Changes for iOS Chrome and angle detection

README.md

@@ -1,16 +1,15 @@
 A fix for the iOS orientationchange zoom bug.
 =======================
 
-Authored by @scottjehl, rebounded by @wilto.
+Authored by @scottjehl, rebounded by @wilto. Updated By @peterwooster
 MIT / GPLv2 License.
 
 Demo: http://scottjehl.github.com/iOS-Orientationchange-Fix/
 
-Minified src:
-
-	/*! A fix for the iOS orientationchange zoom bug. Script by @scottjehl, rebound by @wilto.MIT / GPLv2 License.*/(function(a){function m(){d.setAttribute("content",g),h=!0}function n(){d.setAttribute("content",f),h=!1}function o(b){l=b.accelerationIncludingGravity,i=Math.abs(l.x),j=Math.abs(l.y),k=Math.abs(l.z),(!a.orientation||a.orientation===180)&&(i>7||(k>6&&j<8||k<8&&j>6)&&i>5)?h&&n():h||m()}var b=navigator.userAgent;if(!(/iPhone|iPad|iPod/.test(navigator.platform)&&/OS [1-5]_[0-9_]* like Mac OS X/i.test(b)&&b.indexOf("AppleWebKit")>-1))return;var c=a.document;if(!c.querySelector)return;var d=c.querySelector("meta[name=viewport]"),e=d&&d.getAttribute("content"),f=e+",maximum-scale=1",g=e+",maximum-scale=10",h=!0,i,j,k,l;if(!d)return;a.addEventListener("orientationchange",m,!1),a.addEventListener("devicemotion",o,!1)})(this);	
 Instructions: 
-Include the script, enable your zooms. (I'll fill that out more later...).
+Include the script, enable your zooms by setting the meta viewport
+
+    <meta name="viewport" id="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0,maximum-scale=10.0" />
 
 How it works:
 This fix works by listening to the device's accelerometer to predict when an orientation change is about to occur. When it deems an orientation change imminent, the script disables user zooming, allowing the orientation change to occur properly, with zooming disabled. The script restores zoom again once the device is either oriented close to upright, or after its orientation has changed. This way, user zooming is never disabled while the page is in use.

ios-orientationchange-fix.js

@@ -1,28 +1,30 @@
 /*! A fix for the iOS orientationchange zoom bug.
- Script by @scottjehl, rebound by @wilto.
+ Script by @scottjehl, rebound by @wilto, modified by Peter Wooster.
  MIT / GPLv2 License.
 */
+
 (function(w){
 
-	// This fix addresses an iOS bug, so return early if the UA claims it's something else.
+	// This fix addresses an Mobile Safari iOS bug, so return early if the UA claims it's something else.
 	var ua = navigator.userAgent;
-	if( !( /iPhone|iPad|iPod/.test( navigator.platform ) && /OS [1-5]_[0-9_]* like Mac OS X/i.test(ua) && ua.indexOf( "AppleWebKit" ) > -1 ) ){
+	if( !( /iPhone|iPad|iPod/.test( navigator.platform ) 
+            && /OS [1-5]_[0-9_]* like Mac OS X/i.test(ua) 
+            && ua.indexOf( "AppleWebKit" ) > -1
+            && ua.indexOf( "CriOS") == -1  // chrome for iOS doesn't have the bug
+            )){
 		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;
-
+    var meta = doc.querySelector( "meta[name=viewport]" );
     if( !meta ){ return; }
-
+    var initialContent = meta && meta.getAttribute( "content" );
+    var disabledZoom = initialContent + ",maximum-scale=1";
+    var enabledZoom = initialContent + ",maximum-scale=10";
+    var enabled = true;
+    var	x, y, z, aig;
     function restoreZoom(){
         meta.setAttribute( "content", enabledZoom );
         enabled = true;
@@ -34,23 +36,24 @@
     }
 
     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 || w.orientation === 180) && ( x > 7 || ( ( z > 6 && y < 8 || z < 8 && y > 6 ) && x > 5 ) ) ){
-			if( enabled ){
-				disableZoom();
-			}        	
-        }
-		else if( !enabled ){
-			restoreZoom();
-        }
+        var ori = w.orientation;
+        // if it's landscape we're out of here
+        if(90 == Math.abs(w.orientation)) {
+            if(enabled)restoreZoom();
+            return;
+        } 
+
+	aig = e.accelerationIncludingGravity;
+	x = Math.abs( aig.x );
+	y = Math.abs( aig.y );
+
+        // If in the danger zone where x is much greater than y turn off zoom
+        if(y == 0 || (x/y) > 1.2){
+            if(enabled)disableZoom();
+        }else if( !enabled )restoreZoom();
     }
 
-	w.addEventListener( "orientationchange", restoreZoom, false );
-	w.addEventListener( "devicemotion", checkTilt, false );
+    w.addEventListener( "orientationchange", restoreZoom, false );
+    w.addEventListener( "devicemotion", checkTilt, false );
 
-})( this );
+})( this );