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■ PREFACE xvi Preface In the 2005 film adaptation of The Hitchhiker’s Guide to the Galaxy by Douglas Adams, aliens demolish the earth to make way for a hyperspace expressway. Our demise could have been averted insofar as the demolition proposal had been on file at local planning offices worldwide for some time. However, no one complained during the public comment period. Like construction proposals, no one ever bothers to read the preface to a programming book. Typically, that’s mostly harmless, but not for this book. Though you won’t be vaporized into star dust for jumping to Chapter 1 or later, you’ll be befuddled for not having downloaded and familiarized yourself with Firebug, our tool for learning JavaScript. JavaScript is a beginner-friendly programming language available in browsers such as Internet Explorer, Firefox, Safari, Opera, and Chrome. Those browsers contain a JavaScript interpreter to parse and run your JavaScript programs, which you write in plain text with a text editor. So, you can use the same text editor that you code your XHTML and CSS with. JavaScript derives its syntax, which is to say its grammar, from the ECMAScript standard and its features for manipulating XHTML, CSS, and HTTP from the DOM standard. Typically, JavaScript interpreters implement ECMAScript and DOM in separate libraries. So, just as your brain has left and right lobes, a browser’s JavaScript brain has ECMAScript and DOM lobes. In the first six chapters, we’ll converse with the ECMAScript lobe. Then we’ll converse with the DOM lobe for a couple of chapters. I guess you could say we’ll be picking a JavaScript’s brain one lobe at a time—ECMAScript and then DOM, with Firebug. Finally, in the last two chapters, we’ll hand-code an uber-cool JavaScript program with our preferred text editors. But we’ll never make it through Chapters 1–8 without Firebug. So, our first order of business will be to have you download and familiarize yourself with Firebug, a free add-on to Firefox for Windows, Mac, or Linux. Obviously, prior to installing a Firefox add-on like Firebug, you need to have Firefox. Note that Firefox is a free web browser for Windows, Mac OS X, or Linux. To download Firefox, go to www.mozilla.com, and click the Download Firefox – Free button, as displayed in Figure 1. Then follow the wizard to install Firefox on your computer. Open Firefox, and then download the Firebug add-on from www.getfirebug.com. Simply click Install Firebug for Firefox button in the top-right corner, as shown in Figure 2. Then follow the wizard, granting permission to install the add-on if prompted by Firefox.
Figure 1. Downloading Firefox for Windows, Mac OS X, or Linux Figure 2. Downloading the Firebug add-on Now that you have Firefox and Firebug installed, let’s run through how to work with Firebug. Firebug runs JavaScript code relative to whatever HTML document is loaded in Firefox. In other words, you need to have an HTML document open in Firefox for Firebug to work. Insofar as ECMAScript provides no way to manipulate HTML or CSS, in Chapters 1–6 we will simply load the following blank HTML document, firebug.html in the downloads at www.apress.com, in Firefox: Firebug xvii
Page 1: THE EXPERT’S VOICE ® IN WEB DEVE
Page 4 and 5: ii JavaScript for Absolute Beginner
Page 6 and 7: iv Contents at a Glance ■Contents
Page 8 and 9: ■ CONTENTS vi ■Chapter 2: Type
Page 10 and 11: ■ CONTENTS viii Sharing a Prototy
Page 12 and 13: ■ CONTENTS x Querying Attributes
Page 14 and 15: ■ CONTENTS xii Getting the User
Page 16 and 17: ■ CONTENTS xiv About the Technica
Page 20 and 21: ■ PREFACE xviii Opening Firebug L
Page 22 and 23: ■ PREFACE xx Now press Return on
Page 24 and 25: ■ PREFACE xxii editor reappear. N
Page 26 and 27: ■ PREFACE xxiv
Page 28 and 29: CHAPTER 1 ■ REPRESENTING DATA WIT
Page 52 and 53: CHAPTER 2 ■ TYPE CONVERSION 26 Fi
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CHAPTER 2 ■ TYPE CONVERSION 42 Fi
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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 74 tartar:
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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 8 ■ SCRIPTING CSS 308 Rem
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CHAPTER 8 ■ SCRIPTING CSS 310 var
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CHAPTER 8 ■ SCRIPTING CSS 312 tex
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CHAPTER 8 ■ SCRIPTING CSS 314 Fig
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CHAPTER 8 ■ SCRIPTING CSS 316 We
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CHAPTER 8 ■ SCRIPTING CSS 322 Exp
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CHAPTER 8 ■ SCRIPTING CSS 326 One
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CHAPTER 8 ■ SCRIPTING CSS 328 } L
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CHAPTER 8 ■ SCRIPTING CSS 336 Why
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CHAPTER 8 ■ SCRIPTING CSS 340 Ref
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CHAPTER 8 ■ SCRIPTING CSS 344 } }
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CHAPTER 8 ■ SCRIPTING CSS 346
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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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