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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Dynamic HTML: Filters and Transitions

The most important is because they don’t require script. Another benefit of filters is that they are easier to author and can be applied to entire classes of ajd, because they use the declarative and inherited syntax of CSS.

The script then sets an alternative image and calls the play method on the filter to proceed with the transition. The following sample shows two filters, Alpha and Glow yransitions, and two timer methods.

Filters and Transitions

Some filters use transparency to create a visual effect. The following example shows a set of div elements cycling through a series of transitions. Filters are a convenient package for the same functionality that scripting provides. The Light filter is a complex visual filter.

To see the Filters and Transitions Interactive Demo, which demonstrates most of the filters and transitions, click the following button. For complex filter manipulation, you must keep track of the current states of the filter collections.


CSS Filters – Text and Image Effects

The following sample shows how you can combine the filter with mouse events to create a unique Web browsing experience. Using filters simplifies the task of incorporating sophisticated effects in Web documents. The transitikns meta tag causes the Blinds transition to play when the user loads the page, lasting four seconds; the second meta tag causes a Slide transition to play when the user exits the page, lasting 2.

Another option is to wrap the changes in a larger object and apply the transition to the larger object. A transition’s apply method freezes the appearance of an object when applying a transition.

You can use the onfilterchange event to coordinate moving or resizing the content. Changing the src property is effectively asynchronous. Opacity is expressed as a percentage.

However, doing so causes some filters to change when the window is resized by the user. The collection can be accessed like any other object model collection. Writing to this property is useful to change an object’s filters dynamically. To ensure updates are performed for each cycle of the script, use an onfilterchange event handler to delay changes in opacity until the browser has rendered the last update.

This is important for filters and transitions that have common properties and methods, such as the Color and play properties. The Style object also has a filter property.


Filters and Transitions

If true, all opaque pixels of the object have a dropshadow. Changing the innerText property of an object is synchronous—the action is completed by the time the statement executes. 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 content.

The BasicImage and MotionBlur filters are both applied to the object. If it is a transparent image, then glow is created around the opaque pixels of it.

If true, the image is added to the blurred image; and if false, the image is not added to the blurred image. The default is 5 pixels. Like other object model collections, the filters collection supports several kinds of transiions. 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. Positive integers move the drop shadow to the right, negative integers move the drop shadow to the left. Clicking the button runs the doTrans script, transiyions calls the apply method on the Blinds transition to stop painting the image.