Mobile browser: zoom after orientation change - javascript

I'm developing one-page site (webapp in fact). When I tested it on a mobile device, I noticed that mobile browsers change zoom lvl after orientation change. Unfortunately I can't just set user-scalable to 0. Is any other way to get rid of this problem? I think maybe I can do my own zoom mechanizm via HammerJS, and then set user-scalable to 0, but it work slow and jerky... Any idea, how resolve this?
P.S.
I use AngularJS as my framework, and HammerJS to manipulate other touch events

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How to detect Android Split Screen Resizing from Web View?

We are working on a webpage that is currently having issues with split screen resizing.
When we change the orientation of the page on a mobile browser or do a window resize on a desktop browser, we are able to run the required updates fine because we listen to the resize and orientationchange events that get fired with either type of event.
However, we just realized that with split screen on Android (and possibly split screen on iOS tablets), we aren't triggering any resize events for the window and therefore can't do proper updating of our elements based on the split screen being activated or updated (when the user moves the split).
Is this something we can work around or am I just completely missing some functionality that I should be using?
I have looked around online and haven't found anything related so far that I could use from our JS.
Thanks! Any pointers would be greatly appreciated.
Information about Multi-Window Feature in Android - doesn't go over any possible ways to detect it from a web view though, but looks at it from an Android app dev perspective

What javascript framework is google images using for pinch zoom?

Google has now implemented a very unique pinch zoom for their images. The viewport meta tag does not allow user scaling or zooming, and as you would expect the resulting content is not pinch-zoomable on a mobile touch device. The image, however, is pinch zoomable. The image is the only part of the page that zooms, and the viewport scaling never changes. Does anyone know what javascript framework they are using to accomplish this? Is it publicly available?
I don't think their version is opensource, however this library is pretty nice:
https://openseadragon.github.io/
Not sure what google uses but there is a jQuery library that does this. It's called
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How to avoid swipe scrolling and double tap zooming on android 2.3.6 stock browser?

I have this tetris game I programmed with the intention of learning a bit more on javascript: elcodedocle.github.io/tetrominos
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Zoom events are not exactly canceled by user-scalable=no viewport property: double click and two-finger zooming still work. Sometimes.
The canvas freezes, also sometimes (I'm going mad trying to determine the cause: How the heck you debug a web app running on an android browser??). I'm guessing because of a swipe or drag event triggered that shouldn't be, so it's somehow related to the above. Tapping out of the canvas makes it work again.
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Any suggestions/ideas?
the problem is with the device's processing speed.. evrery device has its own processing speed. canvas animations are based on javascript's setInterval and setTimeout methods..which performs as per the device's processing speed..thats why canvas games are sometimes laggy on handhelds.

Reset / change zoom via javascript on Mobile Safari Web App

This issue has been discussed here before, however, I don't get the suggested solution to work.
I want to change the scale / zoom of a webpage on a mobile safari via JS. The solution suggested by
How can I use JavaScript to set the zoom level on mobile safari?
Mobile Safari Web App Zoom issue
Is is possible to change page zoom in Mobile Safari via Javascript?
is to set the "viewport" meta tag.
I tried this, but the scale is not changed.
$('meta[name="viewport"]').attr('content', 'width=device-width, user-scalable:no');
When does safari interpret the viewport setting? Only when loading a page or also when the value is changed programmatically (what I would expect with repsect to the answers of the questions mentioned above)?
Did this behaviour change in some iOS version?
BTW: Where can a find a list of recognized arguments for viewport?
Many thanks for any suggestion!

Sencha Touch do not set scale and allow scrolling and resize on iPhone or iPad

I am playing around with Sencha Touch, especially with examples like http://dev.sencha.com/deploy/touch/examples/
However I am faced with a problem, when using the component the scale is set on the iPhone and the user cannot scroll the page or zoom in or out.
How may I disable these settings as I would like to have the carousel on a page which can be scrolled, and zoomed in/out.
Thanks.
[Sencha person] You can't zoom in or out of a Sencha component. Having fixed UI Chrome is one of the reasons to even use a UI framework (otherwise you'd might use a simple mobile-optimized web page).
You can have a scrollable area within a carousel, but you might want to consider whether that's really the best UX, since the carousel is already a scroller (it just scrolls in fixed increments) Take a look at touchstyle.mobi/app for an example of a data-store backed carousel.
I could be wrong, but it seems to me that the goal of sencha is to make full screen apps, so it seems logical that you cannot zoom/scroll the page ?
There are methods and plugins for zooming if you want.
Carousel ImageViewer (plugin) - Zoom feature
Pinch-to-zoom in panels
Pinch emulator (plugin)

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