JavaScript Examples Bible - UserWorks Technologies

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Chapter 4 ✦ The Document and Body Objects (Chapter 18) The Results box shows that an object was created. Now, look at the properties of the object by typing a into the bottom text field. The precise listings of properties varies between IE5+ and NN6, but the W3C DOM properties that they share in common indicate that the object is a node type 3 with a node name of #text. No parents, children, or siblings exist yet because the object created here is not part of the document hierarchy tree until it is explicitly added to the document. To see how insertion works, enter the following statement into the top text field to append the text node to the myP paragraph: document.getElementById(“myP”).appendChild(a) The word “Hello” appears at the end of the simple paragraph lower on the page. Now you can modify the text of that node either via the reference from the point of view of the containing P element or via the global variable reference for the newly created node: document.getElementById(“myP”).lastChild.nodeValue = “Howdy” or a.nodeValue = “Howdy” elementFromPoint(x, y) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility ✓ ✓ ✓ Example Listing 18-14 is a document that contains many different types of elements, each of which has an ID attribute assigned to it. The onMouseOver event handler for the document object invokes a function that finds out which element the cursor is over when the event fires. Notice that the event coordinates are event.clientX and event.clientY, which use the same coordinate plane as the page for their point of reference. As you roll the mouse over every element, its ID appears on the page. In Figure 4-1, the pointer is inside a table cell, whose ID appears in bold at the end of the first paragraph. Some elements, such as BR and TR, occupy no space in the document, so you cannot get their IDs to appear. On a typical browser screen size, a positioned element rests atop one of the paragraph elements so that you can see how the elementFromPoint() method handles overlapping elements. If you scroll the page, the coordinates for the event and the page’s elements stay in sync. 247 document.elementFromPoint()
248 JavaScript Examples Bible: The Essential Companion to JavaScript Bible Figure 4-1: Revealing the object located at an event screen position Listing 18-14: Using the elementFromPoint() Method document.elementFromPoint() Method function showElemUnderneath() { var elem = document.elementFromPoint(event.clientX, event.clientY) document.all.mySpan.innerText = elem.id } document.onmouseover = showElemUnderneath document.elementFromPoint() Method Roll the mouse around the page. The coordinates of the mouse pointer are currently atop an elementwhose ID is:””.
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100% ONE HUNDRED PERCENT COMPREHENS
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“An excellent book that builds so
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JavaScript Examples Bible: The Ess
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About the Author Danny Goodman is t
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Preface Acommon thread running thro
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Preface Listing numbers are derived
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Acknowledgments Because most of the
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Contents Preface. . . . . . . . . .
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Contents Chapter 7: The Form and Re
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Contents Chapter 15: The NN4 Layer
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2 JavaScript Examples Bible: The Es
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192 FRAME.scrolling JavaScript Exam
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196 FRAMESET.cols JavaScript Exampl
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198 IFRAME.align JavaScript Example
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200 IFRAME.src JavaScript Examples
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192 FRAME.scrolling JavaScript Exam
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Page 333 and 334: 234 document.height JavaScript Exam
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Page 353 and 354: 254 document.write() JavaScript Exa
Page 364 and 365: Body Text Objects (Chapter 19) The
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Chapter 5 ✦ Body Text Objects (Ch
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inRange(otherRangeRef) Chapter 5
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TextRectangle Object Properties bot
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Image, Area, and Map Objects (Chapt
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Chapter 6 ✦ Image, Area, and Map
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dynsrc Chapter 6 ✦ Image, Area, a
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nameProp Chapter 6 ✦ Image, Area,
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start x y Chapter 6 ✦ Image, Area
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} Chapter 6 ✦ Image, Area, and Ma
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The Form and Related Objects (Chapt
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Chapter 7 ✦ The Form and Related
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length Chapter 7 ✦ The Form and R
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submit() Chapter 7 ✦ The Form and
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Button Objects (Chapter 24) The top
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Chapter 8 ✦ Button Objects (Chapt
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Checkbox Input Object Properties ch
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value Chapter 8 ✦ Button Objects
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Text-Related Form Objects (Chapter
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Chapter 9 ✦ Text-Related Form Obj
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document.forms[0].inspector.readOnl
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Chapter 9 ✦ Text-Related Form Obj
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} } Chapter 9 ✦ Text-Related Form
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onChange Chapter 9 ✦ Text-Related
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Select, Option, and Optgroup Object
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Chapter 10 ✦ Select, Option, and
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selectedIndex Chapter 10 ✦ Select
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Event handlers onChange Chapter 10
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Table and List Objects (Chapter 27)
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gColor Chapter 11 ✦ Table and Lis
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Now, adjust the cell spacing: docum
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NigerAtlantic Ocean26004180 Zamb
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Chapter 11 ✦ Table and List Objec
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type Chapter 11 ✦ Table and List
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Navigator and Other Environment Obj
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Chapter 12 ✦ Navigator and Other
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mimeTypes Chapter 12 ✦ Navigator
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screen Object Properties availLeft
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Event Objects (Chapter 29) As earli
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Chapter 13 ✦ Event Objects (Chapt
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Chapter 13 ✦ Event Objects (
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Figure 13-2: Clicking on one SPAN e
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clientX clientY layerX layerY pageX
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eventPhase Chapter 13 ✦ Event Obj
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440 ruleObject.style JavaScript Exa
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String and Number Objects (Chapters
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Parsing methods string.charAt(index
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488 array.concat() JavaScript Examp
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490 array.concat() JavaScript Examp
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492 array.reverse() JavaScript Exam
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494 array.sort() JavaScript Example
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What’s on the CD-ROM The accompan
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A above property, 442-443 accessKey
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set to empty, 11 working with, 12 c
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location property, 238-240 methods,
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frames border, 197-198, 199 control
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insertBefore() method compatibility
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go(), 221-222 hasChildNodes(), 74-7
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onSelectStart event handler compati
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frame, 385-387 FRAME element object
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protocol property, 213 document obj
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self property compatibility, 149 ex
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text property BODY element object,
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X x property IE4+ event object, 413
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4. Restrictions on Use of Individua
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CD-ROM Installation Instructions Th
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