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Cross Browser Zoom and Pixel Ratio Detector ====== ------ ### Known issues: * In Firefox on retina displays (Macbook Pros), the base zoom level is always 2.0. I'm aware of it and looking for a solution. * In some multi-monitor enviroments where each monitor has a different 'pixel aspect ratio' windows that span accross both monitors might return false pixelAspectRatio values. What is this for? ------ 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. Personally I'm maintaining it to use Detect-zoom in [Wix.com](http://wix.com)'s editor to warn users that their browser is in zoom mode before saving important changes to their website. What happend to @yonran? ------ Don't worry, he is well. As of January 2013 [@yonran](https://github.com/yonran) stopped maintaining his source of detect-zoom, and transferred the repository to me. If you are looking to update previous versions note that there were some breaking changes * **Major Changes from the latest yonran version:** * `DetectZoom` object name changed to `detectZoom` * `DetectZoom.ratio()` is no longer publicly accessible * Supported browsers: IE8+, FF4+, modern Webkit, mobile Webkit, Opera 11.1+ * *IE6, IE7, FF 3.6 and Opera 10.x are no longer supported* * Added support to be loaded as an AMD and CommonJS module Live Example ------ See the Live Example section in http://tombigel.github.com/detect-zoom/ Usage ------ **Detect-zoom has only two public functions:** * `zoom()` Returns the zoom level of the user's browser using Javascript. * `device()` Returns the device pixel ratio multiplied by the zoom level (Read [more about devicePixelRatio](http://www.quirksmode.org/blog/archives/2012/07/more_about_devi.html) at QuirksMode) ```html <script src="detect-zoom.js"></script> <script> var zoom = detectZoom.zoom(); var device = detectZoom.device(); console.log(zoom, device); </script> ``` **AMD Usage** ```javascript require(['detect-zoom'], function(detectZoom){ var zoom = detectZoom.zoom(); }); ``` **Installing with NPM** ```bash > npm install detect-zoom ``` Changelog ------ 2013/4/01 * Changed WebKit detection from deprecated webkitTextSizeAdjust to webkitMarquee * Changed WebKitMobile detection from unreliable 'ontouchstart' event (can be triggered on desktops too) to 'orientation' property that is hopefully more reliable * Minor version bump to 1.0.4 2013/3/29 * Added package.json (thanks [@TCampaigne](https://github.com/TCampaigne)) * Some documentation fixes * Added detect-zoom to npm package manager (again, thanks [@TCampaigne](https://github.com/TCampaigne)) 2013/2/25 * Fixed a missing 'else' between ie8 and ie10 detection * Minor version bump to 1.0.2 2013/2/15 * Added a fix for IE10 Metro (or whatever MS calls it these days..) by [@stefanvanburen](https://github.com/stefanvanburen) * Minor version bump to 1.0.1 * Added minimized version 2013/2/05 * Merged a pull request that fixed zoom on IE being returned X100 (thanks [@kreymerman](https://github.com/kreymerman)) * Refactored the code some more, changed some function names * Browser dependent main function is created only on initialization (thanks [@jsmaker](https://github.com/jsmaker)) * _Open Issue: Firefox returns `zoom` and `devicePixelRatio` the same. Still looking for a solution here._ * Started versioning - this is version 1.0.0 2013/1/27 * Added a fix to Mozilla's (Broken as I see it - https://bugzilla.mozilla.org/show_bug.cgi?id=809788) implementation of window.devicePixel starting Firefox 18 2013/1/26 * Repository moved here * Refactored most of the code * Removed support for older browsers * Added support for AMD and CommonJS Help Needed ------ ***Detect-zoom is not complete, many parts of the code are 6 to 12 months old and I'm still reviewing them I need help testing different browsers, finding better ways to measure zoom on problematic browsers (ahm.. Firefox.. ahm) patches are more than welcome.*** License ------ Detect-zoom is dual-licensed under the [WTFPL](http://www.wtfpl.net/about/) and [MIT](http://opensource.org/licenses/MIT) license, at the recipient's choice.
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