A simple way of detecting changes in currently active breakpoint, as well as executing breakpoint-specific JavaScript code.
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A Pen by Maciej Gurban.
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <meta http-equiv="X-UA-Compatible" content=="IE=edge"/> | |
| <meta name=viewport content="width=device-width, initial-scale=1"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"/> | |
| <title>How to detect breakpoints in Twitter Bootstrap using JavaScript (and execute custom code whenever active breakpoint changes)</title> | |
| <link rel="stylesheet" type="text/css" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet"/> | |
| </head> | |
| <body> | |
| <div class="example-wrapper"> | |
| <div class="container"> | |
| <div class="row"> | |
| <div class="col-xs-12 col-sm-12 col-md-12 col-lg-12"> | |
| <h4><strong>How to detect breakpoints in Twitter Bootstrap using JavaScript </strong></h4> | |
| (and execute custom code whenever active breakpoint changes)<br/><br/> | |
| <p>In this example <em>active breakpoint</em> box will increase its width using JavaScript function whenever the smallest (xs) breakpoint is detected.</p> | |
| <p>Resize your browser's width to see it working</p> | |
| <p>Active breakpoint: <div class="breakpoint-alias"></div></p> | |
| </div> | |
| </div> | |
| </div> | |
| <!-- mandatory --> | |
| <div class="device-xs visible-xs"></div> | |
| <div class="device-sm visible-sm"></div> | |
| <div class="device-md visible-md"></div> | |
| <div class="device-lg visible-lg"></div> | |
| <!-- end mandatory --> | |
| </div> | |
| </body> | |
| </html> |
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| (function($){ | |
| /* | |
| * A lightweight window resize listener | |
| */ | |
| var waitForFinalEvent = function(){var b={};return function(c,d,a){a||(a="I'm a banana!");b[a]&&clearTimeout(b[a]);b[a]=setTimeout(c,d)}}(); | |
| /* | |
| * @returns | |
| * true - if page is currently using the breakpoint specified as argument | |
| * false - if otherwise | |
| */ | |
| function isBreakpoint( alias ) { | |
| return $('.device-' + alias).is(':visible'); | |
| } | |
| /* | |
| * Main window resize listener | |
| * Executes each time window has been resized | |
| */ | |
| $(window).resize(function () { | |
| waitForFinalEvent(function(){ | |
| if (isBreakpoint('xs')) { | |
| $('.breakpoint-alias').animate({'width': '150px'}, 300); | |
| } else { | |
| $('.breakpoint-alias').animate({'width': '50px'}, 300); | |
| } | |
| }, 300, new Date().getTime()) | |
| }); | |
| })(jQuery); |
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| /* | |
| * None of the CSS in this example is necessary for the script to work properly. The only required CSS is the one shipped with Bootstrap. | |
| */ | |
| /* This example's styling */ | |
| .breakpoint-alias { | |
| display: inline-block; | |
| padding: 6px 12px; | |
| color: #fff; | |
| background-color: #238cce; | |
| width: 50px; | |
| text-align: center; | |
| } | |
| h4 { | |
| margin-bottom: 0!important; | |
| } | |
| @media (max-width: 767px) { | |
| .breakpoint-alias:before { | |
| content: 'XS '; | |
| } | |
| } | |
| @media (min-width: 768px) and (max-width: 983px) { | |
| .breakpoint-alias:before { | |
| content: 'SM '; | |
| } | |
| } | |
| @media (min-width: 984px) and (max-width: 1199px) { | |
| .breakpoint-alias:before { | |
| content: 'MD '; | |
| } | |
| } | |
| @media (min-width: 1200px) { | |
| .breakpoint-alias:before { | |
| content: 'LG '; | |
| } | |
| } |
@leolux http://stackoverflow.com/questions/2854407/javascript-jquery-window-resize-how-to-fire-after-the-resize-is-completed/4541963#4541963
It's not a resize listener. It's a timer
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Why do we need this akward looking window resize listener?