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CHAPTER 10 ■ SCRIPTING BOM 438 function parseSimpleXML(req) { if (req.status === 200 || req.status === 304) { } prep(); } Next? Right again. Save the DOM tree for our XML to a local variable named domTree, just like we did in parseXML(). function parseSimpleXML(req) { if (req.status === 200 || req.status === 304) { var domTree = req.responseXML; } prep(); } And now? Yup, save the nine elements to a local variable, the same as for parseXML(). function parseSimpleXML(req) { if (req.status === 200 || req.status === 304) { var domTree = req.responseXML; var elements = domTree.getElementsByTagName("shoe"); } prep(); } Note that if you are testing this script on your computer, which is to say loading URLs with the file:// protocol, there obviously will not be an http:// status code. XMLHttpRequest.status will always be 0, no matter what. With this in mind, if you are testing the script on your computer, you must replace 200 or 304 with 0. Otherwise, the if block will never run! function parseSimpleXML(req) { if (req.status === 0 || req.status === 304) { var domTree = req.responseXML; var elements = domTree.getElementsByTagName("shoe"); } prep(); } Do you remember how to query a custom attribute for an element? We can’t use the . or [] operators. Rather, we need to call Element.getAttribute(), a method defined by each element. For example, to query the href attribute, we’d write this: elements[i].getAttribute("href") The same thing goes for the src and alt attributes: elements[i].getAttribute("src") elements[i].getAttribute("alt") Even that is less verbose than for traditional XML. Anyway, with this in mind, we can cobble together a scroller with our helper function, createElem(), like so: function parseSimpleXML(req) { if (req.status === 200 || req.status === 304) { var domTree = req.responseXML;
CHAPTER 10 ■ SCRIPTING BOM var elements = domTree.getElementsByTagName("shoe"); var div, ul = createElem("ul", {className: "slide"}), li; for (var i = 0, j = elements.length; i < j; i ++) { li = createElem("li", null, [ createElem("a", {href: elements[i].getAttribute("href")}, [ createElem("img", {src: elements[i].getAttribute("src"), alt: elements[i].getAttribute("alt")})])]); ul.appendChild(li); } div = createElem("div", {className: "scroller", id: "s4"}, [ createElem("div", {className: "wrapper"}, [ul]), createElem("div", {className: "left arrow sprite"}), createElem("div", {className: "right arrow sprite"})]); } prep(); } Now the local variable contains the following DOM branch: But it’s in memory, invisible to visitors. How would you fix that? Yep, put the DOM branch on the tree: function parseSimpleXML(req) { if (req.status === 200 || req.status === 304) { var domTree = req.responseXML; var elements = domTree.getElementsByTagName("shoe"); var div, ul = createElem("ul", {className: "slide"}), li; for (var i = 0, j = elements.length; i < j; i ++) { li = createElem("li", null, [ 439
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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 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 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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