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CHAPTER 5 CREATING OFFLINE WEB APPSSummaryIn this chapter, I showed you how to use the HTML5 Application Cache to create offline applications. Byusing the application cache, you can create applications that are available even when the user doesn’thave a network connection. Although the core of the application cache is well-supported, there are someanomalies, and careful design and testing are required to get a result that is reliable and robust. In thenext chapter, I’ll show you how to use some related functionality that helps smooth out some of therough edges of offline apps and that can be used to create a better experience for the user.136www.it-ebooks.info
C H A P T E R 6Storing Data in the BrowserA natural complement to offline applications is client-side data storage. HTML5 defines some usefulJavaScript APIs for storing data in the browser, ranging from simple name/value pairs to using aJavaScript object database. In this chapter, I show you how to build applications that rely on persistentlystored data, including details of how to use such data in an offline web application.• Caution The browser support for data storage is mixed. You should run the examples in this chapter usingGoogle Chrome, with the exception of those in the IndexedDB section, which will run only in Mozilla Firefox.Using Local StorageThe simplest way to store data in the browser is to use the HTML5 local storage feature. This allows youto store simple name/value pairs and retrieve or modify them later. The data is stored persistently but isnot guaranteed to be stored forever. The browser is free to delete your data if it needs the space (or if thedata hasn’t been accessed for a long time), and, of course, the user can clear the data store at any time,even when your web app is running. The result is data that is broadly, but not indefinitely, persistent.Using local storage is very similar to using a regular JavaScript array, as Listing 6-1 demonstrates.Listing 6-1. Using Local StorageLocal Storage Examplevar viewModel = {137www.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 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...$('spa
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CHAPTER 2 GETTING STARTEDFigure 2-
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CHAPTER 2 GETTING STARTED...This c
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CHAPTER 2 GETTING STARTEDSummaryAs
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CHAPTER 3 ADDING A VIEW MODELCreat
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CHAPTER 3 ADDING A VIEW MODEL$('#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 MODEL});if
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C H A P T E R 4Using URL RoutingIn
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CHAPTER 4 USING URL ROUTINGwe requ
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CHAPTER 4 USING URL ROUTINGAdding
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CHAPTER 4 USING URL ROUTINGApplyin
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Page 109 and 110: C H A P T E R 5Creating Offline Web
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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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