Peter Lubbers - Pro HTML 5 Programming

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244 CHAPTER 10 ■ CREATING HTML5 OFFLINE WEB APPLICATIONS The HTML5 offline application cache makes it possible to augment an application to run without a network connection. You do not need a connection to the Internet just to draft an e-mail. HTML5 introduces the offline application cache that allows a Web application to run without network connectivity. An application developer can specify specific additional resources comprising an HTML5 application (HTML, CSS, JavaScript, and images) to make an application available for offline use. There are many use cases for this, for example: • Read and compose e-mail • Edit documents • Edit and display presentations • Create to-do lists Using offline storage can avoid the normal network requests needed to load an application. If the cache manifest is up to date, the browser knows it does not need to check if the other resources are also up to date, and most of the application can load very quickly out of the local application cache. Additionally, loading resources out of a cache (instead of making multiple HTTP requests to see if resources have been updated) saves bandwidth, which can be especially important for mobile web applications. Currently, slower loading is one way that web applications suffer in comparison with desktop applications. Caching can offset that. The application cache gives developers explicit control over caching. The cache manifest file allows you to group related resources into a logical application. This is a powerful concept that can give web applications some of the characteristics of desktop applications. You can use this additional power in new, creative ways. Resources identified in the cache manifest file create what is known as an application cache, which is the place where browsers store the resources persistently, typically on disk. Some browsers give users a way to view the data in the application cache. For example, the about:cache page in the latest version of Firefox shows you details about the application cache and a way to view individual files in the cache, as shown in Figure 10-1.
Figure 10-1. Viewing the offline cache in Firefox CHAPTER 10 ■ CREATING HTML5 OFFLINE WEB APPLICATIONS Browser Support for HTML5 Offline Web Applications Table 10-1 shows the browser support for HTML5 offline web applications at the time of this writing. As you can see, HTML5 offline web applications are already supported in many browsers. Table 10-1. Browser Support for HTML5 Offline Application Cache Browser Details Chrome Supported in version 4.0 and greater Firefox Supported in version 3.5 and greater Internet Explorer Not supported Opera Supported in version 10.6 and greater Safari Supported in version 4.0 and greater 245
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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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