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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Preloading graphics for separate objects is a good way to avoid the synchronicity issue, but it only works if the transition is applied after all images are downloaded. This example also demonstrates the difference between asynchronous and synchronous changes.

If you are developing your site for multiple browsers, then it may not be a good idea to use CSS filters because there is a possibility that it would not give any advantage.

If true, the image is added to the blurred image; and if false, the image is not fjlters to the blurred image. The following example shows how to perform an automatic slide show of images. With filters, multiple graphics are no longer required—you can change the display of one graphic to indicate whether it is available for user interaction.

You can use the onfilterchange event to coordinate moving or resizing the content. The BODY element automatically has layout because it specifically contains filtfrs client area of the window. Some objects, like form controls, filers layout by default.

The default is 5 pixels. Opacity is expressed as a percentage.

Dynamic HTML: Filters and Transitions

Filters and transitions enable you to create many compelling user interface applications, as shown in the following example. Even though the Compositor filter provides a transtions filter output, it is implemented as a transition, and should follow other static filters in an object’s declaration. The Alpha filter is a good example of a visual filter. Dynamic visual effects bring a basic level of interactivity to Web documents.

The direction of the blur, going clockwise, rounded to degree increments. Visual filters are extensions to CSS properties that change the display of an object’s contents. Filters are a convenient package for the same functionality that scripting provides. It is also possible to apply transitions while events are fired on the page. Even when dynamically adding filters, in most cases you should add the filter to the initial filter declaration in the object’s style sheet with the Enabled property set to false.


These filters may not work in your browser. The filter property is a string of filter descriptions that uses a function-like notation, but you do not need to know script to implement this property. If false, all transparent pixels have a dropshadow. Changing the src property is effectively asynchronous. The BasicImage and MotionBlur filters are both applied to the object.

I effects are an easy way to enhance a Web page’s design with minimum effort, and often without scripting.

Filters and Transitions

Visual effects can be animated using a timer script. This example HTML attaches two filters to the object. The following example addresses transiyions filters by their numeric and named indexes in the filters collection. Additional changes to that collection’s filter string modify the new string.

However, the object that the filter is applied to must have layout before the filter effect will display. Put simply, having layout means that an object has a defined height and width.

By adding an onfilterchange event handler to capture the completion of one transition, you can trasitions transitions together so they start one after another.

To see the Filters and Transitions Interactive Demo, which demonstrates most of the filters and transitions, click the following button. When a transition is applied to a page, it creates an interpage transition where the page’s entire content becomes the object of the filter.

Filters and Transitions

If it is a transparent image, then glow is created around the opaque pixels of it. Invert Maps the colors of the object to their opposite value in the color spectrum. The event object supplies the necessary information about the filter and the object involved. Also, if the shape of the new content is changed, the play method clips the initial content to the new size and then makes a transition to the new content. For example, changing the Alpha filter’s opacity property in a short looping script does not result in consecutive updates to the object.


The following example shows how you can combine the MaskFilter filter with a series of style changes. Wave effect is used to give the object a sine wave distortion to make it look wavy.

The following example shows how to work around applying a filter to the BODY element. Flip effect is used to create a mirror image of the object. This raises the question, “Why use filters if script can do the job? Chroma Filter is used to make any particular color transparent fjlters usually it is used with images. By continuing to browse this site, you agree to this use.

Drop Shadow is used to create a shadow of your object at the specified X horizontal and Y vertical offset and color.

CSS Filters Text and Image Effects

To avoid these results, use the Percent property to capture a frame of the transition and incrementally move or resize the content. In other cases, a filter goes far beyond script and modifies the rendered appearance of the content of an object. Filters and transitions display properly only on systems that have the color palette set to display colors or more. Just as programs such as Microsoft PowerPoint enable transitions between slides, you can provide wipes and fades, and create custom transitions when the content on a Web page changes.

In the example, using BasicImage’s Mirror and Rotation properties gives the appearance of flipping the image vertically. This article includes the following sections, which explain how to use filters and transitions to add visual effects to your Web page.

Dynamic effects require an event to prompt a change in the document—this can be an onmouseover or click event, a timer interval, or a xhtml of script functions that call the new content states.