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■ PREFACE xxii editor reappear. Note that the keyboard shortcut for toggling to the Console tab is Ctrl+Shift+L (Command+Shift+L). Table 1 lists vital keyboard shortcuts for Firebug. Table 1. Firebug Keyboard Shortcuts Shortcut Description Windows or Linux Mac Open Firebug F12 F12 Close Firebug F12 F12 Toggle to Console tab Ctrl+Shift+L Command+Shift+L Run code in command editor Ctrl+Return Command+Return If you are a fallible typist, inevitably you will mistype a code sample. Consequently, when you click Run, JavaScript will print an error in the left panel of Firebug. Those are simply JavaScript’s way of calling you a dummy. Syntax and reference errors are the most common. JavaScript names those SyntaxError and ReferenceError, respectively. So, let’s screw up in both ways now to get you off the schneid with errors. In Firebug, mistype alert as alrt in order to make a reference error, which is to say you mistyped the name of something: alrt("Don't Panic"); As Figure 10 displays, JavaScript prints a ReferenceError containing the message "alrt is not defined": Figure 10. OopsJavaScript returns a ReferenceError saying "alrt is not defined".
OK, fix that typo, reverting alrt to alert, and then delete the closing parentheses like so: alert("Don't Panic"; Now click Run. As Figure 11 displays, JavaScript prints a SyntaxError containing the message "missing ) after argument list". Note that a syntax error in programming is like a grammar error in writing. Figure 11. OopsJavaScript returns a SyntaxError saying "missing ) after argument list". Don’t panic if you get an error. It probably just means you need to fix a typo or two. Now that you have installed and gained familiarity with Firebug, let’s begin exploring ECMAScript! ■ PREFACE xxiii
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 18 and 19: ■ PREFACE xvi Preface In the 2005
Page 20 and 21: ■ PREFACE xviii Opening Firebug L
Page 22 and 23: ■ PREFACE xx Now press Return on
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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 48 Fi
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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 318 Don
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CHAPTER 8 ■ SCRIPTING CSS 322 Exp
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CHAPTER 8 ■ SCRIPTING CSS 324 fun
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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 330 •
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CHAPTER 8 ■ SCRIPTING CSS 332 ins
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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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