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CHAPTER 8 ■ SCRIPTING CSS 312 text-indent:-9999px; text-decoration:none; overflow:hidden; } ul.blue a { background-image:url(images/blue.gif); } ul.fuchsia a { background-image:url(images/fuchsia.gif); } ul.green a { background-image:url(images/green.gif); } a#adidas { top:30px; background-position:0 0; } a#asics { top:65px; background-position:0 -27px; } a#brooks { top:100px; background-position:0 -54px; } a#newBalance { top:135px; background-position:0 -81px; } a#nike { top:170px; background-position:0 -108px; } a#saucony { top:205px; background-position:0 -135px; } Finally, download the sprite images: blue.gif, fuchsia.gif, and green.gif. Download the background image, container.gif, too. Put those four images in a folder aptly named images within the folder you put eight.html and eight.css in. If you are unfamiliar with sprites, they work by sliding an image to different coordinates by way of the CSS property background-position. As Figure 8–1 illustrates, this enables us to combine all 12 link images into a single image, which improves load time.
Figure 8–1. The blue sprite contains all 12 button images. Querying a Style Attribute CHAPTER 8 ■ SCRIPTING CSS Open eight.html in Firefox, and then press F12 to enable Firebug. If you’re just joining us, flip back to the preface for details on how to do this. Now let’s try querying the style attribute for the Nike link. Insofar as its markup tag does not contain a style attribute, ElementCSSInlineStyle.style will contain a bunch of "" empty strings. That makes this a pretty dull read. Nevertheless, take a peek at some CSS properties: var myStyle = document.getElementById("nike").style; myStyle.backgroundPosition; // "" myStyle.backgroundImage; // "" myStyle.left; // "" myStyle.top; // "" As Figure 8–2 displays, JavaScript returns one "" empty string after another. If you abide by the separation of markup content from CSS presentation credo, this will be the case for every Element node in the DOM tree—at least initially. 313
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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 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 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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■ 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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■ INDEX 476 ten.js, 401 ternary o
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