Peter Lubbers - Pro HTML 5 Programming

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248 CHAPTER 10 ■ CREATING HTML5 OFFLINE WEB APPLICATIONS Listing 10-5. Example Manifest File with All Possible Sections #comments begin with the hash symbol CACHE MANIFEST # files to cache about.html html5.css index.html happy-trails-rc.gif lake-tahoe.JPG #do not cache signup page NETWORK signup.html FALLBACK signup.html offline.html /app/ajax/ default.html Let’s look at the different sections. If no heading is specified, CACHE MANIFEST is the default section. The following simple manifest specifies that two files are to be cached: CACHE MANIFEST application.js style.css By listing a file in the CACHE MANIFEST section, you instruct the browser to serve the file from the application cache, even if the application is online. It is unnecessary to specify the application's main HTML resource. The HTML document that initially pointed to the manifest file is implicitly included. However, if you want to cache multiple HTML documents or if you would like multiple HTML documents to act as possible entry points for the cacheable application, they should all be listed in the cache manifest file. FALLBACK entries allow you to give alternate paths to replace resources that cannot be fetched. The manifest in Listing 10-5 would cause requests to /app/ajax/ or subpaths beginning with /app/ajax/ to fall back to default.html when /app/ajax/* is unreachable. NETWORK denotes resources that are always fetched using the network—even if a cached resource matches the request path. The applicationCache API The applicationCache API is an interface for working with the application cache. A new window.applicationCache object fires several events related to the state of the cache. The object has a numerical property, window.applicationCache.status, which indicates the state of the cache. The six states a cache can have are shown in Table 10-2.
Table 10-2. The Six Cache States Numerical Property Cache Status 0 UNCACHED 1 IDLE 2 CHECKING 3 DOWNLOADING 4 UPDATEREADY 5 OBSOLETE CHAPTER 10 ■ CREATING HTML5 OFFLINE WEB APPLICATIONS Most pages on the Web today do not specify cache manifests and are uncached. Idle is the typical state for an application with a cache manifest. An application in the idle state has all its resources stored by the browser with no updates in progress. A cache enters the obsolete state if there was at one point a valid cache but the manifest is now missing. There are events (and callback attributes) in the API that correspond to some of these states. For instance, when the cache enters the idle state after an update, the cached event fires. At that time, an application might notify the user that they can disconnect from the network and still expect the application to be available in offline mode. Table 10-3 shows some common events and their associated caches states. Table 10-3. Common Events and Their Cache States Event Associated Cache State onchecking CHECKING ondownloading DOWNLOADING onupdateready UPDATEREADY onobsolete OBSOLETE oncached IDLE Additionally, there are events indicating update progress, when no update is available, or when an error has occurred: • onerror • onnoupdate • onprogress 249
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THE EXPERT’S VOICE ® IN WEB DEVE
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■ ■ ■ Pro HTML5 Programming P
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For my beautiful wife, Vittoria, an
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Contents ■Foreword ..............
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■ CONTENTS Implementing Canvas Se
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■ CONTENTS Summary ..............
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■ CONTENTS Setting and Retrieving
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Foreword In June 2004, representati
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About the Technical Reviewer � Pa
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Introduction HTML5 is brand new. In
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C H A P T E R 1 ■ ■ ■ Overvie
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CHAPTER 1 ■ OVERVIEW OF HTML5 wit
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Interoperability Simplification CHA
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• MathML • Microdata • Server
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Figure 1-1. A page rendered in stan
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Table 1-2. New sectioning HTML5 ele
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CHAPTER 1 ■ OVERVIEW OF HTML5 Wit
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article { background-color: #eee; d
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Figure 1-2. An HTML5 page with all
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CHAPTER 1 ■ OVERVIEW OF HTML5 The
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Figure 1-3. Developer Tools view in
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CHAPTER 1 ■ OVERVIEW OF HTML5 All
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26 CHAPTER 2 ■ USING THE HTML5 CA
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C H A P T E R 3 ■ ■ ■ Working
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Audio and Video Codecs CHAPTER 3
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Table 3-1. Browser support for HTML
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MEDIA FOR EVERYONE CHAPTER 3 ■ WO
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CHAPTER 3 ■ WORKING WITH HTML5 AU
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Table 3-4 shows a few of the read-o
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find the actual frame since the vid
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LOSING VIEWERS IN THE OF AN EYE CH
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C H A P T E R 4 ■ ■ ■ Using t
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A device can use any of the followi
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Table 4-4. Pros and cons of cell ph
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Figure 4-1. HTML5 Geolocation brows
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CHAPTER 4 ■ USING THE HTML5 GEOLO
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Listing 4-6. The Haversine formula
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Listing 4-9. Adding the loadDemo()
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THE EASIEST WAY TO TRAVEL CHAPTER 4
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var deltaLatitude = toRadians(latit
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Practical Extras CHAPTER 4 ■ USIN
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Show Me on a Google Map CHAPTER 4
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CHAPTER 5 ■ USING THE COMMUNICATI
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var defaultTitle = "Portal [http://
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Send Notification CHAPTER 5 ■ U
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Figure 5-4. Difference between clie
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“SEEMINGLY ARBITRARY” TIMES CHA
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crossOriginRequest.upload.onprogres
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Figure 6-1. The complexity of real-
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Listing 6-2. The WebSocket interfac
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Listing 6-4. HTTP response header H
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Figure 6-4. Latency comparison betw
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EXISTING WEBSOCKET SERVERS CHAPTER
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CHAPTER 6 ■ USING THE HTML5 WEBSO
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def terminate(self): self.ready_sta
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self.sessions = [] self.port = port
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Basic API Usage CHAPTER 6 ■ USING
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HTML5 WebSocket / Geolocation Track
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} } Summary incomingRow = docume
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170 CHAPTER 7 ■ USING THE HTML5 F
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194 CHAPTER 8 ■ USING THE HTML5 W
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196 CHAPTER 8 ■ USING THE HTML5 W
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Peter Lubbers - Pro HTML 5 Programming

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