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CHAPTER 7 CREATING RESPONSIVE WEB APPSListing 7-3. Using CSS Media Queries to Respond to Screen Sizes...Gourmet European Cheese...CSS media queries are live, which means the category of screen size can change if the browserwindow is resized. This isn’t much use on mobile devices, but it means that a responsive web app willadapt to the display size even on a desktop platform. You can see how the layouts alter in Figure 7-3.Figure 7-3. Using media queries to manage the visibility of elementsUsing Media Queries with JavaScriptTo properly integrate media queries into a web app, we need to use the View module of the W3C CSSObject Model specification, which brings JavaScript media queries support into the browser. Mediaqueries are evaluated in JavaScript using the window.matchMedia method, as shown in Listing 7-4. I havedefined the detectDeviceFeatures function in the utils.js file; at the moment, it detects only the screensize, but I’ll detect some additional features later. There is a lot going on in the listing, so I’ll break itdown and explain the various parts in the sections that follow.Listing 7-4. Using a Media Query in JavaScriptfunction detectDeviceFeatures(callback) {var deviceConfig = {};Modernizr.load({test: window.matchMedia,nope: 'matchMedia.js',complete: function() {174www.it-ebooks.info
CHAPTER 7 CREATING RESPONSIVE WEB APPSvar screenQuery = window.matchMedia('screen AND (max-width:500px)');deviceConfig.smallScreen = ko.observable(screenQuery.matches);if (screenQuery.addListener) {screenQuery.addListener(function(mq) {deviceConfig.smallScreen(mq.matches);});}deviceConfig.largeScreen = ko.computed(function() {return !deviceConfig.smallScreen();});setInterval(function() {deviceConfig.smallScreen(window.innerWidth
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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 MODELThe o
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CHAPTER 3 ADDING A VIEW MODEL};{id
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CHAPTER 3 ADDING A VIEW MODELfunct
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CHAPTER 3 ADDING A VIEW MODELFigur
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CHAPTER 3 ADDING A VIEW MODELitem.
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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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CHAPTER 3 ADDING A VIEW MODELFigur
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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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CHAPTER 4 USING URL ROUTINGConsoli
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CHAPTER 4 USING URL ROUTINGListing
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CHAPTER 4 USING URL ROUTINGThe app
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CHAPTER 4 USING URL ROUTINGurl att
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CHAPTER 4 USING URL ROUTINGThe sel
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CHAPTER 4 USING URL ROUTING• Not
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CHAPTER 4 USING URL ROUTINGcrossro
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CHAPTER 4 USING URL ROUTINGRestori
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CHAPTER 4 USING URL ROUTINGAdding
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CHAPTER 4 USING URL ROUTING}"#sele
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CHAPTER 4 USING URL ROUTINGFigure
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CHAPTER 4 USING URL ROUTING• Tip
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C H A P T E R 5Creating Offline Web
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CHAPTER 5 CREATING OFFLINE WEB APP
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CHAPTER 8 CREATING MOBILE WEB APPS
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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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