Professional JavaScript For Web Developers

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Chapter 5 To determine if the user clicked OK or Cancel, the confirm() method returns a Boolean value: true if OK was clicked, false if Cancel was clicked. Typical usage of a confirm dialog usually looks like this: if (confirm(“Are you sure? “)) { alert(“I’m so glad you’re sure! “); } else { alert(“I’m sorry to hear you’re not sure. “); } In this example, the confirm dialog is displayed to the user in the first line, which is a condition of the if statement. If the user clicks OK, an alert is displayed saying, “I’m so glad you’re sure!” If, however, the Cancel button is clicked, an alert is displayed saying, “I’m sorry to hear you’re not sure.” This type of construct is often used when the user tries to delete something, such as an e-mail in his or her inbox. The final dialog is displayed by calling prompt(), and as you might expect, this dialog prompts for input from the user. Along with OK and Cancel buttons, this dialog also has a text box where the user is asked to enter some data. The prompt() method accepts two arguments: the text to display to the user and the default value for the text box (which can be an empty string if you so desire). The following line results in the window displayed in Figure 5-8 being shown: prompt(“What’s your name? “, “Michael”); Figure 5-8 The value in the text box is returned as the function value if the OK button is clicked; if the Cancel button is clicked, null is returned. The prompt() method is often used like this: var sResult = prompt(“What is your name? “, “”); if (sResult != null) { alert(“Welcome, “ + sResult); } I have a few final points to cover regarding these three dialogs. First, all the dialog windows are system windows, meaning that they may appear different on different operating systems (and sometimes, on different browsers). This also means that you have no control over the display of the window in terms of fonts, colors, and so on. Second, the dialogs are all modal, meaning that the user cannot do anything else in the browser until the dialog is dismissed by clicking the OK button or Cancel buttons. This is a common method of controlling user behavior to ensure that important information is delivered in a secure way. The status bar The status bar is the area in the bottom border that displays information to the user (see Figure 5-9). 144
JavaScript in the Browser The Statusbar Figure 5-9 Normally, the status bar tells the user when the page is loading and when it has finished loading; however, it is possible to set its value using two properties of the window object: status and defaultStatus. As you may have guessed, status changes the status bar text for a moment while defaultStatus changes it as long as the user is on the page. For example, you may use a default status bar message when the page first loads: window.defaultStatus = “You are surfing www.wrox.com. “; You may also want to display information about a certain link when the user moves the mouse over it: Books This is especially useful when using a JavaScript URL because browsers, by default, display the value of the href attribute in the status bar when the user mouses over. Setting window.status can keep the details of the link implementation from users: 145
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Professional JavaScript for Web De
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Professional JavaScript for Web De
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Vice President and Executive Group
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Contents Acknowledgments Introducti
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Contents Scope 88 Public, protected
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Contents Simple Patterns 197 Metach
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Contents Chapter 10: Advanced DOM T
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Contents Chapter 14: Error Handling
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Contents Chapter 18: Interacting wi
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Introduction Although once supporte
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Introduction 2. ECMAScript Basics T
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Conventions Introduction To help yo
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What Is JavaScript? When JavaScript
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JavaScript Implementations What Is
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ECMAScript support in Web browsers
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What Is JavaScript? By creating a t
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The Browser Object Model (BOM) What
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Chapter 2 ❑ End-of-line semicolon
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Chapter 2 ❑ ❑ Pascal Notation
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Chapter 2 When a value is assigned
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Chapter 2 alert(typeof oTemp); aler
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Chapter 2 A few special values are
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Chapter 2 Converting to a string Th
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Chapter 2 The parseFloat() method w
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Chapter 2 This syntax is similar to
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Chapter 2 The toFixed() method retu
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Chapter 2 Next up is the concat() m
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Chapter 2 alert(oStringObject.subst
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Chapter 2 If you place this line of
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Chapter 2 The postfix increment and
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Chapter 2 1 0 0 1 0 (2 4 x1) + (2 3
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Chapter 2 var iResult = 25 & 3; ale
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Chapter 2 Note that left shift pres
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Chapter 2 In this example, a Boolea
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Chapter 2 Just like logical AND, if
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Chapter 2 Just like the multiplicat
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Chapter 2 var bResult = “23” <
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Chapter 2 operator to compare the s
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Chapter 2 if (i > 25) alert(“Grea
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Chapter 2 Labeled statements It is
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Chapter 2 The with statement The wi
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Chapter 2 For example: function say
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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
Page 122 and 123: Chapter 3 Car.prototype.color = “
Page 124 and 125: Chapter 3 } } Car.prototype.showCol
Page 126 and 127: Chapter 3 StringBuffer.prototype.ap
Page 128 and 129: Chapter 3 } } } return -1; This met
Page 130 and 131: Chapter 3 Summary ECMAScript provid
Page 132 and 133: Chapter 4 Shape Ellipse Polygon Cir
Page 134 and 135: Chapter 4 All new properties and me
Page 136 and 137: Chapter 4 The apply() method The ap
Page 138 and 139: Chapter 4 ClassB.prototype.name =
Page 140 and 141: Chapter 4 In ECMAScript, the class
Page 142 and 143: Chapter 4 } Rectangle.prototype = n
Page 144 and 145: Chapter 4 the limit in an effort to
Page 146 and 147: Chapter 4 Dynamic prototyping suppo
Page 148 and 149: Chapter 4 } } ClassZ.prototype.sayM
Page 150 and 151: Chapter 4 In this case, the supercl
Page 152 and 153: Chapter 4 Rectangle.prototype.getAr
Page 154 and 155: Chapter 5 Although originally creat
Page 156 and 157: Chapter 5 ❑ ❑ Code Maintenance
Page 158 and 159: Chapter 5 on the following line. Ne
Page 160 and 161: Chapter 5 alert("A is greater
Page 162 and 163: Chapter 5 Figure 5-2 The next tag i
Page 164 and 165: Chapter 5 The Browser Object Model
Page 166 and 167: Chapter 5 Frameset Example
Page 168 and 169: Chapter 5 ❑ resizeTo(w, h) — re
Page 170 and 171: Chapter 5 As mentioned previously,
Page 174 and 175: Chapter 5 Books Be careful not to o
Page 176 and 177: Chapter 5 Here, the code uses linke
Page 178 and 179: Chapter 5 you want to track where u
Page 180 and 181: Chapter 5 This code writes a tag t
Page 182 and 183: Chapter 5 The method assign() accom
Page 184 and 185: Chapter 5 Property/Method Descripti
Page 187 and 188: DOM Basics The Document Object Mode
Page 189 and 190: DOM Basics Today XML is one of the
Page 191 and 192: DOM Basics The Document Object Mode
Page 193 and 194: DOM Basics The node is considered
Page 195 and 196: DOM Basics The W3C has also publish
Page 197 and 198: DOM Basics Checking the node type Y
Page 199 and 200: Accessing specific nodes You alread
Page 201 and 202: DOM Basics To access the element w
Page 203 and 204: DOM Basics You’re not done quite
Page 205 and 206: DOM Basics This sample page replace
Page 207 and 208: DOM Basics To get and set the src a
Page 209 and 210: DOM Basics ❑ ❑ ❑ deleteCaptio
Page 211 and 212: DOM Basics Document Element html El
Page 213 and 214: DOM Basics var node3 = iterator.pre
Page 215 and 216: DOM Basics Hello World! List i
Page 217 and 218: DOM Basics var oOutput = document.g
Page 219: 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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Professional JavaScript For Web Developers

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