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CHAPTER 8 ■ SCRIPTING CSS 344 } } } document.getElementsByTagName("head")[0]. removeChild(document.getElementsByTagName("link")[0]);addSheet("style", "eight.css"); Embedding a Style Sheet Sometimes you may want to embed a style sheet in a new element rather than including or importing one. Insofar as the newly minted is empty, the simplest way to embed a style sheet is to create a Text node containing all the rules and then insert it into the with appendChild(). It works fine for Firefox, Safari, and Opera, but not for Internet Explorer. There’s a workaround, though. In Internet Explorer, styleSheet has a cssText member. Rather than create a Text node from our string of CSS rules, we will simply assign the string to cssText. With those brave words, let’s code a helper function named embedSheet(). This one works with one parameter, a string of CSS rules. The fork in the road where Firefox, Safari, and Opera and Internet Explorer part company will be formed from a try catch statement: function embedSheet(text) { var element = document.createElement("style"); element.type = "text/css"; document.getElementsByTagName("head")[0].appendChild(element); text = document.createTextNode(text); try { element.appendChild(text); } catch (whyNot) { element.styleSheet.cssText = text.data; } } Now let’s test embedSheet() by passing in a couple of rules that will change the sprite from blue to fuchsia and move the interface to the right. Enter and run the following, and then verify your work with Figure 8–17: function embedSheet(text) { var element = document.createElement("style"); element.type = "text/css"; document.getElementsByTagName("head")[0].appendChild(element); text = document.createTextNode(text); try { element.appendChild(text); } catch (whyNot) { element.styleSheet.cssText = text.data; } } embedSheet("ul.blue a {background-image:url(images/fuchsia.gif);} div#running {left:500px;}");
Figure 8–17. Dynamically embedding a style sheet with embedSheet() Summary CHAPTER 8 ■ SCRIPTING CSS In this chapter, we explored a number of DOM interfaces for scripting CSS, while in Chapter 7 we explored the interfaces for scripting markup. Now you know how to do what JavaScript behaviors do. You can change the presentation or content of a document. Controlling when those changes occur is the topic of the next chapter. There we will explore event interfaces provided by DOM and Internet Explorer. See you there! 345
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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 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 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 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 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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