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CHAPTER 8 ■ SCRIPTING CSS 316 We’re good with querying CSS2Properties members. Now let’s take a peek at CSSStyleDeclaration.cssText. Clear both Firebug panels, but do not refresh Firefox. This leaves our scripted styles in place so cssText has something for us to read other than an "" empty string. Enter and run the following, verifying your work with Figure 8–4: myStyle.cssText; // "background-position: -99px -108px; background-image: url("images/fuchsia.gif"); left: 200px; top: 30px;" Figure 8–4. Querying CSSStyleDeclaration.cssText cssText contains the CSS text of the style attribute. Imagine that. Now take a peek at cssText for the adidas link: document.getElementById("adidas").style.cssText; // "" It’s just a dull "" empty string. If you fully separate CSS from markup, reading cssText will be as mind-numbing as reading CSS2Properties members—unless you have a thing for "" empty strings. On the other hand, writing cssText provides a way to change several CSS properties in one fell swoop. Want to try doing that? Me too. Refresh Firefox, clear Firebug, and then enter and run the following sample. Note that the second statement wraps to two lines in this book but should be keyed in as one line in Firebug:
CHAPTER 8 ■ SCRIPTING CSS var myStyle = document.getElementById("brooks").style; myStyle.cssText = "background-image:url(images/fuchsia.gif);left:210px;top:0;paddingleft:99px;height:55px"; That did in one assignment statement what would have taken five with CSS2Properties members. Now for the tricky part: writing cssText wipes away any previous inline style declarations. With this in mind, click Clear in Firebug, but do not refresh Firefox, and then enter the following assignment; however, before clicking Run, take a guess at what will happen. You get a Smiley Cookie if you get it right. myStyle.cssText = "background-image:url(images/fuchsia.gif)"; ■ Note Smiley Cookies are a Pittsburgh institution. If you want to try them, visit www.eatnpark.com, and click the Create your own Smiley Cookies! link. Trust me, you’ll love them. Does your guess correspond to Figure 8–5? Figure 8–5. Any declarations you write to cssText totally overwrite those already in there. 317
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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 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 78 saigonCi
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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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■ 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 474 ■ P padJSON(), 445
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