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CHAPTER 8 CREATING MOBILE WEB APPSKnockout.js process the bindings that I generated from the template and make them live. This final stepmeans that my bindings will respond to changes in the view model.There are a couple of points to note about this technique. First, I am not trying to preventduplication of elements in the DOM. There is no easy way to deal with the jQuery Mobile formattingissues without duplicate element sets. My goal is to generate the duplicates from a single set of sourceelements so that I make changes in one place and have them take effect in all of the duplicates whenthey are generated.Second, when using this technique, you must ensure that you don’t refer to view model items exceptwithin a pair of quote characters (i.e., within a string). If you refer to a variable outside of a string, thenKockout.js will try to find a value to resolve the reference, and you will get an error. View model valuesare resolved in the second call to the applyBindings method and not when the template is used to createelements.• Caution It can be difficult to get the string properly set up, but the effort is worthwhile for complex sets ofelements. For simpler situations, I suggest you simply duplicate what you need inside the document and skip thetemplates altogether. The source code download for this book contains the full listings for this example.Adopting the Multipage ModelMy mobile web app is shaping up, but I am still missing URL routing, which means there is a significantdifference between the mobile and desktop versions. The first step in adding support for routing is toembrace the multipage model. As I explained earlier, jQuery Mobile supports the idea of having multiplepages in a single HTML document. I will use this feature to provide the user with the means to navigatebetween categories. Listing 8-10 shows the changes that are required.Listing 8-10. Adding Support for the Multipage ModelCheeseLux$(document).bind("mobileinit", function() {$.mobile.autoInitializePage = false;});220www.it-ebooks.info
CHAPTER 8 CREATING MOBILE WEB APPSvar cheeseModel = {};detectDeviceFeatures(function(deviceConfig) {cheeseModel.device = deviceConfig;checkForVersionPreference();$.getJSON("products.json", function(data) {cheeseModel.products = data;enhanceViewModel();$(document).ready(function() {ko.applyBindings(cheeseModel);$('*.deferred').each(function(index, elem) {ko.applyBindings(cheeseModel, elem);});$('button.left, button.right').live("click", function(e) {e.preventDefault();advanceCategory(e, $(e.target).hasClass("left")? "left" : "right");$.mobile.changePage($('div[data-category="'+ cheeseModel.selectedCategory() + '"]'));})$.mobile.initializePage();hasher.initialized.add(crossroads.parse, crossroads);hasher.changed.add(crossroads.parse, crossroads);hasher.init();crossroads.addRoute("category/:newCat:", function(newCat) {cheeseModel.selectedCategory(newCat ||cheeseModel.products[0].category);});crossroads.addRoute("{shortCat}", function(shortCat) {$.each(cheeseModel.products, function(index, item) {if (item.shortName == shortCat) {crossroads.parse("category/" + item.category);}});});crossroads.parse(location.hash.slice(1));});});});
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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 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 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 ROUTING}"#sele
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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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Page 169 and 170: C H A P T E R 7Creating Responsive
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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 269 and 270: • 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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