Revision: 63612
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at May 22, 2013 04:48 by bitsculptor
Initial Code
/*! A fix for the iOS orientationchange zoom bug.
Script by @scottjehl, rebound by @wilto.
MIT License.
*/
(function(w){
// This fix addresses an iOS bug, so return early if the UA claims it's something else.
if( !( /iPhone|iPad|iPod/.test( navigator.platform ) && navigator.userAgent.indexOf( "AppleWebKit" ) > -1 ) ){ return; }
var doc = w.document;
if( !doc.querySelector ){ return; }
var meta = doc.querySelector( "meta[name=viewport]" ),
initialContent = meta && meta.getAttribute( "content" ),
disabledZoom = initialContent + ",maximum-scale=1",
enabledZoom = initialContent + ",maximum-scale=10",
enabled = true,
x, y, z, aig;
if( !meta ){ return; }
function restoreZoom(){
meta.setAttribute( "content", enabledZoom );
enabled = true; }
function disableZoom(){
meta.setAttribute( "content", disabledZoom );
enabled = false; }
function checkTilt( e ){
aig = e.accelerationIncludingGravity;
x = Math.abs( aig.x );
y = Math.abs( aig.y );
z = Math.abs( aig.z );
// If portrait orientation and in one of the danger zones
if( !w.orientation && ( x > 7 || ( ( z > 6 && y < 8 || z < 8 && y > 6 ) && x > 5 ) ) ){
if( enabled ){ disableZoom(); } }
else if( !enabled ){ restoreZoom(); } }
w.addEventListener( "orientationchange", restoreZoom, false );
w.addEventListener( "devicemotion", checkTilt, false );
})( this );
Initial URL
Initial Description
This is a simple fix for the iOS zoom bug that happens when changing screen orientations.
Initial Title
iOS orientation change zoom bug fix
Initial Tags
javascript, ios
Initial Language
JavaScript