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CHAPTER 7 ■ TRAVERSING AND MODIFYING THE DOM TREE 266 Figure 7–3. Writing the data member changes the nodeValue member, too. Note that this changes the display in Firefox. However, if you press Ctrl+U (Cmd+U) to view the XHTML markup, the link still contains "LinkedIn", as Figure 7–4 displays. So, JavaScript modifies the DOM tree floating around in memory, not the XHTML file on the server. Figure 7–4. JavaScript modifies the DOM tree, not the markup it represents.
CHAPTER 7 ■ TRAVERSING AND MODIFYING THE DOM TREE Finally, let’s try ascending cascade style with parentNode. Doing so is much simpler than descending with childNodes insofar as there are no element indexes, muddied by whitespace Text nodes, for you to worry about. So, in Firebug, click Clear in both panels, and save the "Flickr" Text node to a variable named myText. var myText = document. childNodes[1]. childNodes[1]. childNodes[1]. childNodes[3]. childNodes[5]. childNodes[0]. childNodes[0]; Then ascend from myText to the element by chaining parentNode queries. myText.parentNode. parentNode. parentNode. parentNode. parentNode. parentNode; // Verify your work with Figure 7–5. Figure 7–5. Chaining parentNode queries Note that, while ascending the DOM tree with parentNode from a Text or Element node, you will only ever pass through an Element node, and eventually you will dead end at the Document node. In Chapter 9, you will learn to lay event listener functions such as traps along this parentNode path upward through the 267
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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 30 St
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CHAPTER 2 ■ TYPE CONVERSION 32 De
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CHAPTER 2 ■ TYPE CONVERSION 36 wa
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CHAPTER 2 ■ TYPE CONVERSION 38
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CHAPTER 2 ■ TYPE CONVERSION 44 pr
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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 70 • If b
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CHAPTER 3 ■ OPERATORS 72 The impo
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CHAPTER 3 ■ OPERATORS 74 tartar:
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CHAPTER 3 ■ OPERATORS 76 } }; pur
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CHAPTER 3 ■ OPERATORS 78 saigonCi
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CHAPTER 3 ■ OPERATORS 82 loganber
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CHAPTER 3 ■ OPERATORS 92 tartar:
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CHAPTER 3 ■ OPERATORS 94 fridge.y
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CHAPTER 3 ■ OPERATORS 96
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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 8 ■ SCRIPTING CSS 316 We
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CHAPTER 8 ■ SCRIPTING CSS 320 Fig
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CHAPTER 8 ■ SCRIPTING CSS 322 Exp
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CHAPTER 8 ■ SCRIPTING CSS 324 fun
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CHAPTER 8 ■ SCRIPTING CSS 326 One
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CHAPTER 8 ■ SCRIPTING CSS 328 } L
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CHAPTER 8 ■ SCRIPTING CSS 330 •
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CHAPTER 8 ■ SCRIPTING CSS 332 ins
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CHAPTER 8 ■ SCRIPTING CSS 336 Why
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CHAPTER 8 ■ SCRIPTING CSS 340 Ref
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CHAPTER 8 ■ SCRIPTING CSS 344 } }
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CHAPTER 8 ■ SCRIPTING CSS 346
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CHAPTER 9 ■ LISTENING FOR EVENTS
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■ INDEX 462 parsing an XML respon
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■ INDEX 464 creating, 217 queryin
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■ INDEX 466 document.styleSheets,
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■ INDEX 468 listening for mousedo
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■ INDEX 470 chaining prototypes,
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■ INDEX 472 definition of, 255 de
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■ INDEX 474 ■ P padJSON(), 445
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■ INDEX 476 ten.js, 401 ternary o
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