WebKitAnimationEvent Class Reference

Inherits from
Event
Availability
Available in Safari 4.0 and later.
Available in iOS 2.0 and later.
Companion guide
Safari CSS Visual Effects Guide

Overview

WebKitAnimationEvent objects encapsulate information about running animations.

Several animation related events are available through the DOM Event system. The start and end of an animation, and the end of each iteration of an animation all generate DOM events. An element can have multiple properties that are animated simultaneously. This simultaneous animation can occur either by setting a single -webkit-animation-name value with keyframes containing multiple properties, or by setting multiple -webkit-animation-name values. For the purposes of event dispatching, each CSS -webkit-animation-name property specifies a single animation. Therefore, an event is sent for each -webkit-animation-name property, not necessarily for each CSS property that is animated.

Each event contains the duration of the animation. This allows the event handler to determine the current iteration of a looping animation or the current position of an alternating animation. This duration does not include time the animation was in the paused play state.

Types of Animation Events

The type property of an animation event can have the following string values:

webkitAnimationStart

Occurs at the start of an animation. It can bubble and be canceled. Its animationName property is set.

webkitAnimationEnd

Occurs when the animation finishes. It can bubble and be canceled. Its animationName and elapsedTime properties are set.

webkitAnimationIteration

Occurs at the end of each iteration of an animation when the -webkit-animation-iteration-count is greater than 1. It does not occur for animations with an iteration count of 1. It can bubble and be canceled. Its animationName and elapsedTime properties are set.

Tasks

Accessing Properties

Initializing Objects

Properties

animationName

The name of the animation. The value of the CSS -webkit-animation-name property of the animation that caused the event.

readonly attribute DOMString animationName;
Availability

elapsedTime

The duration of the animation, in seconds, since this event was sent, excluding any time the animation is paused. This value is not affected by the value of the CSS -webkit-animation-delay property. If the type of the event is webkitAnimationStart, elapsedTime is 0.

readonly attribute double elapsedTime;
Availability

Methods

initWebKitAnimationEvent

Initializes a new animation event object.

void initWebKitAnimationEvent(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString animationNameArg, in double elapsedTimeArg);
Parameters
typeArg

The type of event. See “Types of Animation Events” for possible values.

canBubbleArg

Determines whether the event can bubble. Pass true if it can bubble; otherwise, false.

cancelableArg

Determines whether the event’s default action can be prevented. Pass true if it can be prevented; otherwise, false.

animationNameArg

The name of the animation associated with this event.

elapsedTimeArg

The duration of the animation, in seconds, since the event was sent.

Discussion

You use this method to initialize the value of a WebKitTransitionEvent object that is created through the DocumentEvent interface. This method can only be invoked before the WebKitTransitionEvent object is dispatched via the dispatchEvent method (although it can be invoked multiple times during that phase, if necessary). If it is invoked multiple times, the final invocation takes precedence.

Availability
  • Available in Safari 4.0 and later.
  • Available in iOS 2.0 and later.


© 2010 Apple Inc. All Rights Reserved. (Last updated: 2010-02-24)

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