31 CHAPTER Positioned Objects …. This is an oddball chapter within the scheme of Part III. Thus far, I have devoted each chapter to a distinct set of object model objects. This chapter breaks away from that mold for just a moment. The main reason that this chapter even exists has to do more with the history of Dynamic HTML the capability to alter content on the fly in response to user interaction particularly with respect to Netscape Navigator 4. The impetus for this separate discussion is the NN4 LAYER element and its associated object. What makes this discussion awkward is that the LAYER element and object became dead-end entities that never made it into the W3C standards process. NN6 instead has adopted the W3C standards for dynamic content, which more closely mimic the way Microsoft implemented its DHTML features starting with IE4. NN6 explicitly does not provide backward compatibility with scripted LAYER element objects, which also means that you must rewrite legacy applications to work in NN6. That leaves an ungainly task in this chapter to create a bridge between the LAYER element and the more modern way of working with elements that can be positioned on the page, flown across the page, stacked in front of other elements, or hidden from view. The IE4+ and NN6 way to accomplish all of this is through CSS style sheets and the scripting thereof. In years to come, the NN4 LAYER element will be only a distant memory. Until then, we must acknowledge it and understand how to work the same magic with style sheets. To that end, this chapter provides details on both the NN4 layer object and the comparable syntax for using IE4+ and NN6 style sheets to get and set properties or invoke methods. Chapter 48 applies these techniques in some DHTML applications. What Is a Layer? Terminology in the area of positioned elements has become a bit confusing over time. Because NN4 was the earliest browser to be released with positioned elements (the LAYER element), the term layer became synonymous with any positioned element. When IE4 came on the scene, it was In This Chapter Layer concepts How to move, hide, and show content The end of the LAYER element ….
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853Chapter 30 .Style Sheet and Style Objects Filter Name Description and Properties status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) Wave() Add sine-wave distortion Properties: add (1 or 0) freq (integer number of waves) light (strength 0 to 100) phase (percentage offset 0 to 100) strength (intensity 0 to 255) xRay() Render edges only Properties: None For more details on deploying filters in IE for Windows, visit http:// msdn.microsoft.com/workshop/author/filter/filters.asp. Because most of the live examples require IE5.5+/Windows, be sure to use that version for the best experience at that page. … elementRef.style.filterObject
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852 Part III . Document Objects Reference Table 30-3 (continued) Filter Name Description and Properties RandomDissolve() Pixelated dissolve transition Properties: duration (floating-point number of seconds) percent (0 to 100) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) RandomBars() Bar style transition Properties: duration (floating-point number of seconds) orientation (horizontal or vertical) percent (0 to 100) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) Shadow() Render as silhouette Properties: color (color value) direction (0, 45, 90, 135, 180, 225, 270, 315) Strips() Striped style transition Properties: duration (floating-point number of seconds) motion (in or out) percent (0 to 100) elementRef.style.filterObject
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851Chapter 30 .Style Sheet and Style Objects Filter Name Description and Properties addCone (sourceLeft, sourceTop, sourceZAxis, targetLeft, targetTop, red, green, blue, strength, spreadAngle) addPoint (sourceLeft, sourceTop, sourceZAxis, red, green, blue, strength) changeColor (lightID, red, green, blue, absoluteColor Flag) changeStrength (lightID, strength, absolute IntensityFlag) clear() moveLight (lightID, sourceLeft, sourceTop, sourceZAxis, absolute MovementFlag) MaskFilter() Overlay transparent mask Properties: color (color value) MotionBlur() Simulating blurred motion Properties: add (1 or 0) direction (0, 45, 90, 135, 180, 225, 270, 315) strength (pixel count) Continued elementRef.style.filterObject
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850 Part III . Document Objects Reference Table 30-3 (continued) Filter Name Description and Properties Fade() Blend transition Properties: duration (floating-point number of seconds) overlap (0.0 to 1.0 seconds) percent (0 to 100) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) Glow() Outer edge radiance Properties: color (color value) strength (intensity 1 to 255) Iris() Action transition with zoom effect Properties: duration (floating-point number of seconds) irisStyle (CIRCLE, CROSS, DIAMOND, PLUS, SQUARE, STAR) motion (in or out) percent (0 to 100) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition midstream) Light() Add light source (controlled by methods) Properties: None Methods: addAmbient(red,green,blue,strength) elementRef.style.filterObject
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849Chapter 30 .Style Sheet and Style Objects Filter Name Description and Properties Blinds() Action transition with Venetian blind effect Properties: direction (up, down, right, left) squaresX (integer column count) squaresY (integer row count) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) Checkerboard() Action transition with checkerboard effect Properties: bands (1 to 100) direction (up, down, right, left) duration (floating-point number of seconds) percent (0 to 100) slideStyle (HIDE, PUSH, SWAP) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) Chroma() Color transparency Properties: color (color value) DropShadow() Shadow effect Properties: color (color value) offx (horizontal offset pixels) offy (vertical offset pixels) positive (1 or 0) Continued elementRef.style.filterObject
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848 Part III . Document Objects Reference Table 30-3 IE5.5 DXImageTransform.Microsoft Filter Names Filter Name Description and Properties Alpha() Transparency level Properties: opacity (0 to 100) finishopacity (0 to 100) style (gradient shape 0 to 3) startX (coordinate integer) startY (coordinate integer) finishX (coordinate integer) finishY (coordinate integer) Barn() Barn-door style transition Properties: duration (floating-point number of seconds) motion (in or out) orientation (horizontal or vertical) percent (0 to 100) status 0 (stopped), 1 (applied), 2 (playing) Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) BasicImage() Element rotation, flip, color effects, and opacity Properties: grayScale (1 or 0) invert (1 or 0) mask (1 or 0) maskColor (color value) mirror (1 or 0) opacity (0.0 to 1.0) rotation 0 (no rotation), 1 (90 ), 2 (180 ), 3 (270 ) xRay (1 or 0) elementRef.style.filterObject
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847Chapter 30 .Style Sheet and Style Objects Strips left up Strips right down Strips right up Random bars horizontally Random bars vertically Random effect

Click on the image to cause a reveal transition.

IE5.5 filter syntax changes While IE5.5/Windows still supports the original IE4 way of controlling filters, the browser also implements a new filter component, which Microsoft strongly encourages authors to use (as evidenced by the difficulty in finding documentation for the IE4 syntax at its developer Web site). In the process of implementing this new filter component, the names of many filters change, as do their individual properties. Moreover, the way the filter component is invoked in the style sheet is also quite different from the original component. The style sheet syntax requires a reference to the new component as well as the filter name. Here is the old way: #glower {filter:glow(color=yellow, strength=5, enabled=true)} And here is the new way: #glower {filter:progid:DXImageTransform.Microsoft.Glow(color=yellow, strength=5, enabled=true)} Don t overlook the extra progid:pointer in the reference. This program identifier becomes part of the filter name that your scripts use to reference the filter: document.all.glower.style.filters[ DXImageTransform.Microsoft.Glow ].color = green While some of the filter names and properties stay the same (except for the huge prefix), several older properties are subsumed by new filters whose properties help identify the specific effect. The former revealTrans() filter is now divided among several new filters dedicated to transition effects. Table 30-3 shows the IE5.5 syntax. Note Using the new syntax in IE5.5 can cause frequent crashes of the browser (at least early released versions), especially transition filters. If you implement the new syntax, be sure to torture-test your pages extensively. elementRef.style.filterObject
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846 Part III . Document Objects Reference Building on the example in Listing 30-1, the next example in Listing 30-2 demonstrates how a script can also modify a filter object s property, including a transition filter. Before the transition filter has its apply() method invoked, the script sets the transition type based on a user choice in a SELECT list. Listing 30-2: Choosing Reveal Transitions Between Images

IE4+ Transition and Choices

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Choose the desired transition type: Box in Box out Circle in Circle out Wipe up Wipe down Wipe right Wipe left Vertical blinds Horizontal blinds Checkerboard across Checkerboard down Random dissolve Split vertical in Split vertical out Split horizontal in Split horizontal out Strips left down elementRef.style.filterObject
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Web site design and hosting - 845Chapter 30 .Style Sheet and Style Objects Filter

Sunday, January 27th, 2008

845Chapter 30 .Style Sheet and Style Objects Filter Name Description and Properties 23Random effect Methods: apply() (freezes current display) play() (plays the transition) stop() (stops transition mid-stream) To make a transition work under script control, a filter must be applied to the element that you want the transition to work on. That can be done by script or by assigning a filter style to the element. As for the scripting, you begin by invoking the apply() method of the desired filterobject. Next, script the change, such as assigning a new URL to the srcproperty of an IMG element. While you do this, the apply() method freezes the image until you invoke the play() method on the filter. Listing 30-1 effects a checkerboard transition between two images after you click the image. Listing 30-1: A Reveal Transition Between Images

IE4+ Transition

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Click on the image to cause a reveal transition.

elementRef.style.filterObject
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