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CHAPTER 9 WRITING BETTER JAVASCRIPTUsing an AMD ModuleAMD solves the dependency issues by having a single resource loader take responsibility for loadinglibraries. This loader is responsible for executing a module’s factory function and ensuring that thelibraries it relies on are loaded and ready before this happens. The main means of communicationbetween a module and the loader is through the define function, which the loader is responsible forimplementing.By standardizing the loading process, the decision about which loader to use is left to the consumerof AMD modules, rather than the author. So, I don’t have to worry about resolving dependencies when Iwrite an AMD module, and I don’t even have to worry about how they will be dealt with.Although the AMD format is gaining popularity, not all resource loaders support AMD. This includesModernizr.load, which I have been using to load libraries so far in this book (and to demonstrate whythis is a bad idea in this chapter). My favorite AMD-aware loader is requireJS, which you can downloadfrom http://requirejs.org. You can see how I have applied requireJS to my tiny web app in Listing 9-12.Listing 9-12. Using requireJS to Load AMD ModulesCheeseLuxvar libs = ['utils-amd','device-amd','custombindings-amd','jquery-1.7.1.js','knockout-2.0.0.js','modernizr-2.0.6.js'];require(libs, function(utils, device) {var cheeseModel = {selectedCount: ko.observable(0)};$(document).bind("mobileinit", function() {$.mobile.autoInitializePage = false;});$.getJSON("products.json", function(data) {cheeseModel.products = data;device.detectDeviceFeatures(function(deviceConfig) {cheeseModel.device = deviceConfig;$(document).ready(function() {ko.applyBindings(cheeseModel);246www.it-ebooks.info
CHAPTER 9 WRITING BETTER JAVASCRIPTrequirejs(['jquery.mobile-1.0.1.js'], function() {$.mobile.initializePage();$('a[data-role=button]').click(function(e) {var count = 0;utils.mapProducts(function(inner, outer) {if (outer.category == e.currentTarget.id) {count++;}}, cheeseModel.products, "items")cheeseModel.selectedCount(count);});});});});});});There are cheeses in this categoryDeclaring DependenciesThe first thing to do is remove all of the script elements in the head section of the document and replacethem with a single element that imports requireJS. This ensures that requireJS has a complete view of allof the dependencies in the web app and that you don’t end up loading script files twice if they arerequired in dependent libraries....var libs = ['utils-amd','device-amd','custombindings-amd','jquery-1.7.1.js','knockout-2.0.0.js',247www.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 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 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 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 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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C H A P T E R 6Storing Data in the
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CHAPTER 6 STORING DATA IN THE BROW
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C H A P T E R 7Creating Responsive
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CHAPTER 7 CREATING RESPONSIVE WEB
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Page 195 and 196: C H A P T E R 8Creating Mobile Web
Page 197 and 198: CHAPTER 8 CREATING MOBILE WEB APPS
Page 229 and 230: C H A P T E R 9Writing Better JavaS
Page 231 and 232: CHAPTER 9 WRITING BETTER JAVASCRIP
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Page 267 and 268: Contents• About the Author.......
Page 269 and 270: • CONTENTS• Chapter 3: Adding a
Page 271 and 272: • CONTENTSUsing Persistence in th
Page 273 and 274: • CONTENTSAdding Tests for a Modu
Page 275 and 276: About the Technical Reviewer RJ Owe
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