JavaScript Examples Bible - UserWorks Technologies

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Image, Area, and Map Objects (Chapter 22) The IMG element object is a popular scripting target, largely because it is easy to script it for effects such as mouse rollovers. Moreover, the element’s scriptability extends backward in time to all but the very first generation of scriptable browsers. Playing a supporting role in image rollovers is the abstract Image object, which scripts use to pre-load images into the browser’s cache for instantaneous image swapping. Even though the two objects manifest themselves differently within script operations, they share properties and methods, making it easy to learn their capabilities side by side. AREA and MAP element objects work closely with each other. In practice, an AREA element resembles an A element that is set to work as a link. Both elements create clickable “hot spots” on the page that typically lead the user to other locations within the site or elsewhere on the Web. They also share a number of URL-related properties. Examples Highlights ✦ Most IE browsers can load both still and motion images (such as MPEG movies) into an IMG element. Listing 22-3 shows how to swap between still and motion images via the dynsrc property. ✦ The page created from Listing 22-4 lets you compare the performance of swapping images with and without precaching. You also see how to have scripts rotate images on a timed schedule. ✦ Watch how the IMG element’s onLoad event handler can trigger actions in Listing 22-5. ✦ A powerful Listing 22-7 demonstrates how scripts can fashion new client-side area maps when a different picture file loads into an IMG element. 6 C H A P T E R ✦ ✦ ✦ ✦ In This Chapter How to precache and swap images Invoking action immediately after an image loads Creating interactive, client-side image maps ✦ ✦ ✦ ✦
318 IMG.align JavaScript Examples Bible: The Essential Companion to JavaScript Bible Image and IMG Element Objects Properties align NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility ✓ ✓ ✓ ✓ Example Listing 22-1 enables you to choose from the different align property values as they influence the layout of an image whose HTML is embedded inline with some other text. Resize the window to see different perspectives on word-wrapping on a page and their effects on the alignment choices. Not all browsers provide distinctive alignments for each choice, so experiment in multiple supported browsers. Listing 22-1: Testing an Image’s align Property IMG align Property function setAlignment(sel) { document.myIMG.align = sel.options[sel.selectedIndex].text } IMG align Property Choose the image alignment: absbottom absmiddle baseline bottom left middle right texttop top
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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 15: The NN4 Layer
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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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234 document.height JavaScript Exam
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254 document.write() JavaScript Exa
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Body Text Objects (Chapter 19) The
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Page 376 and 377: commonAncestorContainer Chapter 5
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Page 418 and 419: Chapter 6 ✦ Image, Area, and Map
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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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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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String and Number Objects (Chapters
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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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onDragStart event handler, 103, 108
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insertBefore() method compatibility
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go(), 221-222 hasChildNodes(), 74-7
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NN4 layer object above property, 44
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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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4. Restrictions on Use of Individua
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CD-ROM Installation Instructions Th
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