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CHAPTER 10 ■ SCRIPTING BOM 432 }); Why bother making those changes? Wouldn’t adding a call to getData() to the old load event listener, say like in the following code, work just as well? addListener(window, "load", function(e) { presetSkin(); getData("data/s2.html", parseHTML); prepSprites(); prepDrag(); prepSkinKeys(); prepScrollers(); }); Well no, it wouldn’t. Because we requested data/s2.html asynchronously, JavaScript does not block until data/s2.html has loaded. That is to say, prepSprites() and prepScrollers() would very likely run before parseHTML() added the new scroller to the page. Therefore, pressing on the arrows for the new scroller would do nothing whatsoever. That would be bad, so let’s add the prep() function, save ten.js, and reload ten.html in Firefox. Put the new scroller through the wringer, verifying you work with Figure 10–3. Figure 10–3. Testing the HTML scroller Parsing an XML Response For the first few years, XML was the preferred data exchange format for Ajax. Although JSON (which we will cover in a bit) has overtaken XML in popularity, you will likely need to work with XML for years to come. With this in mind, let’s write a function named parseXML() to parse the contents of the XML file, data/s3.xml, code for which appears in this section. This is the data from the original ten.html, marked up as data:
CHAPTER 10 ■ SCRIPTING BOM ten.html images/lunaracer.jpg Nike LunaRacer ten.html images/glide_bos.jpg Nike Lunar Glide, Boston ten.html images/glide_nyc.jpg Nike Lunar Gllide, NYC ten.html images/mariah.jpg Nike Mariah ten.html images/fly_org.jpg Nike Lunar Fly, Orange ten.html images/fly_blk.jpg Nike Lunar Fly, Black ten.html images/elite.jpg Nike Lunar Elite ten.html images/vomero.jpg Nike Zoom Vomero ten.html images/max.jpg Nike Air Max We’ll use this data in a second scroller below the one we created in the previous example. The first thing we need to do is move the prep() invocation from parseHTML() to parseXML(), replacing it with a call to getData() for data/s3.xml. Doing so ensures the two new scrollers are in the DOM tree prior to JavaScript running prepSprites() and prepScrollers(). function parseHTML(req) { if (req.status === 200 || req.status === 304) { 433
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THE EXPERT’S VOICE ® IN WEB DEVE
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ii JavaScript for Absolute Beginner
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iv Contents at a Glance ■Contents
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■ CONTENTS vi ■Chapter 2: Type
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■ CONTENTS viii Sharing a Prototy
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■ CONTENTS x Querying Attributes
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■ CONTENTS xii Getting the User
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■ CONTENTS xiv About the Technica
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■ PREFACE xvi Preface In the 2005
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■ PREFACE xviii Opening Firebug L
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■ PREFACE xx Now press Return on
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■ PREFACE xxii editor reappear. N
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■ PREFACE xxiv
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CHAPTER 1 ■ REPRESENTING DATA WIT
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CHAPTER 2 ■ TYPE CONVERSION 26 Fi
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CHAPTER 2 ■ TYPE CONVERSION 50 Co
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CHAPTER 2 ■ TYPE CONVERSION 54 To
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CHAPTER 3 ■ OPERATORS 58 Remember
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CHAPTER 3 ■ OPERATORS 60 Using Ja
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CHAPTER 3 ■ OPERATORS 62 dough.po
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CHAPTER 3 ■ OPERATORS 64 mincedLe
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CHAPTER 3 ■ OPERATORS 66 Figure 3
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CHAPTER 3 ■ OPERATORS 68 // 1.25
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CHAPTER 3 ■ OPERATORS 78 saigonCi
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CHAPTER 3 ■ OPERATORS 94 fridge.y
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CHAPTER 4 ■ CONTROLLING FLOW 98 s
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CHAPTER 4 ■ CONTROLLING FLOW 100
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CHAPTER 5 ■ MEMBER INHERITANCE 14
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CHAPTER 6 ■ FUNCTIONS AND ARRAYS
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CHAPTER 7 ■ TRAVERSING AND MODIFY
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CHAPTER 8 ■ SCRIPTING CSS 308 Rem
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CHAPTER 9 ■ LISTENING FOR EVENTS
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Page 500 and 501: ■ INDEX 474 ■ P padJSON(), 445
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