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mislav/zoom.js

Created April 4, 2010 19:07
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Detect zoom factor on Mobile Safari
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zoom.js
/* tested on the iPad and iPhone */
function getZoomFactor() {
var deviceWidth, landscape = Math.abs(window.orientation) == 90
// workaround for strange screen.height on the iPhone (v3.1.3)
if (window.screen.width == 320) deviceWidth = landscape ? 480 : 320
else deviceWidth = window.screen[landscape ? "height" : "width"]
return deviceWidth / window.innerWidth
}
@gjcourt
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gjcourt commented Oct 29, 2010

another way to do this http://gist.github.com/653079

@mislav
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mislav commented Oct 29, 2010

wow! that looks much simpler

@yairEO
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yairEO commented Sep 2, 2017

what are those magic numbers 480 & 320... seems suspiciously magical.

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