To be able to create animated visual transitions between Web pages. To be able to modify filters dynamically, using DHTML. Prentice Hall, Inc. All rights. DHTML Filter Session There are two types of filters: visual filter and transitions. A visual filter affects the appearance of the content. greater variety of special effects. To be able to create animated visual transitions between Web pages. To be able to modify filters dynamically, using DHTML.

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Positive integers move the drop shadow to the right, negative integers move the drop shadow to the left. The following example uses transitions to display information in an interesting manner fhtml the page loads. One example is changing the src attribute of an image to display a new image on-screen.

For more information, see Archived Content.

Filters and Transitions

The most important is because they don’t require script. Filters are a convenient package for the same functionality that scripting provides. The default value is left. When you change the content of the filtered object, content outside the final boundary of the object is not captured by the transition’s effects. The filter property is a string of filter descriptions that filter a function-like notation, but you do not need to know script to implement this property.

For instance, using the div object defined above, the following code produces an alert message.

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X-Ray effect grayscales ddhtml flattens the color depth. Additional changes to that collection’s filter string modify the new string. Motion Blur is used to create blurred pictures or text with the direction and strength.

Invert Maps the colors of the object to their opposite value in the color spectrum. The collection can be accessed like any other object model collection.

For complex filter manipulation, you must keep track of the current states of the filter collections. The second transitikns flips the image vertically. Almost any object can have filters applied to it.

CSS Filters Text and Image Effects

Remember that image downloading is asynchronous, and the visual state of objects isn’t fully updated until after images are completely downloaded.

When the filter will be displayed, the script can set the Enabled property of that filter to true. Opacity is expressed as a percentage. As interactive objects, links can change state in response to mouse events, as this example demonstrates.

Filters and Transitions

This example HTML attaches two filters to the object. Even though the Compositor filter provides a static filter output, it is implemented as a transition, and should follow other static filters in an object’s declaration. For example, the following HTML causes the image to be 20 percent opaque. Alternately, you can access the CheckerBoard filter by index.

GIF images must be in gif89a format with a transparent color to display these filters properly. For example, if you apply a Glow filter to an object’s text without a margin, the object boundary clips some of the glow effect if the text is next to the boundary.


You can control the same Light filter with more sophisticated programming, as the following example shows.

This raises the question, “Why use filters if script can do the job? You can use transitions in both static and dynamic Web pages. Nonevent transitions are analogous to an filters—they are used frequently to enhance the appearance of a page without changing its interactivity. The following example shows how to perform an automatic slide show of images.

Four events can create instances of interpage transitions: These filters may not work in your browser. Mask effect is used to turn transparent pixels to a specified color and makes opaque pixels transparent. You can use the onfilterchange event to coordinate moving or resizing the content. If you change the position of the object, the play method moves the initial content to the new position, and then makes a transition to the new transitlons.

Another benefit of filters is that they are easier to author and can be applied to entire classes of teansitions, because they use the declarative and inherited syntax of CSS.

In the following example, the opacity of the content of an object is dynamically changed by changing the opacity property of the Alpha filter.