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| /* | |
| * matchMedia() polyfill - test whether a CSS media type or media query applies | |
| * authors: Scott Jehl, Paul Irish, Nicholas Zakas | |
| * Copyright (c) 2010 Filament Group, Inc | |
| * MIT license | |
| * dev.w3.org/csswg/cssom-view/#dom-window-matchmedia | |
| * in Chrome since m10: http://trac.webkit.org/changeset/72552 | |
| */ | |
| window.matchMedia = window.matchMedia || (function(doc, undefined){ | |
| var bool, | |
| docElem = doc.documentElement, | |
| refNode = docElem.firstElementChild || docElem.firstChild, | |
| // fakeBody required for <FF4 when executed in <head> | |
| fakeBody = doc.createElement('body'), | |
| div = doc.createElement('div'); | |
| div.id = 'mq-test-1'; | |
| div.style.cssText = "position:absolute;top:-100em"; | |
| fakeBody.appendChild(div); | |
| return function(q){ | |
| div.innerHTML = '_<style media="'+q+'"> #mq-test-1 { width: 42px; }</style>'; | |
| docElem.insertBefore(fakeBody, refNode); | |
| div.removeChild(div.firstChild); | |
| bool = div.offsetWidth == 42; | |
| docElem.removeChild(fakeBody); | |
| return { matches: bool, media: q }; | |
| }; | |
| })(document); | |
| /* | |
| * EXAMPLE USAGE | |
| */ | |
| // test 'tv' media type | |
| if (matchMedia('tv').matches) { | |
| // tv media type supported | |
| } | |
| // test a mobile device media query | |
| if (matchMedia('only screen and (max-width: 480px)').matches) { | |
| // smartphone/iphone... maybe run some small-screen related dom scripting? | |
| } | |
| // test landscape orientation | |
| if (matchMedia('all and (orientation:landscape)').matches) { | |
| // probably tablet in widescreen view | |
| } | |