My mobile site uses ajax to load pages, and I'm looking to implement a feature that resets the zoom level when a page changes.
Is there an effective way to detect if a user has zoomed the view while browsing a page?
Currently, I have been able to check for pinch zooming, but I also need to account for double tap zooming as well..
To determine the user's zoom level, you can compare the innerWidth and document width. The document width represents the width of the device in pixels, while the inner width is the number of pixels on screen relative to the original document width when zoomed. I have successfully tested this technique on Android (ICS and Jellybean) as well as iOS (5 and 6). It's worth noting that my viewport is not set to device width or height.
ratio = document.width / window.innerWidth
if ratio > 1 then zoomed else notZoomed
You can perform this check whenever a user double taps or pinches the screen.
It's possible to manipulate the [meta name="viewport"] tag with javascript to adjust the zoom level, but I haven't come across a method to determine the current zoom level.
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