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Introducing HTML5 for Building Online Games

Oct 13, 2011

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Learning HTML5 Game Programming: A Hands-on Guide to Building Online Games Using Canvas, SVG, and WebGL

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Application Cache

Application Cache provides a method of running applications while offline, much like the LocalServer feature in Gears. A point of distinction between the two features is that Application Cache doesn't use a JSON file, using a flat file instead to specify which files to cache. A simple manifest file to cache assets is shown in Listing 1-4.

Listing 1-4. Sample Application Manifest

CACHE MANIFEST
# above line is required, this line is a comment
mygame/game.html
mygame/images/image1.png
mygame/assets/sound2.ogg

The Application Cache has several events it can respond to: onchecking, error, cached, noupdate, progress, updateready, and obsolete. You can use these events to keep your users informed about the application's status. Using the Application Cache can make your game more tolerant to connectivity outages, and it can make your users happy by letting them start game play quicker (after the assets are cached). Also, if you choose, Application Cache can be used to allow users to play your game offline. Don't worry too much about it right now. In Chapter 11, "Publishing Your Games," we discuss using the Application Cache in more detail.

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