Created
April 4, 2011 08:30
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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)); |
I don't think this works any more (iOS 10+) due to Apple now ignoring the scale meta tags
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I tested this code and its working well. thanks for sharing.