Forked from mathiasbynens/ios-viewport-scaling-bug-fix-original.js
Created
July 16, 2012 16:36
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Improved version of JavaScript fix for the iOS viewport scaling bug. See http://www.blog.highub.com/mobile-2/a-fix-for-iphone-viewport-scale-bug/
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// Original code from http://www.blog.highub.com/mobile-2/a-fix-for-iphone-viewport-scale-bug/ | |
var metas = document.getElementsByTagName('meta'); | |
var i; | |
if (navigator.userAgent.match(/iPhone/i)) { | |
for (i=0; i<metas.length; i++) { | |
if (metas[i].name == "viewport") { | |
metas[i].content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0"; | |
} | |
} | |
document.getElementsByTagName('body')[0].addEventListener("gesturestart", gestureStart, false); | |
} | |
function gestureStart() { | |
for (i=0; i<metas.length; i++) { | |
if (metas[i].name == "viewport") { | |
metas[i].content = "width=device-width, minimum-scale=0.25, maximum-scale=1.6"; | |
} | |
} | |
} |
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// Rewritten version | |
// By @mathias, @cheeaun and @jdalton | |
(function(doc) { | |
var addEvent = 'addEventListener', | |
type = 'gesturestart', | |
qsa = 'querySelectorAll', | |
scales = [1, 1], | |
meta = qsa in doc ? doc[qsa]('meta[name=viewport]') : []; | |
function fix() { | |
meta.content = 'width=device-width,minimum-scale=' + scales[0] + ',maximum-scale=' + scales[1]; | |
doc.removeEventListener(type, fix, true); | |
} | |
if ((meta = meta[meta.length - 1]) && addEvent in doc) { | |
fix(); | |
scales = [.25, 1.6]; | |
doc[addEvent](type, fix, true); | |
} | |
}(document)); |
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