Peter Lubbers - Pro HTML 5 Programming

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Download from Wow! eBook 252 CHAPTER 10 ■ CREATING HTML5 OFFLINE WEB APPLICATIONS Creating the HTML Structure and CSS of the UI This is the basic UI structure of the example. Both tracker.html and html5.css will be cached, so the application will be served from the application cache. HTML5 Offline Application Offline Example Check for Updates Log There are a couple of things to note in this HTML that pertain to this application's offline capabilities. The first is the manifest attribute on the HTML element. Most of the HTML examples in this book omit the element because it is optional in HTML5. However, the ability to cache offline depends on specifying the manifest file. The second thing to note is the button. That will give the user control over installing this application for offline use. Creating the Offline JavaScript For this example, the JavaScript is contained in multiple .js files included with tags. These scripts are cached along with the HTML and CSS. /* * log each of the events fired by window.applicationCache */
window.applicationCache.onchecking = function(e) { log("Checking for application update"); } window.applicationCache.onnoupdate = function(e) { log("No application update found"); } window.applicationCache.onupdateready = function(e) { log("Application update ready"); } window.applicationCache.onobsolete = function(e) { log("Application obsolete"); } window.applicationCache.ondownloading = function(e) { log("Downloading application update"); } window.applicationCache.oncached = function(e) { log("Application cached"); } window.applicationCache.onerror = function(e) { log("Application cache error"); } window.addEventListener("online", function(e) { log("Online"); }, true); window.addEventListener("offline", function(e) { log("Offline"); }, true); CHAPTER 10 ■ CREATING HTML5 OFFLINE WEB APPLICATIONS /* * Convert applicationCache status codes into messages */ showCacheStatus = function(n) { statusMessages = ["Uncached","Idle","Checking","Downloading","Update Ready","Obsolete"]; return statusMessages[n]; } install = function() { log("Checking for updates"); try { window.applicationCache.update(); 253
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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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Download from Wow! eBook 32 CHAPTE
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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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Page 294 and 295: 274 ■ INDEX Web SQL database supp
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Page 298 and 299: 278 ■ INDEX media elements. See a
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Page 304: 284 ■ INDEX stopping Web Workers,
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Peter Lubbers - Pro HTML 5 Programming

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