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CHAPTER 8 ■ SCRIPTING CSS 342 Figure 8–15. Delete the element with removeChild(), and Firefox redisplays the document as unstyled markup. By the way, even though it may be obvious, note that passing a or to removeChild() does the inverse of what addSheet() does. So, removing a style sheet is simpler than adding one. Now that our document is totally unstyled, we can tangibly test addSheet(). Let’s first try to include eight.css with a new . Go ahead and delete the removeChild() invocation. Then call addSheet() like so, verifying your work with Figure 8–16. function addSheet(tag, url) { var element = document.createElement(tag); element.type = "text/css"; document.getElementsByTagName("head")[0].appendChild(element); if (tag === "link") { element.rel = "stylesheet"; element.href = url; } else if (tag === "style") { try { element.sheet.insertRule("@import url(" + url + ")", 0); } catch (whyNot) { element.styleSheet.addImport(url); }
} } addSheet("link", "eight.css"); Figure 8–16. Dynamically including eight.css with addSheet() CHAPTER 8 ■ SCRIPTING CSS Did Firefox restyle your document with the blue sprite? Great. Now let’s again remove the with removeChild(). Then insert a with an @import directive with the help of addSheet(). Doing so restyles the document, too. function addSheet(tag, url) { var element = document.createElement(tag); element.type = "text/css"; document.getElementsByTagName("head")[0].appendChild(element); if (tag === "link") { element.rel = "stylesheet"; element.href = url; } else if (tag === "style") { try { element.sheet.insertRule("@import url(" + url + ")", 0); } catch (whyNot) { element.styleSheet.addImport(url); 343
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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 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 7 ■ TRAVERSING AND MODIFY
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CHAPTER 9 ■ LISTENING FOR EVENTS
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CHAPTER 10 ■ SCRIPTING BOM 400 Ne
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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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■ INDEX 478
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