This is a small, vanilla JS library to make an DOM object zoomable via a pinch gesture. It will only scale the given object and not influence any other DOM object. It keeps all other browser default behaviour.
It was made to work around the missing position: device-fixed as proposed by
PPK. The
demo shows how it can be used to
create a device fixed header, while still having a scrollable and zoomable content area.
The PinchZoom function expects a DOM object as a first parameter - that node needs to be in a scrollable container. That can be the document body itself (like in the demo) or any other DOM node. Be sure to explicitly set ''overflow: auto'' on that node or you will have problems in iOS 9!
Your document should disable all Browser zooming gestures:
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>A second parameter is optional you can use it to set the minimum and maximum scale:
PinchZoom(document.getElementById('content', {minScale: 0.5, maxScale: 3}); You can also set a debug function which will be passed the internal input object - to see what the current state
is. See the demo for an example.
Copyright (c) 2016 Andreas Gohr, CosmoCode GmbH [email protected]
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