Windows 8 programming with html and java script
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A few slides to get people familiar with Windows 8 applications in JavaScript - WinJS, app lifecycle, app container, and more
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Visit: http://www.cyberlabzone.com
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- 1. Chad McCallum ASP.NET/IIS MVP iQmetrix Software http://www.rtigger.com @ChadEmm / chadm@iqmetrix.com
- 2. Windows RT API Windows Runtime is implemented at a low-level and then “projected” into C++, C#, VB, and JavaScript APIs Allows the APIs to present the same functionality in a way that’s familiar to developers of that language
- 3. Native App in HTML? Apps are run in an Internet Explorer 10 shell This means: Can include other JS libraries HTML5 and CSS3 support for user interface Can do (almost) anything you’d do with a web application
- 4. What are these apps called? Windows Store apps Acquired, installed, and updated via the Windows Store app Packaged into an “.appx” file when submitted Contains a manifest file that describes the app, the resources it uses (camera, network, etc.), and lists OS integrations (background tasks, file associations, etc.)
- 5. Windows Library for JavaScript aka WinJS Wrapper for Windows Runtime API Provides: Access to system-level resources HTML implementation of WinRT controls, complete with CSS styling and events CSS3-based animation framework Helpers for common coding patterns
- 6. Not Quite a Web Page Some DOM API calls are modified or unavailable, like alert or window.open There are some methods, properties, and CSS queries that are specific to a Windows Store app Allowed to make cross-domain requests, load resources from remote sources
- 7. Not Quite a Web Page Not allowed to reference scripts remotely IFrames are run in “web context” without access to WinRT Some DOM-based calls are modified or removed (document.write, innerHTML)
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- 9. App Lifecycle 4-ish states Starting: shows splash screen image, does all the app initialization behind the scenes Running: active application on user’s device Suspending: app has lost focus, 5 seconds to save state Resuming: app has regained focus Suspended: still in memory, but not allocated any CPU time Terminated: removed from memory, effectively closed. OS triggers this at will, app is not informed
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- 11. Code Time!