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Mobile Safari fixed positioning fix #1

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Mobile Safari fixed positioning fix #1

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35 changes: 20 additions & 15 deletions feature_tests.js
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Original file line number Diff line number Diff line change
Expand Up @@ -158,21 +158,26 @@ SOFTWARE.

features.IS_POSITION_FIXED_SUPPORTED = (features.__IS_POSITION_FIXED_SUPPORTED = function(){
var isSupported = null;
if (document.createElement) {
var el = document.createElement('div');
if (el && el.style) {
el.style.position = 'fixed';
el.style.top = '10px';
var root = document.body;
if (root &&
root.appendChild &&
root.removeChild) {
root.appendChild(el);
isSupported = (el.offsetTop === 10);
root.removeChild(el);
}
}
}
var container = document.body;
if (document.createElement && container && container.appendChild && container.removeChild) {
var el = document.createElement("div");
if (!el.getBoundingClientRect) {
return null;
}
el.innerHTML = "x";
el.style.cssText = "position:fixed;top:100px;-webkit-overflow-scrolling:touch;";
container.appendChild(el);
var originalHeight = container.style.height, originalScrollTop = container.scrollTop;
container.style.height = "3000px";
container.scrollTop = 500;
var elementTop = el.getBoundingClientRect().top;
var isSupported = ((container.scrollTop === 500 && elementTop === 100) || // most modern browsers
el.style.cssText.indexOf('scrolling') != -1); // ios 5

container.removeChild(el);
container.style.height = originalHeight;
container.scrollTop = originalScrollTop;
}
return isSupported;
})();

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64 changes: 64 additions & 0 deletions fixedtest.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,64 @@
<!doctype html>
<html>
<body>
<h1>Position Fixed Test</h1> (http://kangax.github.com/cft/#IS_POSITION_FIXED_SUPPORTED)
<script>
function detectFixedPosition(){
var container = document.body;

if (document.createElement && container && container.appendChild && container.removeChild) {
var el = document.createElement('div');

if (!el.getBoundingClientRect) return null;

el.innerHTML = 'x';
el.style.cssText = 'position:fixed;top:100px;';
container.appendChild(el);

var originalHeight = container.style.height,
originalScrollTop = container.scrollTop;

container.style.height = '3000px';
container.scrollTop = 500;

var elementTop = el.getBoundingClientRect().top;
container.style.height = originalHeight;

var isSupported = (elementTop === 100);
container.removeChild(el);
container.scrollTop = originalScrollTop;

return isSupported;
}
return null;
}
function detectFixedPositionFixed(){
var isSupported = null;
var container = document.body;
if (document.createElement &&
container && container.appendChild && container.removeChild) {
var el = document.createElement("div");
if (!el.getBoundingClientRect) {
return null;
}
el.innerHTML = "x";
el.style.cssText = "position:fixed;top:100px;-webkit-overflow-scrolling:touch;";
container.appendChild(el);
var originalHeight = container.style.height, originalScrollTop = container.scrollTop;
container.style.height = "3000px";
container.scrollTop = 500; // won't work on mobile safari
var elementTop = el.getBoundingClientRect().top;
isSupported = ((container.scrollTop === 500 && elementTop === 100) || // most modern browsers
el.style.cssText.indexOf('scrolling') != -1); // ios 5 beta
// alert(elementTop);
container.removeChild(el);
container.style.height = originalHeight;
container.scrollTop = originalScrollTop;
}
return isSupported;
}
alert(detectFixedPositionFixed());
</script>
</body>
</html>