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CHAPTER 5 CREATING OFFLINE WEB APPSFigure 5-4. Linking to the news.html pageBecause it is in the NETWORK section, the news.html file is never added to the application cache. WhenI click the News button, the browser acts as it would for regular content. It contacts the server, gets theresources, and adds them to the regular (nonapplication) cache, before showing them to the user. I canmake changes to the news.html file, and they will be displayed to the user even when the applicationcache hasn’t been updated.When the browser goes offline, there is no way to get hold of the content that is not in theapplication cache. This is where the FALLBACK entries come in. The format of these entries is differentfrom the others.• Caution Browsers take different views about what being offline means. I explain more about this in the“Monitoring Offline Status” section later in this chapter.The first part specifies a prefix for resources, and the second part specifies a file to use when aresource that matches the prefix is requested while the browser is offline. So, in Listing 5-7, I have set themanifest so that any request to any URL (represented by /) should be given the file offline.html instead.124www.it-ebooks.info
CHAPTER 5 CREATING OFFLINE WEB APPSListing 5-7. Using a Fallback Entry in the Application Manifest...# fontsfonts/YanoneKaffeesatz-Regular.ttffonts/fanwood_italic-webfont.ttffonts/ostrich-rounded-webfont.woffFALLBACK:/ offline.html• Tip Browsers handle fallback for resources in the network inconsistently. You should not rely on the fallbacksection to provide substitute content for URLs that are listed in the network section, only those that are in the mainpart of the manifest. Support for providing fallbacks for individual files is also inconsistent, which is why I haveused the broadest possible fallback in the examples for this chapter. I expect the reliability and consistency ofthese features to improve as the HTML5 implementations stabilize.When the browser is offline, clicking the News button triggers a request for a URL that the browsercannot service from the application cache, and the fallback entry is used instead. You can see the resultin Figure 5-5. The URL in the browser address bar shows the URL that was requested, but the contentthat is shown is from the fallback resource.Figure 5-5. Using the fallback entry125www.it-ebooks.info
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Contents at a Glance• About the A
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CHAPTER 1 GETTING READYWhat Do You
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CHAPTER 1 GETTING READYChapter 8:
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CHAPTER 1 GETTING READYWould you l
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CHAPTER 1 GETTING READYThe server-
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CHAPTER 1 GETTING READYListing 1-3
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CHAPTER 1 GETTING READY{{each prop
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C H A P T E R 2Getting StartedIn th
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CHAPTER 2 GETTING STARTEDListing 2
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CHAPTER 2 GETTING STARTED• Cauti
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CHAPTER 2 GETTING STARTEDIn Listin
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CHAPTER 2 GETTING STARTEDHandling
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CHAPTER 2 GETTING STARTEDFigure 2-
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CHAPTER 2 GETTING STARTED($0)Total
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CHAPTER 2 GETTING STARTED})}$('.la
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CHAPTER 2 GETTING STARTEDOnce agai
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CHAPTER 2 GETTING STARTED...$('spa
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CHAPTER 2 GETTING STARTEDFigure 2-
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CHAPTER 2 GETTING STARTED...This c
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CHAPTER 2 GETTING STARTED• Tip O
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CHAPTER 2 GETTING STARTEDSummaryAs
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CHAPTER 3 ADDING A VIEW MODELCreat
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CHAPTER 3 ADDING A VIEW MODEL$('#b
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CHAPTER 3 ADDING A VIEW MODEL};{id
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CHAPTER 3 ADDING A VIEW MODEL $()T
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CHAPTER 3 ADDING A VIEW MODELimmed
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CHAPTER 3 ADDING A VIEW MODELYou c
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CHAPTER 3 ADDING A VIEW MODELmapPr
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CHAPTER 3 ADDING A VIEW MODELAs I
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Page 77 and 78: C H A P T E R 4Using URL RoutingIn
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Page 109 and 110: C H A P T E R 5Creating Offline Web
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Page 137 and 138: C H A P T E R 6Storing Data in the
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Page 169 and 170: C H A P T E R 7Creating Responsive
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CHAPTER 7 CREATING RESPONSIVE WEB
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C H A P T E R 8Creating Mobile Web
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CHAPTER 8 CREATING MOBILE WEB APPS
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C H A P T E R 9Writing Better JavaS
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CHAPTER 9 WRITING BETTER JAVASCRIP
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• INDEXHTML5 local storage featur
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• INDEXURL routing, CheeseLux (co
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Pro JavaScript for Web AppsCopyrigh
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Contents• About the Author.......
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• CONTENTS• Chapter 3: Adding a
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• CONTENTSUsing Persistence in th
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• CONTENTSAdding Tests for a Modu
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About the Technical Reviewer RJ Owe
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