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Launching, resuming, and multitasking (HTML)

Learn how to launch, suspend, and resume your app. Also learn about file associations, AutoPlay, transferring data in the background, and running your own code in the background with background tasks.

Launching, suspending, and resuming apps

When users move your app off-screen, Windows 8 suspends your app in memory. This allows another app to have the foreground. When an app is suspended, it is resident in memory, and Windows has stopped it from running.

When users bring your app back to the foreground, they expect the app to resume where they left off. As long as your app stays suspended, Windows automatically preserves your app's data in memory and restores it when your app resumes. Apps are also terminated occasionally, so your app should use suspending events to save its current state.

Note  If you need to do asynchronous work when your app is being suspended you will need to defer completion of suspend until after your work completes. You can use the setPromise method on the checkpoint event arg’s detail property to delay completion of suspend until after you complete the promise.

File and URI associations

You can launch the user's default app for a file type or URI. You can also enable your app to be the default app for a file type or URI scheme name.

AutoPlay

When users connect a device to their computer, you can ensure your app is available for them to choose.

Background file transfer

Windows helps your app manage file transfers to and from locations on the web, even if the user switches to a different app.

Background tasks

You can use background tasks to run lightweight code in the background. Any app can register a background task in response to certain system events. Background tasks can't run code that directly updates the UI; instead, they show information to the user with tile updates, badge updates, and toast notifications. Some apps, like mail, VOIP, and IM, allow the user to communicate in real-time. If the user allows, your app can show a badge or tile on the lock screen. When your app is on the lock screen, it gains access to real-time background tasks.

For detailed guidance on background tasks see Supporting your app with background tasks.

Multitasking with notifications and background audio

You can also keep providing functionality from the background with notifications and background audio. See the following topics outside of this section.

Related topics

Roadmap for Windows Store apps using JavaScript
Lock screen overview
Guidelines and checklist for lock screen tiles

 

 

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