | |
| $component.on('click', '[data-increment]', function ( event ) { | |
| var increment = $(event.target).data('increment'); | |
| updateCount(+increment); | |
| }); | |
| updateCount( count ); //initial state | |
| }); | |
| }); |
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