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kevingessner/parent.htm

Created May 17, 2013 13:09
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Detect browser zoom in javascript 'zoom' event is triggered on window on every browser zoom change. No polling!
Raw
parent.htm
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
</head>
<body>
<iframe id="frame" style="width: 250px; border: solid 1px red;" ></iframe>
<script type="text/javascript">
var elFrame = $('#frame')[0];
$(elFrame.contentWindow).resize(function() {
$(window).trigger('zoom');
});
$(window).on('zoom', function() {
console.log('zoom', window.devicePixelRatio);
});
</script>
</body>
</html>
@iHateRa1n
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i spend all of this time working on zoom bullshit, and NOW i find this.

WHY

@amit777
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amit777 commented Feb 19, 2019

Hi, neat solution. This method detects when you use the keyboard "command + shift + plus" or with the menu bar. However, if I pinch zoom, for some reason the zoom event doesn't trigger.. any tips on how to catch this case as well?

@R2D221
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R2D221 commented Jul 17, 2020

@amit777 For pinch zoom you need the Visual Viewport API.

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