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Chapter 14: Error Handling and Debugging When a JavaScript error occurs, it gets logged as an error with an error message, the URL on which the error occurred, and the line number. Clicking the filename opens a read - only view of the script that caused the error with the offending line highlighted. Firebug, arguably the most popular browser add-on for web developers, augments the default Firefox JavaScript error behavior. Firebug, available at www.getfirebug.com , adds an area in the bottom - right Firefox status bar for JavaScript information. By default, a green checkmark icon is displayed in this location. The icon changes to a red X when a JavaScript error occurs as well as displaying the number of errors. Clicking the red X opens the Firebug console, which displays the error message, the line of code that caused the error (out of context), the URL where the error occurred, and the line number (see Figure 14 - 5 ). Figure 14-5 When the line that caused the error is clicked in Firebug, it opens a new Firebug view with the line highlighted in the context of the entire script file. 468
Chapter 14: Error Handling and Debugging Firebug has many more uses beyond displaying error messages. It is a full - featured debugging environment for Firefox, providing ways to debug JavaScript, CSS, the DOM, and network information. Safari Safari on both Windows and Mac OS hide all JavaScript error information by default. In order to get access to this information, you must enable the Develop menu. To do so, choose Edit Preferences and then click the Advanced tab. There is a check box entitled “ Show develop menu in menubar ” that should be checked. Once the setting is enabled, a menu named “ Develop ” appears in the Safari menu bar (see Figure 14 - 6 ). Figure 14-6 469
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Wrox Programmer to Programmer TM Pr
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Professional JavaScript ® for Web
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Dedicated to my family: mom, dad, G
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Acquisitions Director Jim Minatel S
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Contents Foreword Introduction xxvi
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Contents Garbage Collection 90 Mark
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Contents The location Object 216 Qu
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Contents Mutation Events 402 Propri
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Contents XSLT Support in Browsers 5
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Contents Performance 647 Be Scope-A
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Foreword JavaScript, for much of it
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Introduction Some claim that JavaSc
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Introduction Chapter 4, Variables,
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Introduction ❑ C ode is presented
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Chapter 1: What Is JavaScript? even
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Chapter 1: What Is JavaScript? ECMA
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Chapter 1: What Is JavaScript? As o
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Chapter 1: What Is JavaScript? It w
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Chapter 1: What Is JavaScript? Prim
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JavaScript in HTML The introduction
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Chapter 2: JavaScript in HTML In th
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Chapter 2: JavaScript in HTML For i
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Chapter 2: JavaScript in HTML Netsc
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Chapter 2: JavaScript in HTML The v
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Language Basics At the core of any
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Statements Chapter 3: Language Basi
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Chapter 3: Language Basics It ’ s
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Chapter 3: Language Basics In this
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Chapter 3: Language Basics Though t
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Chapter 3: Language Basics Floating
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Chapter 3: Language Basics ❑ ❑
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Chapter 3: Language Basics Most of
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The Nature of Strings Chapter 3: La
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Chapter 3: Language Basics Moving t
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Chapter 3: Language Basics }; } s1
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Chapter 3: Language Basics When app
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Bitwise XOR Chapter 3: Language Bas
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Unsigned Right Shift Chapter 3: Lan
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Multiply Chapter 3: Language Basics
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Chapter 3: Language Basics If, howe
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Chapter 3: Language Basics The foll
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The while Statement Chapter 3: Lang
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Chapter 3: Language Basics Here, th
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Chapter 3: Language Basics this, nu
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Chapter 3: Language Basics The equi
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Chapter 3: Language Basics The outp
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Chapter 3: Language Basics This exa
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Chapter 3: Language Basics Function
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Chapter 4: Variables, Scope, and Me
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Reference Types A reference value (
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Chapter 5: Reference Types literals
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Chapter 5: Reference Types of this
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Chapter 5: Reference Types calls ea
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Queue Methods Chapter 5: Reference
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Chapter 5: Reference Types This com
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Chapter 5: Reference Types Perhaps
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Chapter 5: Reference Types //Januar
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Chapter 5: Reference Types The outp
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The RegExp Type Chapter 5: Referenc
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Chapter 5: Reference Types Literal
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Chapter 5: Reference Types matches
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Chapter 5: Reference Types This cod
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Chapter 5: Reference Types The last
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Functions as Values Chapter 5: Refe
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Chapter 5: Reference Types In this
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Chapter 5: Reference Types scope, w
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Chapter 5: Reference Types The roun
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String - Manipulation Methods Chapt
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Chapter 5: Reference Types starts s
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Chapter 5: Reference Types Sequence
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Chapter 5: Reference Types URI (suc
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Global Object Properties Chapter 5:
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Chapter 5: Reference Types The meth
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Chapter 5: Reference Types Method D
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Object - Oriented Programming Objec
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Chapter 6: Object-Oriented Programm
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alert(person2.name); //”Nicholas
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Dynamic Nature of Prototypes Chapte
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Durable Constructor Pattern Chapter
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Working with Methods Chapter 6: Obj
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Anonymous Functions An anonymous fu
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Chapter 7: Anonymous Functions Reca
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Chapter 7: Anonymous Functions cont
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Chapter 7: Anonymous Functions a cl
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Mimicking Block Scope Chapter 7: An
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Chapter 7: Anonymous Functions In t
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Chapter 7: Anonymous Functions The
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Chapter 7: Anonymous Functions ther
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Chapter 7: Anonymous Functions If t
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The Browser Object Model Though ECM
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Chapter 8: The Browser Object Model
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Chapter 9: Client Detection 230 For
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Chapter 9: Client Detection This co
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Chapter 9: Client Detection This st
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Chapter 9: Client Detection String
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Chapter 9: Client Detection Konquer
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Chapter 9: Client Detection Working
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Chapter 9: Client Detection WebKit
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Chapter 9: Client Detection The Gec
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Chapter 9: Client Detection This co
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Chapter 9: Client Detection (contin
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Chapter 9: Client Detection The fir
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Chapter 9: Client Detection much in
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The Document Object Model The Docum
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The Node Type Chapter 10: The Docum
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Chapter 10: The Document Object Mod
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The Document Type Chapter 10: The D
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Document Writing Chapter 10: The Do
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The Element Type Chapter 10: The Do
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Creating Elements Chapter 10: The D
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The outerText Property Chapter 10:
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Working with the DOM Chapter 10: Th
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Chapter 11: DOM Levels 2 and 3 Simi
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Chapter 11: DOM Levels 2 and 3 When
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Chapter 11: DOM Levels 2 and 3 ❑
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Chapter 11: DOM Levels 2 and 3 The
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Chapter 11: DOM Levels 2 and 3 DOM
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Chapter 11: DOM Levels 2 and 3 (the
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Chapter 11: DOM Levels 2 and 3 Assu
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Chapter 11: DOM Levels 2 and 3 Elem
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Chapter 11: DOM Levels 2 and 3 offs
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Chapter 11: DOM Levels 2 and 3 (con
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Chapter 11: DOM Levels 2 and 3 1 Do
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Chapter 11: DOM Levels 2 and 3 Typi
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Chapter 11: DOM Levels 2 and 3 to s
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Chapter 11: DOM Levels 2 and 3 Alon
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Chapter 11: DOM Levels 2 and 3 Comp
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Events JavaScript ’ s interaction
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Chapter 12: Events All modern brows
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Chapter 12: Events When this button
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Chapter 12: Events To add an event
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Chapter 12: Events The attachEvent(
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Chapter 12: Events The addHandler()
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Chapter 12: Events When the button
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The Internet Explorer Event Object
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Cross - Browser Event Object Chapte
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Event Types Chapter 12: Events Ther
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Chapter 12: Events Client Area (cli
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Modifier Keys Chapter 12: Events Ev
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Chapter 12: Events As with the prev
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Additional Event Information Chapte
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Chapter 12: Events Keyboard events
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Character Codes Chapter 12: Events
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Chapter 12: Events Keyboard events
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Chapter 12: Events This example dis
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The unload Event Chapter 12: Events
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Chapter 12: Events ❑ ❑ ❑ ❑
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Chapter 12: Events Safari 3 and Chr
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Chapter 12: Events value of the nod
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Chapter 12: Events then added to th
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Chapter 12: Events This code uses t
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The DOMContentLoaded Event Chapter
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Chapter 12: Events The readystatech
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Page 471 and 472: Scripting Forms One of the original
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Page 523 and 524: Communication Errors Chapter 14: Er
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Chapter 15: XML in JavaScript If a
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Chapter 15: XML in JavaScript (cont
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Chapter 15: XML in JavaScript As wi
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Chapter 15: XML in JavaScript In Ch
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Chapter 15: XML in JavaScript You s
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Chapter 15: XML in JavaScript Cross
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Chapter 15: XML in JavaScript XPath
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Chapter 15: XML in JavaScript If yo
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Chapter 15: XML in JavaScript Names
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Chapter 15: XML in JavaScript This
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Chapter 15: XML in JavaScript (cont
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Chapter 15: XML in JavaScript using
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Chapter 15: XML in JavaScript This
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Chapter 15: XML in JavaScript The t
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Chapter 15: XML in JavaScript Using
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Chapter 16: ECMA Script for XML so
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Chapter 16: ECMA Script for XML Not
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Chapter 16: ECMA Script for XML Thi
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Chapter 16: ECMA Script for XML You
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Chapter 16: ECMA Script for XML It
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Chapter 16: ECMA Script for XML XML
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Chapter 16: ECMA Script for XML Fir
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Chapter 16: ECMA Script for XML By
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Chapter 16: ECMA Script for XML If
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Ajax and JSON In 2005, Jesse James
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Chapter 17: Ajax and JSON } } argum
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Chapter 17: Ajax and JSON ❑ ❑ 3
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Chapter 17: Ajax and JSON Headers c
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Chapter 17: Ajax and JSON Without i
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Chapter 17: Ajax and JSON For prope
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Chapter 17: Ajax and JSON All XDR r
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Chapter 17: Ajax and JSON alert(xhr
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Chapter 17: Ajax and JSON Because t
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Chapter 17: Ajax and JSON JSON is a
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Summary Chapter 17: Ajax and JSON A
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Chapter 18: Advanced Techniques In
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Chapter 18: Advanced Techniques (co
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Chapter 18: Advanced Techniques Laz
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Chapter 18: Advanced Techniques Fun
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Chapter 18: Advanced Techniques Cur
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Chapter 18: Advanced Techniques Fir
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Chapter 18: Advanced Techniques Thi
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Chapter 18: Advanced Techniques Som
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Chapter 18: Advanced Techniques Thi
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Chapter 18: Advanced Techniques Cus
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Chapter 18: Advanced Techniques Fig
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Chapter 18: Advanced Techniques Tim
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Chapter 19: Client - Side Storage T
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Chapter 19: Client - Side Storage s
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Chapter 19: Client - Side Storage s
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Chapter 19: Client - Side Storage (
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Chapter 19: Client - Side Storage L
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Chapter 20: Best Practices What Is
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Chapter 20: Best Practices initiali
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Chapter 20: Best Practices HTML and
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Chapter 20: Best Practices A better
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Chapter 20: Best Practices Many Jav
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Chapter 20: Best Practices Realisti
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Chapter 20: Best Practices Geoffrey
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Chapter 20: Best Practices Choose t
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Chapter 20: Best Practices 3. Simpl
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Chapter 20: Best Practices (continu
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Chapter 20: Best Practices In stron
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Chapter 20: Best Practices This cod
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Chapter 20: Best Practices The key
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Chapter 20: Best Practices This bui
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Chapter 20: Best Practices File Com
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Upcoming API s With the flurry of i
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Chapter 21: Upcoming API s This exa
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Chapter 21: Upcoming API s These pr
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Chapter 21: Upcoming API s Using th
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Chapter 21: Upcoming API s Cross -
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Chapter 21: Upcoming API s Property
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Chapter 21: Upcoming API s You can
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Drawing Rectangles Chapter 21: Upco
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Chapter 21: Upcoming API s var draw
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Chapter 21: Upcoming API s Figure 2
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Chapter 21: Upcoming API s Transfor
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Chapter 21: Upcoming API s restore(
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Chapter 21: Upcoming API s The navi
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Chapter 21: Upcoming API s When a q
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Chapter 21: Upcoming API s At the m
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Chapter 21: Upcoming API s The data
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Chapter 21: Upcoming API s open, or
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The Evolution of JavaScript With th
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Chapter 22: The Evolution of JavaSc
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JavaScript 1.7 Chapter 22: The Evol
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Expression Closures Chapter 22: The
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JavaScript 1.9 Chapter 22: The Evol
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Rest Arguments Chapter 22: The Evol
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Defining Types Chapter 22: The Evol
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Class Prototypes Chapter 22: The Ev
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Error Type Detection Chapter 22: Th
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Keyword Usage Chapter 22: The Evolu
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Object Lock - Down Methods Chapter
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Decimal Operations Chapter 22: The
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Decimal Conversions Chapter 22: The
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Appendix A: JavaScript Libraries Pr
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Appendix A: JavaScript Libraries qo
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JavaScript Tools Writing JavaScript
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Venkman Appendix B: JavaScript Tool
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Dojo ShrinkSafe Appendix B: JavaScr
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Appendix B: JavaScript Tools simila
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asynchronous XHR requests asynchron
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client-side storage (continued) cli
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debugging tools, Firebug (continued
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drag and drop, in HTML 5 drag and d
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event listeners. See event handlers
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forms, scripting forms, scripting,
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IE (Internet Explorer) (continued)
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JavaScript/CSS JavaScript/CSS, 640-
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mutation events mutation events, 40
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parsing XML parsing XML, 528-529 wi
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Rhino JavaScript Rhino JavaScript,
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String data types String data types
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unit testers unit testers Dojo Obje
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XML DOM support, in browsers XML DO
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Programmer to Programmer Get more o
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