Professional JavaScript For Web Developers

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Chapter 2 ❑ ❑ Pascal Notation — the first letter is uppercase and each appended word begins with an uppercase letter. For example: var MyTestValue = 0, MySecondTestValue = “hi”; Hungarian Type Notation — prepends a lowercase letter (or sequence of lowercase letters) to the beginning of a Pascal Notation variable name to indicate the type of the variable. For example, i means integer and s means string in the following line: var iMyTestValue = 0, sMySecondTestValue = “hi”; The following table list prefixes for defining ECMAScript variables with Hungarian Type Notation. These prefixes are used throughout the book to make sample code easier to read: Type Prefix Example Array a aValues Boolean b bFound Float (Number) f fValue Function fn fnMethod Integer (Number) i iValue Object o oType Regular Expression re rePattern String s sValue Variant (can be any type) v vValue Another interesting aspect of ECMAScript (and a major difference from most programming languages) is that variables don’t have to be declared before being used. For example: var sTest = “hello “; sTest2 = sTest + “world”; alert(sTest2); //outputs “hello world” In the previous code, sTest is declared with a string value of “hello”. The next line uses a variable named sTest2 to create a concatenation of sTest and the string “world”. The variable sTest2 hasn’t been defined using the var operator; it has just been inserted as if it has already been declared. When the ECMAScript interpreter sees an identifier that hasn’t been declared, it creates a global variable with the given name of the identifier and initializes it with the value specified. This is a handy feature of the language, but it can also be dangerous if you don’t keep track of variables closely. Best practice is always to declare all variables as you would with other programming languages (for more information on why you should always declare variables, see Chapter 19, “Deployment Issues”). 14
Keywords ECMA-262 describes a set of keywords that ECMAScript supports. These keywords indicate beginnings and/or endings of ECMAScript statements. By rule, keywords are reserved and cannot be used as variable or function names. Here is the complete list of ECMAScript keywords: break else new var case finally return void catch for switch while continue function this with default if throw delete in try do instanceof typeof ECMAScript Basics If you use a keyword as a variable or function name, you will probably be greeted with an error message like this: “Identifier expected.” Reserved Words ECMAScript also defines a number of reserved words. The reserved words are, in a sense, words that are reserved for future use as keywords. Because of this, reserved words cannot be used as variable or function names. The complete list of reserved words in ECMA-262 Edition 3 is as follows: abstract enum int short boolean export interface static byte extends long super char final native synchronized class float package throws const goto private transient debugger implements protected volatile double import public If you use a reserved word as a variable or function name, more than likely you will not receive an error...until a future browser implements one of them. Then the word will be considered a keyword, and you will get a keyword error. Primitive and Reference Values In ECMAScript, a variable can hold one of two types of values: primitive values and reference values. ❑ ❑ Primitive values are simple pieces of data that are stored on the stack, which is to say that their value is stored directly in the location that the variable accesses. Reference values, on the other hand, are objects that are stored in the heap, meaning that the value stored in the variable location is a pointer to a location in memory where the object is stored. 15
Page 3: Professional JavaScript for Web De
Page 6 and 7: Professional JavaScript for Web De
Page 8 and 9: Vice President and Executive Group
Page 11 and 12: Contents Acknowledgments Introducti
Page 13 and 14: Contents Scope 88 Public, protected
Page 15 and 16: Contents Simple Patterns 197 Metach
Page 17 and 18: Contents Chapter 10: Advanced DOM T
Page 19 and 20: Contents Chapter 14: Error Handling
Page 21 and 22: Contents Chapter 18: Interacting wi
Page 23 and 24: Introduction Although once supporte
Page 25 and 26: Introduction 2. ECMAScript Basics T
Page 27 and 28: Conventions Introduction To help yo
Page 29 and 30: What Is JavaScript? When JavaScript
Page 31 and 32: JavaScript Implementations What Is
Page 33 and 34: ECMAScript support in Web browsers
Page 35 and 36: What Is JavaScript? By creating a t
Page 37: The Browser Object Model (BOM) What
Page 40 and 41: Chapter 2 ❑ End-of-line semicolon
Page 44 and 45: Chapter 2 When a value is assigned
Page 46 and 47: Chapter 2 alert(typeof oTemp); aler
Page 48 and 49: Chapter 2 A few special values are
Page 50 and 51: Chapter 2 Converting to a string Th
Page 52 and 53: Chapter 2 The parseFloat() method w
Page 54 and 55: Chapter 2 This syntax is similar to
Page 56 and 57: Chapter 2 The toFixed() method retu
Page 58 and 59: Chapter 2 Next up is the concat() m
Page 60 and 61: Chapter 2 alert(oStringObject.subst
Page 62 and 63: Chapter 2 If you place this line of
Page 64 and 65: Chapter 2 The postfix increment and
Page 66 and 67: Chapter 2 1 0 0 1 0 (2 4 x1) + (2 3
Page 68 and 69: Chapter 2 var iResult = 25 & 3; ale
Page 70 and 71: Chapter 2 Note that left shift pres
Page 72 and 73: Chapter 2 In this example, a Boolea
Page 74 and 75: Chapter 2 Just like logical AND, if
Page 76 and 77: Chapter 2 Just like the multiplicat
Page 78 and 79: Chapter 2 var bResult = “23” <
Page 80 and 81: Chapter 2 operator to compare the s
Page 82 and 83: Chapter 2 if (i > 25) alert(“Grea
Page 84 and 85: Chapter 2 Labeled statements It is
Page 86 and 87: Chapter 2 The with statement The wi
Page 88 and 89: Chapter 2 For example: function say
Page 90 and 91: Chapter 2 The arguments object With
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Chapter 2 var doAdd = new Function(
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Chapter 2 } return iNum1 + iNum2 +
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Chapter 3 The object definition is
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Chapter 3 Types of Objects In ECMAS
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Chapter 3 The Array object override
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Chapter 3 Push onto the stack top b
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Chapter 3 They wait their turns, ev
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Chapter 3 This line creates a new D
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Chapter 3 Method setFullYear(year)
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Chapter 3 This code outputs two val
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Chapter 3 Property Error EvalError
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Chapter 3 Here, Math.E is first rai
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Chapter 3 Scope Programmers in any
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Chapter 3 In this code, the functio
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Chapter 3 Some got around this prob
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Chapter 3 Car.prototype.color = “
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Chapter 3 } } Car.prototype.showCol
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Chapter 3 StringBuffer.prototype.ap
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Chapter 3 } } } return -1; This met
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Chapter 3 Summary ECMAScript provid
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Chapter 4 Shape Ellipse Polygon Cir
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Chapter 4 All new properties and me
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Chapter 4 The apply() method The ap
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Chapter 4 ClassB.prototype.name =
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Chapter 4 In ECMAScript, the class
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Chapter 4 } Rectangle.prototype = n
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Chapter 4 the limit in an effort to
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Chapter 4 Dynamic prototyping suppo
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Chapter 4 } } ClassZ.prototype.sayM
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Chapter 4 In this case, the supercl
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Chapter 4 Rectangle.prototype.getAr
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Chapter 5 Although originally creat
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Chapter 5 ❑ ❑ Code Maintenance
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Chapter 5 on the following line. Ne
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Chapter 5 alert("A is greater
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Chapter 5 Figure 5-2 The next tag i
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Chapter 5 The Browser Object Model
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Chapter 5 Frameset Example
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Chapter 5 ❑ resizeTo(w, h) — re
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Chapter 5 As mentioned previously,
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Chapter 5 To determine if the user
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Chapter 5 Books Be careful not to o
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Chapter 5 Here, the code uses linke
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Chapter 5 you want to track where u
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Chapter 5 This code writes a tag t
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Chapter 5 The method assign() accom
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Chapter 5 Property/Method Descripti
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DOM Basics The Document Object Mode
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DOM Basics Today XML is one of the
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DOM Basics The Document Object Mode
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DOM Basics The node is considered
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DOM Basics The W3C has also publish
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DOM Basics Checking the node type Y
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Accessing specific nodes You alread
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DOM Basics To access the element w
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DOM Basics You’re not done quite
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DOM Basics This sample page replace
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DOM Basics To get and set the src a
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DOM Basics ❑ ❑ ❑ deleteCaptio
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DOM Basics Document Element html El
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DOM Basics var node3 = iterator.pre
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DOM Basics Hello World! List i
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DOM Basics var oOutput = document.g
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DOM Basics necessarily mean that th
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Chapter 7 This regular expression m
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Chapter 7 var sToChange = “The sk
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Chapter 7 This code matches the let
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Chapter 7 Note that [a-z] matches o
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Chapter 7 You can read this regular
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Chapter 7 For the second regular ex
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Chapter 7 Expressions to match lead
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Chapter 7 In this, reRedOrBlack mat
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Chapter 7 Lookaheads Sometimes you
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Chapter 7 It is, in fact, easier to
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Chapter 7 reB.exec(sToMatch); alert
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Chapter 7 Common Patterns On the We
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Chapter 7 The isValidDate() functio
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Chapter 7 } } } bIsOdd = !bIsOdd; A
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Chapter 7 Validating e-mail address
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Browser and Operating System Detect
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The important things to note in thi
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Detecting Opera The simplest and be
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Depending on which browsers you pla
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All about Events JavaScript’s int
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All about Events document 3 bubblin
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All about Events Some have also cal
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Using this method of assignment, th
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All about Events var oDiv = documen
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Properties/methods Internet Explore
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All about Events Property/Method Ty
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Detecting Shift, Alt, Ctrl To detec
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Getting the target The object at th
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All about Events When the button is
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All about Events Using the mouseove
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All about Events if (oEvent.fromEle
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All about Events Event properties F
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All about Events ❑ ❑ ❑ ❑ Th
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All about Events The actual res
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All about Events window.onscroll =
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All about Events In the second part
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All about Events DOM Property/Metho
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All about Events }; } return oEvent
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All about Events oEvent.eventPhase
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All about Events } var oTextbox = d
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Chapter 10 CSS Style Attribute back
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Chapter 10 var oDiv = document.getE
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Chapter 10 This example passes the
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Chapter 10 ❑ ❑ ❑ ❑ ❑ medi
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Chapter 10 In this example, three
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Chapter 10 } function getBackgrou
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Chapter 10 node in question. For ex
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Chapter 10 If you plan to use DOM r
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Chapter 10 Hello World oRange
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Chapter 10 ❑ setEndAfter(refNode)
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Chapter 10 Interacting with DOM ran
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Chapter 10 The following code accom
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Chapter 10 Comparing DOM ranges If
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Chapter 10 The closest thing to the
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Chapter 10 Comparing IE ranges Rang
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Forms and Data Integrity Form eleme
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Forms and Data Integrity Comments:
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Forms and Data Integrity //is the f
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You can actually mimic the behavior
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allowed in the text box. So to crea
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Forms and Data Integrity Select T
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Forms and Data Integrity }; } } } }
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Allowing/blocking characters in tex
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Forms and Data Integrity main diffe
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Forms and Data Integrity You must u
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Forms and Data Integrity You may as
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Forms and Data Integrity Because bo
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Forms and Data Integrity Even thoug
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Forms and Data Integrity This metho
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Forms and Data Integrity TextUtil.a
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Forms and Data Integrity The autosu
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Chapter 12 }; return -1; } else if
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Chapter 12 Smith Johnson Hend
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Chapter 12 This section of code cre
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Chapter 12 Smith John Johnson Bet
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Chapter 12 Last Name First Name
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Chapter 12 Creating a conversion fu
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Chapter 12 Using this methodology,
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Chapter 12 The concept Keep in mind
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Chapter 12 } }; if (vValue1 < vValu
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Drag and Drop One of the biggest im
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Drag and Drop } Try dragging th
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Drag and Drop function handleDragDr
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Drag and Drop In this example, all
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Drag and Drop This is essentially t
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Drag and Drop oEvent.dataTransfer.e
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Drag and Drop } } oEvent.srcElement
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Drag and Drop function handleMouseD
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Drag and Drop function handleMouseU
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Drag and Drop } return (iX >= iX1 &
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Drag and Drop The zDraggable object
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Drag and Drop position: absolute; l
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Chapter 14 some other reason, perha
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Chapter 14 Figure 14-2 The other op
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Chapter 14 The problem with IE/Mac
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Chapter 14 Figure 14-7 Opera 7 (all
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Chapter 14 In this example, an exce
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Chapter 14 Handling syntax errors T
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Chapter 14 Mozilla’s extensions t
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Chapter 14 Determining the type of
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Chapter 14 Note that the check for
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Chapter 14 Mozilla, Safari, and Ope
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Chapter 14 As you can see, this red
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Chapter 14 The last utility window
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Chapter 14 Figure 14-14 Foreground
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Chapter 14 Under each file (JavaScr
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Chapter 14 Figure 14-19 You also ha
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Chapter 14 Adding a watch adds a va
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XML in JavaScript With the rising p
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XML in JavaScript using the string
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Retrieving XML After you’ve gotte
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XML in JavaScript This line of code
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XML in JavaScript As long as you in
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XML in JavaScript Unfortunately, th
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XML in JavaScript try { var oXmlDom
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XML in JavaScript var oXmlDom = new
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XML in JavaScript Document.prototyp
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XML in JavaScript With this code ad
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XML in JavaScript }; } this.parseEr
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XPath support in IE Microsoft saw f
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XML in JavaScript XPathResult.ORDER
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XML in JavaScript If you feel like
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XML in JavaScript As you can see,
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XML in JavaScript Employees
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XML in JavaScript The setStartMode(
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XML in JavaScript var oProcessor =
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Chapter 16 Cookie ingredients No ch
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Chapter 16 The setCookie() function
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Chapter 16 } %> for (int i=0; i < c
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Chapter 16 The one restriction on s
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Chapter 16 Hidden Frames A trick th
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Chapter 16 } setTimeout(function ()
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Chapter 16 with the HTTP status of
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Chapter 16 Assuming that you have s
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Chapter 16 It also helps to have a
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Chapter 16 var oReader = new java.i
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Chapter 16 oConnection.setRequestPr
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Chapter 16 } else if (navigator.jav
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Chapter 16 }; }, 10); } else { aler
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Web Services In the past two years,
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Web Services xmlns=”http://schema
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Web Services The pertinent informat
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Web Services var oResult = window.e
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Enhanced privileges Contacting a di
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Web Services ❑ ❑ ❑ ❑ ❑
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Web Services Once again, the first
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Web Services } onError: function (s
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Web Services } else { alert(“Prox
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Web Services var oService = new Web
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Web Services This line of code crea
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Interacting with Plugins The Web is
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Interacting with Plugins ❑ ❑ Ac
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Detecting Plugins As with most Web
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Interacting with Plugins } document
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Interacting with Plugins if (naviga
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Interacting with Plugins Figure 18-
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Interacting with Plugins } } else {
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Interacting with Plugins } var oApp
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Interacting with Plugins This examp
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Interacting with Plugins The JSObje
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Interacting with Plugins Back to th
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JavaScript-to-Flash communication F
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Interacting with Plugins Flash Cons
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Interacting with Plugins on(release
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Interacting with Plugins Lastly
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Summary Interacting with Plugins Th
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Chapter 19 If all three of these co
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Chapter 19 The preceding code displ
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Chapter 19 If the script isn’t si
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Chapter 19 This example places the
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Chapter 19 alert(sJavaScriptHello);
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Chapter 19 takes for the script to
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Chapter 19 One of the best tools fo
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Chapter 19 Use array and object lit
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Chapter 19 (window) MyFirstName = "
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Chapter 19 Remember Computer Scienc
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Chapter 19 Keep these algorithms in
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Chapter 19 } iSum += aValues[i]; i+
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Chapter 19 iLoopCount = Math.floor(
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Chapter 19 JavaScript gotchas JavaS
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Chapter 19 Use array and object lit
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Chapter 19 Using the JavaScript com
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The Evolution of JavaScript So far
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The Evolution of JavaScript You wil
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The Evolution of JavaScript Types N
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The Evolution of JavaScript This cl
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The Evolution of JavaScript Note th
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The Evolution of JavaScript As you
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The Evolution of JavaScript var oXm
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The Evolution of JavaScript var oXm
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The Evolution of JavaScript If you
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The Evolution of JavaScript In the
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Index Index SYMBOLS + (add operator
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avoiding hard-coded strings, 569-57
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close() method of document object,
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Konqueror/Safari, 239-241 language,
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try...catch statement, 423-427 vari
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F factory paradigm, 90-92 findPlugi
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history of browser window, 148 of J
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XML DOM support in Mozilla and, 455
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getAllResponseHeaders(), 495 getCom
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findPlugin() function, 538 helper a
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parsing error description of, 412-4
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eferences to object, 69 referencing
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size of array, 71 slice() method Ar
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MIME type, 537-538 range collapse,
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vector graphics, 133 Venkman breakp
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