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CHAPTER 9 ■ LISTENING FOR EVENTS 398
C H A P T E R 10 ■ ■ ■ Scripting BOM A while ago, I worked a scene in the Russell Crowe and Liam Neeson film The Next Three Days. Probably the thing that surprised me most was how dynamic things were on set. Paul Haggis, who won two Oscars for Crash, kept reworking the content of the scene, especially the timing; he must have had Jason Beghe (Detective Quinn) run out of every single door in the precinct and say, “We found his son!” each time. Oftentimes Haggis would tell us what to do just moments before filming another take. Needless to say, having a good short-term memory was vital. Now in JavaScript, those things (dynamic content, timing, short-term memory) are the purview of the Browser Object Model (BOM). For dynamic content, there’s XMLHttpRequest, an object for loading data at runtime without having to refresh the page, a technique called Ajax. Then for timing things like animations, BOM provides four timer functions: setTimeout(), setInterval(), clearTimeout(), and clearInterval(). Finally, in order to give a browser a memory, BOM provides cookies. You might have heard of those. In this chapter, Ajax, timers, and cookies are on the docket. These are pretty disparate features, but that’s the way with BOM, which isn’t a standard, but rather a hodgepodge of initially proprietary features that are now implemented by Internet Explorer, Firefox, Safari, and Opera. For example, XMLHttpRequest began life as a proprietary Internet Explorer feature. Downloading the Project Files Prior to rolling up our sleeves and coding, download the project files from www.apress.com. There are quite a few of them this time. Let’s take a peek at the markup in ten.html, displayed here. Later in the chapter, we will turn the branch of the DOM tree beginning with into an animated gallery. Then we’ll dynamically add additional galleries by way of Ajax. Getting StartED with JavaScript Running adidas ASICS Brooks 399
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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 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 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 8 ■ SCRIPTING CSS 308 Rem
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CHAPTER 8 ■ SCRIPTING CSS 312 tex
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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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