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CHAPTER 5 CREATING OFFLINE WEB APPSWhen either cache button is clicked, I read the value of the data-action attribute. If the attributevalue is update, then I call the cache update method. This causes the browser to check with the server tosee whether the manifest has changed. If it has, then the status of the cache will change to UPDATEREADY,and the Apply Update button will be shown to the user.When the Apply Update button is clicked, I call the swapCache method to push the updates into theapplication cache. These updates won’t take effect until the application is reloaded, which I force bycalling the window.location.reload method. This means the updates are applied to the cache andimmediately used in response to a single action by the user. The simplest way to test these additions is totoggle the status of the blackwave.png image in the manifest and apply the resulting update. See theinformation on the cache control header if you want to test more substantial changes.APPLICATION CACHE ENTRIES AND THE CACHE-CONTROL HEADERCalling the applicationCache method doesn’t always cause the browser to contact the server to seewhether the manifest has changed. All of the mainstream browsers honor the HTTP Cache-Controlheader and will check for updates only when the life of the manifest has expired.Further, even if the manifest has changed, the browser honors the Cache-Control value for individualmanifest items. This can lead to a situation where an update to an HTML or script file is ignored if themanifest changes within the Cache-Control lifetime of the affected resource.In production, this behavior is perfectly reasonable. But during development and testing, it’s a huge painsince changes made to the contents of HTML and script files won’t be immediately reflected in an update.To get around this, I have set a very short cache life on the content served by the Node.js server. You’llneed to do something similar to your development servers to get the same effect.Adding Network and Fallback Entries to the ManifestRegular manifest entries tell the browser to proactively obtain and cache resources that the web apprequires. In addition, the application cache supports two other manifest entry types: network andfallback entries. Network entries, also known as whitelist entries, specify a resource that the browsershould not cache. Requests for these resources will always result in a request to the server while thebrowser is online. This is useful to ensure that the user always receives the latest version of a file, eventhough the rest of the application is cached.The fallback entries tell the browser what to do when the browser is offline and the user requests anetwork entry. Fallback entries allow you to substitute an alternative file rather than displaying an errorto the user. Listing 5-6 shows the use of both kinds of entry in the cheeselux.appcache file.Listing 5-6. Using a Network Entry in the Application ManifestCACHE MANIFEST# HTML documentexample.html# script filesjquery-1.7.1.jsjquery-ui-1.8.16.custom.js122www.it-ebooks.info
CHAPTER 5 CREATING OFFLINE WEB APPSknockout-2.0.0.jssignals.jscrossroads.jshasher.jsutils.js# CSS filesstyles.cssjquery-ui-1.8.16.custom.css# imagesblackwave.pngcheeselux.pngimages/ui-bg_flat_75_eb8f00_40x100.pngimages/ui-bg_flat_75_fbbe03_40x100.pngimages/ui-icons_ffffff_256x240.pngimages/ui-bg_flat_75_595959_40x100.pngimages/ui-bg_flat_65_fbbe03_40x100.png# fontsfonts/YanoneKaffeesatz-Regular.ttffonts/fanwood_italic-webfont.ttffonts/ostrich-rounded-webfont.woffNETWORK:news.htmlThe network entries are prefixed with the word NETWORK and a colon (:). As with the regular entries,each resource occupies a single line. In this listing, I have created a network entry for the file news.html. Ihave created a button that links to this file in the example.html file, like this:Gourmet European CheeseCheck for UpdatesApply UpdateNewsWhen the browser is online, clicking this link displays the news.html file. You can see the effect inFigure 5-4.123www.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 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...$('spa
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CHAPTER 2 GETTING STARTEDFigure 2-
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CHAPTER 2 GETTING STARTEDSummaryAs
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CHAPTER 3 ADDING A VIEW MODELCreat
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CHAPTER 3 ADDING A VIEW MODEL$('#b
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CHAPTER 3 ADDING A VIEW MODEL};{id
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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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