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CHAPTER 8 CREATING MOBILE WEB APPSListing 8-11. The getIndexOfCategory Functionfunction getIndexOfCategory(category) {var result = -1;for (var i = 0; i < cheeseModel.products.length; i++) {if (cheeseModel.products[i].category == category ||cheeseModel.products[i].shortName == category) {result = i;break;}}return result;}Listing 8-12 shows the changes in mobile.html to make use of this function.Listing 8-12. Managing Page Transition Animation Directionvar 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() + '"]'),{reverse: $(e.target).hasClass("left")});})$('a[data-role=button]').click(function(e) {e.preventDefault();var cIndex = getIndexOfCategory(cheeseModel.selectedCategory());var newIndex = getIndexOfCategory(this.hash.slice(1));$.mobile.changePage(this.hash, {reverse: cIndex > newIndex});});$.mobile.initializePage();226www.it-ebooks.info
CHAPTER 8 CREATING MOBILE WEB APPShasher.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) {$.each(cheeseModel.products, function(index, item) {if (item.shortName == (shortCat ||cheeseModel.products[0].shortName)) {crossroads.parse("category/" + item.category);}});});crossroads.parse(location.hash.slice(1));});});});I just needed to provide the optional argument to the changePage method to make the horizontalbuttons work. For the a elements, I decided to handle the click event, figure out the transition direction,and call the changePage method directly. There are other ways of doing this in jQuery Mobile, but this isthe simplest and most direct.The important jQuery Mobile characteristic I wanted to demonstrate relates to the way that internalURLs are managed. jQuery Mobile will navigate to the URL for the entire document rather than thespecific page if you use the changePage method to navigate to the URL that represents the first page inthe document. For example, if you call changePage('#British'), jQuery Mobile will navigate tocheeselux.com/mobile.html and not cheeselux.com/mobile.html#British.To cater for this, I need to change the route that maps between the jQuery Mobile–friendly fragmentURLs and the routes shared with the desktop version of the web app, like this:crossroads.addRoute(":shortCat:", function(shortCat) {$.each(cheeseModel.products, function(index, item) {if (item.shortName == (shortCat || cheeseModel.products[0].shortName)) {crossroads.parse("category/" + item.category);}});});I made the segment optional, rather than variable (I explain the difference in Chapter 4), and if thereis no category name provided as part of the URL, I assume that the first category in the view modelshould be used. This is a simple change for my web app, but if you are mapping complex sets of routes,you must ensure that you set defaults for all of the route segments that are expected and would usuallybe provided by the desktop version.227www.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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C H A P T E R 2Getting StartedIn th
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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};{id
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C H A P T E R 4Using URL RoutingIn
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CHAPTER 4 USING URL ROUTINGThe app
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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 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
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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