JavaScript 2.0-The Complete Reference, Second ... - freecodingtutorial

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Now that we have seen all the components of the traditional object model, it is time to show how all the components are used together. As we have seen previously, by using a tag‘s name or determining its position, it is fairly easy to reference an occurrence of an HTML element that is exposed in the JavaScript object model. For example, given we would use document.myForm.userName to access the field named userName in this form. But how do you manipulate that tag‘s properties? The key to understanding JavaScript‘s object model is that generally (X)HTML elements‘ attributes are exposed as JavaScript object properties. So given that a text field in XHTML has the basic syntax of then given our last example, document.myForm.userName.type references the input field‘s type attribute value, in this case, text, while document.myForm.userName.size references its displayed screen size in characters, document.myForm.userName.value represents the value typed in, and so on. The following simple example puts everything together and shows how the contents of a form field are accessed and displayed dynamically in an alert window by referencing the fields by name. Meet and Greet
{ } var theirname=document.myForm.userName.value; if (theirname !="") alert("Hello "+theirname+"!"); else alert("Don't be shy."); //-->> What's your name? Not only can we read the contents of page elements, particularly form fields, but we can update their contents using JavaScript. Using form fields that are the most obvious candidates for this, we modify the previous example to write our response to the user in another form field.
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JavaScript 2.0-The Complete Referen
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JavaScript 2.0-The Complete Referen
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Serrato, Darlene Hernandez, Michele
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First JavaScript document.write("
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In this case, the tag happens to s
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Ready start alert("First Script
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Script Hiding Most browsers tend to
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alert("Your JavaScript is on!
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Event Trigger Example A re
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Notice that the src attribu
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Figure 1-6: JavaScript console used
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Table 1-1: Browser Versions and Jav
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A scripting language is a language
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This is not a problem in itself. Th
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y a linebreak without causing an er
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Being weakly typed is both a blessi
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myArray[1] = 5; myArray[2] = "Thoma
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To compare objects, JavaScript prov
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} else { } x = x + 1; First, the co
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do { document.write(x); document.wr
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This code declares a function named
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document.write("This text is no
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*/ invoke it as follows: var y = sq
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Part II: Core Language Chapter 3: D
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throughout both the chapter and the
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The other important special value i
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Things get really messy if you work
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Close examination of the table of e
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document.write("Note how newlines (
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Note Some Netscape browsers do not
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Methods of objects are accessed in
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The typeof Operator If you‘re cur
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Number "NaN", "0", or the string re
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A variable‘s name should give som
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execute. This context contains the
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} function innerFunction() { } aler
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context, the interpreter would firs
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y = y - 1 is fine. But if you make
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Operators JavaScript supports a var
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There is one further wrinkle with t
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Table 4-3 shows the bitwise operato
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Table 4-5: Shorthand Assignment wit
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Comparison Operators A comparison e
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"thomas" >> "fritz" "aaaa" >> "a" "
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var a,b,c,d; a = (b=5, c=7, d=56);
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alert(myArray[2]); alert(myArray[3]
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Table 4-9: Precedence and Associati
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JavaScript supports a core set of s
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else if (expression2) statement or
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Figure 4-1: Logical expressions can
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else if (yourGrade == 'D') alert("N
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} case 'C': alert("You passed!"); c
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{ } // do something Last, an import
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document.write("Start the countdown
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} document.write("Outerloop: "+i+""
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The with statement indicates an obj
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alter program flow. A variety of lo
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Functions do not have to receive on
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Functions always return some form o
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document.write("In function fiddle
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} x = 7; document.write("x="+x+"");
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However, more likely, we purposeful
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document.write("Entering testFuncti
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"statements for function body"); As
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A similar kind of nameless function
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The result shown next demonstrates
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Note that this isn‘t a terribly r
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Using Functions Before concluding t
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} if (addTwo.arguments.length == 2)
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familiar to anyone who has programm
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creates String objects while the Ar
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The result is As you can see, the s
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Figure 6-1: Enumerating properties
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statement; Using with lets you refe
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Declare a function taking two argum
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Table 6-2: Properties and Methods C
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Notice that we named the method att
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If the way the robot object has bee
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Object-Oriented JavaScript Before j
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} this.hasJetpack = true; This exam
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function Robot(flying, action) { }
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var feature = guard.feature; var ca
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var firstArray = []; var secondArra
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The effect is as if no element had
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var myValues = new Array(); myValue
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stack.pop(); // ["first", 10] Retur
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Unlike with the push() and shift()
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It takes a variable number of argum
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If you want to be more succinct, yo
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} { } var last = this[this.length-1
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Table 7-1: Arguments to the Date()
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document.write("The current date :
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If you are not sure whether the par
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Page 193 and 194: var s = new String(); var headline
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Page 197 and 198: Table 7-6: HTML-Releated String Met
Page 199 and 200: This chapter is an introduction to
Page 201 and 202: expressions are designed to be very
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Page 205 and 206: Table 8-2: Regular Expression Escap
Page 207 and 208: var pattern = /ab+c/; is read as
Page 209 and 210: var pattern = /[0-9]+/; This regula
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Page 213 and 214: You could use the following regular
Page 215 and 216: document.writeln("result.lastIndex
Page 217 and 218: } // if we have a match, print info
Page 219 and 220: Table 8-7: Static Properties of the
Page 221 and 222: var stringwithdelimits = "10 / 3 /
Page 223 and 224: Non-capturing Parentheses JavaScrip
Page 225 and 226: addresses instead of domain names (
Page 227 and 228: 1. The core JavaScript language (e.
Page 229 and 230: For the sake of brevity, some detai
Page 231 and 232: ""); document.write("Page Colors");
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Page 235 and 236: Figure 9-4: Some Document propertie
Page 237 and 238: using the traditional JavaScript
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Page 243 and 244: Greeting: The previous examp
Page 245 and 246: Table 9-4: New Document Properties
Page 247 and 248: Netscape 4 Layer Example An example
Page 249 and 250: Figure 9-8: Internet Explorer 4 obj
Page 251 and 252: finds tag with id or name = myHeadi
Page 253 and 254: Table 9-7: Some New Properties for
Page 255 and 256: onclick="document.all['heading1'].s
Page 257 and 258: style, and content) to a programmin
Page 259 and 260: var feature; var version; for (i=0;
Page 261 and 262: The most important thing to think a
Page 263 and 264: Before moving on, we need to introd
Page 265 and 266: Table 10-2: DOM Node Properties DOM
Page 267 and 268: currentElement = currentElement.fir
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Page 271 and 272: } } else alert("No parent"); break;
Page 273 and 274: onclick="currentElement=document.do
Page 275 and 276: Collection Description >document.an
Page 277 and 278: the necessary references. Let‘s s
Page 279 and 280: } if (node.parentNode) { } //-->> i
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Page 283 and 284: } function doReplace() { } var repl
Page 285 and 286: Table 10-5: Text Node Manipulation
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-->> Simple DOM HTML Editor &n
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It would be easy enough to mod
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Table 10-6: CSS Property-to-DOM Pro
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"http://www.w3.org/TR/xhtml1/DTD/xh
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Style: normal italic oblique Wei
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onchange="theElement.style.fontSize
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Height: Width: &nbs
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theElement = document.getElementByI
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This is a paragraph This is a parag
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override them with local rules. Und
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} if (styleSheet.cssRules[0]) { } s
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There are a few things to study car
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var myWalker = document.createTreeW
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While the Traversal API is not wide
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adding content to the document. Bec
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inner/outer Tester This is a t
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>
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Figure 10-6: Using document.all[] a
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some consistency to the mad world t
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Table 11-2: Basic Events and Their
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ondblclick: onfocus: onkeydown:
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Browsers might support events othe
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onbeforedeactivate Fires just befor
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oncut Fires when selected content i
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ondrop Fires on a valid drop target
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onpropertychange Fires whenever a p
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page Non-standard Event Binding in
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this is to assign handlers after th
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Table 11-4: Effect of Returning fal
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One major difference between versio
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if you check your JavaScript consol
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To set up event capturing, use the
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keep tabs on what happened to an ev
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We may be in the gutter, but some o
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Table 11-9: Behavior of Internet Ex
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Table 11-9: Behavior of Internet Ex
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Preventing Bubbling You can stop ev
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The DOM2 Event model specification
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document.getElementById('myText').r
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Alt Key down? Control Key down? M
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The result of a click is shown in
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when the user activates the pull-do
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function killClicks(event) { } even
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-->> The killClick handler is regi
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startListen(); //-->> Current Nod
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Table 11-18 summarizes the major fe
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Part IV: Using JavaScript Chapter 1
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window.confirm(string); or simply c
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value that contains the value enter
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Opening and Closing Generic Windows
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in some browsers, while others may
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Table 12-1: Feature Parameter Value
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featurestring += "width="+document.
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Left: (IE) ScreenX: ScreenY: (Ne
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Figure 12-1: Simple window and its
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} } //-->> else customAlert("Bor
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} } myWindow.focus(); // Make the w
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windowHTML += ""; windowHTML += "An
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windowname is the name of the windo
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function moveIt() { if ((window.myW
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myWindow.moveBy(0,10);" />> X: Y:
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It is also possible to access parse
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5,4,3,2,1...BOOM Browser Self-De
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message = message.substring(1, mess
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Event Description onafterprint Even
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parent.frames[0].name would print o
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" var i = 0; msg += "Window: "+ win
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Two Frames within the naviga
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While inline frames seem to be a si
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window.onload = frameBuster; // -->
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Variables
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Back to previous page While Ja
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Interested readers are enc
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Table 13-1: Document Properties Rel
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Unvisited Link Click to show active
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Location and Related Properties The
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str += "but remember the rules of X
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You also can read the target proper
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onclick="document.myform.field1.val
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} str += "border: "+theImage.border
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(document.all[10]) or by name (docu
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Table 13-4: Common DOM Properties f
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All other (
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Table 13-7: (X)HTML Elements Associ
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Table 13-7: (X)HTML Elements Associ
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} } var newText = document.createTe
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(X)HTML Table Inspector Test T
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Jet Packs Economy JP-3455E6
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above below border box hsides vside
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for (i = 0; i > document.writeln("R
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onclick="theTable.insertRow(documen
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} var colNumber = parseFloat(column
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} var numberRowsInTable = theTable.
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onclick="doCellModification(documen
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object. As with all document object
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Just as the Document contains a col
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} document.write("length: "+length+
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property. In short, it is most usef
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Remember that these buttons (i
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Table 14-5: Properties of the HTMLB
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Closely related to inputs of type "
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Common Field Properties
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Of course, the preceding script
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Checkboxes and radio buttons (―ra
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Yes: No: Maybe: does not, as it
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yes: no: maybe: onclick="a
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-->> Hidden Fields Hidden form f
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Trainer Friend Cook An HTMLSelectEl
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} //-->> alert(msg); Option 1 Op
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cities["Australia"] = ["Sydney", "M
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Brisbane The previous example il
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eserved keyword. We‘ll see anothe
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} for (i = 0; i
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Abstracting Form Validation The pr
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} if (/[^@]+@[^@]+/.test(s)) return
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if (!isInteger(s)) return false; va
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} { } alert("Email may not be empty
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} } { } case 'notblank': if (isEmpt
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Form Validation via Hidden Fields A
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} // Check for special characters l
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A final observation that escapes ma
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JavaScript can be used to turn disa
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Figure 14-4: Rendering of dynamic f
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} } return true; else { } window.st
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Widgets: @ 1.50 each Gadgets: @
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calculated fields. Also note that,
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Figure 15-1: Manipulating Image pro
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Complete: Height: Hspace: Nam
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} } } alt.value = i.alt; border.val
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{ } var i = new Image(); i.src = ur
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The complete working example is sho
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...Page content here... Give
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{ } var abouton = new Image(); abou
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Figure 15-2
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With CSS, you can go even furthe
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Absolutely positioned elements not
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color of the region to orange as se
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} } return(getElement(layerName, la
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} /* set the width of layer named l
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* return the object for the passed
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* set the x-coordinate of layer nam
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} else if (opera) else theLayer.sty
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} { } theLayer.document.write(conte
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z: Height: Width: />>
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Figure 15-3: Testing our cross-brow
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object, enabling control of the con
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} ("") : ("lightblue")); // IE can'
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DOM Level 2 style of event listener
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#mirror {border-style: solid; borde
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Notice how, in the preceding examp
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What's my style? Take 2 p { text-
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Figure 15-6: A simple DHTML page tr
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} if (clipleft A point of intere
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obots!');" 'If you like our domes,
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{ } currentX = getX('ufo'); if (cur
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} if (layerobject) else return(pars
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} /* move left until boundary */ fu
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We could modify the animation
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should not be placed within a form
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Select Navigation
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E-commerce ------------------------
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JavaScriptRef
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Yahoo Teoma MSN DMOZ E-commerce S
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JavaScript libraries on the Web suc
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} } { alert("Main window went away.
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Although the following code is writ
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{ // else move it 5 more pixels in
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Figure 16-5: The slide-in menu in a
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else if (document.all) // else if i
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Bottom of the page As with all
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application of this technology is t
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When you assign a new cookie value
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array else { // extract its value }
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a user with the cookie ―username=
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If the user doesn‘t have cookies
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} } } value = document.cookie.subst
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Where a calculator on the ENIAC is
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Enter some text to store: When
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Table 17-1: Navigator Properties fo
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Notice already from Figure 17-1 th
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document.write("Browser Not Known:
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Error: No JavaScript Support E
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// JS 1.5 features var version="1.
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else alert("You have Flash!"); aler
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A rendering of the example is show
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* nasty hack to deal with doctype s
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Under browsers like Internet Explor
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Figure 17-2: Explorer’s client ca
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Given that some buttons can b
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Given the danger involved in settin
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Part V: Advanced Topics Chapter Lis
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Your browser does not support Java!
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} public void paint(Graphics myScre
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Your browser does not support Java!
Page 707 and 708:
Plug-ins are persistent in the brow
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{ for (var i=0; i
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{ for (var i=0; i
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Suppose you have written some custo
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} function changeFrame(i) { } if (!
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Page 719 and 720:
Whereas Java applets are downloaded
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Browsers that do not understand wi
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function play() { } if (!dataReady)
Page 725 and 726:
> // you can write an image in he
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This chapter served as an introduct
Page 729 and 730:
} var img = new Image(); img.src =
Page 731 and 732:
The HTTP response code 204 ―No Co
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{ } // If we've already got a reque
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User: Deagol (check online status)
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One fundamental vehicle enabling se
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{ var params = "numstories=" Note O
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RPC Spellchecker
Page 743 and 744:
+ } if (rpcResult === true) else al
Page 745 and 746:
} var newScript = document.createEl
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Iframe RPC The Server Respon
Page 749 and 750:
echo ""; ?>> In order to see this i
Page 751 and 752:
The following example illustrates t
Page 753 and 754:
The capability to update a page wit
Page 755 and 756:
Figure 20-1: Well-formed XML under
Page 757 and 758:
in which a document‘s logical str
Page 759 and 760:
&cola; We could easily have just
Page 761 and 762:
XSL Test Note In order to
Page 763 and 764:
Whereas the preceding example is ra
Page 765 and 766:
(123) 456-2222 fli@democompany.com
Page 767 and 768:
You can reference the style
Page 769 and 770:
directory {display: block;} employe
Page 771 and 772:
MathML Below x + y 2 k +
Page 773 and 774:
...HTML content... or you can refe
Page 775 and 776:
Once you bind data into a document,
Page 777 and 778:
We could further use the DOM proper
Page 779 and 780:
{ var rootElement = xmldoc.document
Page 781 and 782:
if (type == 1) { // open tag dump("
Page 783 and 784:
-->> XML Document: Name: Title
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xmldoc.async = false; xmldoc.load("
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Name: Title: Phone: Email:
Page 789 and 790:
Sales Executive (543) 555-5672 jone
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*/ var title = document.getElementB
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* append completed record to the do
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} //-->> /* append completed record
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A fake entry http://www.javascriptr
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a:hover {color:#FF9900;} #feedOutpu
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var itemURL = itemList[i].getElemen
Page 805 and 806:
If you inspect the preceding exam
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Table 21-2: Relationship Between Mi
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Table 21-4: Proprietary Extensions
Page 811 and 812:
of access to select one of the memb
Page 813 and 814:
The result is shown in Figure 21-1.
Page 815 and 816:
You must also indicate the comments
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Table 21-7: Some Proprietary Featur
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encountered. The browser generally
Page 821 and 822:
Two problematic questions are how t
Page 823 and 824:
HTML Applications HTML Applications
Page 825 and 826:
} var fso, filehandle; //-->> fso =
Page 827 and 828:
E, Elephant F, Fox G, Girl H, Hat T
Page 829 and 830:
Figure 21-3: Data Binding example u
Page 831 and 832:
Figure 21-5: Using dynamic properti
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arbitrary elements in a page. HTCs
Page 835:
var originalColor; function activat
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Table 21-12: Some Default Behaviors
Page 840 and 841:
Figure 21-6: Pop-up windows give yo
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There are numerous JScript capabili
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Note Interested readers can learn m
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Table 21-17: Components of Mozilla
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comes from a trusted source. Such c
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even if the page in that window was
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of incorporation, domain name owner
Page 854 and 855:
Figure 22-2: Categorizing sites int
Page 856 and 857:
The column of Table 22-3 indicating
Page 858 and 859:
function doitagain() { } document.w
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escape(document.cookie); This scri
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Although some defensive programming
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Figure 23-1: Enabling notification
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Table 23-2: Common JavaScript Error
Page 868 and 869:
if (debugging) alert("Returned from
Page 870 and 871:
Figure 23-4: Using Error.stack to g
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} document.writeln(x); document.wri
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Figure 23-7: Enabling script debugg
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you can replace or suppress the err
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if (window.opener && !window.opener
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} return true; window.onerror = rep
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You can also create instances of th
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if (typeof(a) != "number" || typeof
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The appearance of a browser to supp
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efresher. We now turn our attention
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teksasliunescape(teks);document.wri
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Standard Version Description ECMASc
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Table A-7: Primitive JavaScript Dat
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Table A-11: Result of Type Conversi
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Object Description Array Provides a
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new Function(["arg1", ["arg2"], …
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Table A-21: Binary and Self-assignm
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A JavaScript implementation should
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} where statements is composed of z
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switch (expression) { } case val1:
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document.write(i+""); i++; } while
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Table A-27: Some Regular Expression
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Table A-32: Advanced Regular Expres
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Figure B-2: The traditional object
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Figure B-6: The Internet Explorer 4
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className String holding value of t
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eadyState Read-only string containi
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fireEvent(handler [, event]) Causes
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setExpression(property, expression
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Supported in IE4+, MOZ/N6+, DOM1. N
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This object has the following prope
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In Netscape 4.0-4.05 (JavaScript 1.
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ig, HTMLElement (Document Object) T
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constructor Reference to the constr
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caption, HTMLTableCaptionElement (D
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clipboardData (Proprietary Browser
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"move", "copyLink", "copyMove", "li
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setDate(dayOfMonth) Sets the day of
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Supported in Internet Explorer 4+,
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Document (Document Object) The Docu
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styleSheets[] Collection of styleSh
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Methods This object has only the me
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The message string defines the text
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properties ALT_MASK, CONTROL_MASK,
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setCapture([containerCapture]) Caus
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onblur Fires when an element loses
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Netscape Extended Events The follow
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onresizeend Fires when the user fin
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This object has the following metho
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Support Supported in Internet Explo
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Constructor This object cannot be i
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Individual entries in the history a
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scrolling String specifying whether
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"hidden", "image", and "button". Tr
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Despite being a tag found within a
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This object has the following prope
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Generally speaking, reserved words
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Index Symbols -- (decrement) operat
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ActiveXObject, 655-657, 772 addEven
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properties, 775 removing elements,
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ody object, HTMLBodyElement, 780-78
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dataTransfer, 788-789 external, 817
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passing composite types, 115-116 pa
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speed of writing, 724 value of comm
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overview of, 522 parsing, 525-526 r
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undefined, 58-60 dataTransfer objec
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ollovers, 498-499 sparing use of DH
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document objects, 761-769 abbr, 771
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optGroup, 851 option, 851-852 overv
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document tree navigation, browser d
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dynamic typing, 29-31, 155 Index_E
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special characters, 54-55 strings,
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defined, 297 overview of, 298 Event
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advantages/disadvantages, 16 functi
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properties, 417-419 form validation
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passing primitive types by value, 1
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HTML applications (HTA), 657-660, 6
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Radio, 856-857 Reset, 859-860 submi
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events, 814-817 hiding proprietary
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one-way communication with servers,
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Java applets accessing in JavaScrip
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keyboard masking, 453-454 keywords
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syntax, 737-738 variable declaratio
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methods common to all objects, 145-
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owser supporting, 134 javaEnabled(
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null data type conversion of, 734 d
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objects, 133-158 as associative arr
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comparison. see comparison operator
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IE security zones, 686-690 Mozilla,
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prototypes, extending Array objects
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string methods, 211-214 syntax, 748
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RPCs (remote procedure calls) callb
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ActiveXObject, 655-656 browser issu
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square brackets ([ ]), 93, 198 src
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functions made accessible by, 135 m
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logical operators, 740 loops, 746-7
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methods common to all objects, 145-
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Index_V V valid XML, 607-608 value,
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document property, 134 DOM methods
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eference book, 6 referencing elemen
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List of Figures Chapter 1: Introduc
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Figure 11-1: A click on the bold te
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Figure 20-7: XHTML with MathML and
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List of Tables Chapter 1: Introduct
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Table 10-3: DOM Level 0 Collections
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Table 15-2: Position-Related Proper
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Table A-13: Result of Type Conversi
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