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CHAPTER 4 ■ CONTROLLING FLOW 112 // "Number 92 is Harrison." Verify your work with Figure 4–6. Figure 4–6. Falling through from one case clause to another JavaScript fell through from the case clause for 92 to the one for 97. Now let’s be ornery, omit some break statements, and see what happens: var jersey = 7, name = ""; switch (jersey) { case 7: name = "Roethlisberger"; case 10: name = "Holmes"; case 17: name = "Wallace"; case 34: name = "Mendenhall"; case 43: name = "Polamalu"; case 83:
CHAPTER 4 ■ CONTROLLING FLOW name = "Miller"; break; case 86: name = "Ward"; break; case 92: case 97: name = "Harrison"; break; case 94: name = "Timmons"; break; case 96: name = "Hood"; break; default: name = "not worn by any Steeler"; break; } "Number " + jersey + " is " + name + "."; // "Number 7 is Miller." Here, JavaScript begins running the switch block with the statement name = "Roethlisberger"; and stops when it encounters the break statement after the statement name = "Miller";, so for a jersey number of 7, JavaScript incorrectly returns "Miller". Put another way, JavaScript just ran a path like the one for the following ridiculous if condition, which overwrites name six times in a row! if (jersey === 7) { name = "Roethlisberger"; name = "Holmes"; name = "Wallace"; name = "Mendenhall"; name = "Polamalu"; name = "Miller"; } Now put the break statements back in, change jersey to 96, and delete the break after the case clause for 96. Click Run to see what happens: var jersey = 96, name = ""; switch (jersey) { case 7: name = "Roethlisberger"; break; case 10: name = "Holmes"; break; case 17: name = "Wallace"; break; case 34: name = "Mendenhall"; break; case 43: name = "Polamalu"; 113
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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 32 De
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CHAPTER 2 ■ TYPE CONVERSION 38
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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 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 344 } }
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CHAPTER 8 ■ SCRIPTING CSS 346
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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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