Safari iPhone - How to detect zoom level and offset?

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I looking for options on how to track user zooming and panning on a page when viewed in Safari on an iPhone. Safari exposes move and gesture events, so theoretically I can keep a running tally of pan and zoom operations, but that seems like overkill since the browser must track that internally.

Is this information exposed through the Document Object Model?


When you zoom in, window.innerWidth is adjusted, but document.documentElement.clientWidth is not, therefore:

var zoom = document.documentElement.clientWidth / window.innerWidth;

(I've tested iOS4, without viewport <meta>).

However, I wouldn't rely on it for anything important. DOM viewport sizes/pixel sizes in mobile browsers are a complete mess.

iphone, When you zoom in, window.innerWidth is adjusted, but document.​documentElement.clientWidth is not, therefore: zoom = document.​documentElement. Safari is an internet browser that is easy to use and in this tutorial we are going to show you how to adjust the zoom level of the websites you visit Don't forget to check out our site http


According to the Safari Web Content Guide, zoom events (double tap) are not exposed, so I'm not sure how you can track this.

I do not believe this information is exposed through the DOM.

Can JavaScript Detect the Browser's Zoom Level?, scale is always 1 in Safari and Chrome, and undefined in Firefox. In other words: useless. I don't entirely know if that is supposed to accurately  Set an appropriate zoom level according to our own choice to view a bigger size or a smaller size of an image. 1. Click on the cog icon located at the upper right corner of the Safari window.


Zoom in on the iPhone screen, In many apps, you can zoom in or out on specific items. For example, you can double-tap or pinch to look closer in Photos or expand webpage columns in Safari. On your iPad or iPhone, open up Safari, then go to any website (it doesn't matter which one) and tap on the Share icon at the bottom. In the share menu, tap on Add Bookmark . Name the bookmark Zoom (or anything else that will help you remember) and make sure that its Location is set to Bookmarks (your default may be "Favorites") for easy access.


I actually think things might have moved on a little since Steve's answer, as having a look at the content guide link he provided I can see a section on Handling Multi-Touch Events and also Handling Gesture Events.

Haven't tried them yet but they look pretty promising. I'll provide an update once I've checked them out and have a demo link available...

Visual Viewport API, remain on screen regardless of the pinch zoom level of the device? When called it queries the offsetLeft and height properties for values it offset from the layout viewport origin. var viewport = event.target; var offsetLeft = viewport. Opera Android Full support 45, Safari iOS Full support 13, Samsung  I looking for options on how to track user zooming and panning on a page when viewed in Safari on an iPhone. Safari exposes move and gesture events, so theoretically I can keep a running tally of pan and zoom operations, but that seems like overkill since the browser must track that internally.


I measure zoom this way (works on iOS only):

screenOrientedWidth = screen.width;
if (window.orientation == 90) {
    screenOrientedWidth = screen.height;
}
return screenOrientedWidth / window.innerWidth;

It doesn't depend of how wide content is.

However, in iOS Safari window.innerWidth isn't correct inside a gestureend handler. You should defer such calculation for later execution. In GWT, I use scheduleDeferred, but I can't say how to implement this in pure JavaScript.

Window.devicePixelRatio, devicePixelRatio to determine how much extra pixel density should be added to allow Monitoring screen resolution or zoom level changes. Detecting the browser zoom level and device pixel ratio relative to the zoom level. It can be used to show higher-resolution canvas or img when necessary, to warn users that your site's layout will be broken in their current zoom level, and much more.


Simple browser zoom detect with jquery #codevember, It will show zoom level and change some body background color. offsetHeight / window. devicePxPerCssPx: zoom * devicePixelRatio() }; } /** * For safari (same as chrome) * */ var safari= function() { var zoom = Math.round(((​document. Damon Oehlman. JS Developer hacking on various bits and pieces. mobile-safari. Score 6. Posts 1. View all tags → 1 Safari iPhone - How to detect zoom level


Can I use Support tables for HTML5, CSS3, etc, This covers the outline shorthand, as well as outline-width , outline-style , outline-​color and outline-offset . iOS Safari* 2 Does not support outline-offset . Change the zoom level. You can increase or decrease the zoom level—both text and images—of pages that you view in Safari on macOS Sierra. Safari will remember your settings until you clear your History. To increase the zoom level, press Command-Plus sign (+) To decrease the zoom level, press Command-Minus sign (-)


CSS zoom, Feature: CSS zoom. Add usage source CSS zoom. - UNOFF. Non-standard method of scaling content. iOS Safari*. 3.2; 4.1; 4.3; 5.1; 6.1; 7.1; 8; 8.4; 9.2; 9.3​  Detect page zoom change with jQuery in Safari. I have a problem with Safari in a web application that contains a position:fixed element. When the page is zoomed out (smaller 100%) things break and would need to be fixed by calling a function. So I'd like to detect the user's zooming.