EffectTiming.direction
Experimental
This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The direction
property of the Web Animations API dictionary
EffectTiming
indicates an animation's playback direction along its
timeline, as well as its behavior when it reaches the end of an iteration
Element.animate()
,
KeyframeEffectReadOnly()
, and KeyframeEffect()
all accept an object of timing properties including
direction.
The value of direction
corresponds directly
to AnimationEffectTimingReadOnly.direction
in
timing
objects returned by
AnimationEffectReadOnly
, KeyframeEffectReadOnly
, and
KeyframeEffect
.
Syntax
var timingProperties = {
direction: "normal" | "reverse" | "alternate" | "alternate-reverse"
};
timingProperties.direction = "normal" | "reverse" | "alternate" | "alternate-reverse";
Value
A DOMString
which specifies the direction in which the animation should
play as well as what to do when the playback reaches the end of the animation sequence
in the current direction. It can take one of the following values, with the default
being "normal"
:
"normal"
- The animation runs forwards, from beginning to end, in the way we experience the flow of time.
"reverse
"- The animation runs backwards, or "rewinds."
"alternate"
- The animation switches direction after each iteration, going forward through the animation sequence the first iteration, then backward through the sequence the second iteration, and so forth.
"alternate-reverse"
- Similar to "alternate", except the animation playback starts by going from the end of the animation sequence toward the beginning the first iteration, then goes forward during the second, and so forth.
Examples
In the Forgotten
Key example, Alice waves her arm up and down by passing her an
alternate
value for her direction
property:
// Get Alice's arm, and wave it up and down
document.getElementById("alice_arm").animate([
{ transform: 'rotate(10deg)' },
{ transform: 'rotate(-40deg)' }
], {
easing: 'steps(2, end)',
iterations: Infinity,
direction: 'alternate',
duration: 600
});
Specifications
Specification | Status | Comment |
---|---|---|
Web Animations The definition of 'direction' in that specification. |
Working Draft | Editor's draft. |
Browser compatibility
BCD tables only load in the browser
See also
- Web Animations API
Element.animate()
,KeyframeEffectReadOnly()
, andKeyframeEffect()
all accept an object of timing properties including this one.- The value of this property corresponds to the one in
AnimationEffectTimingReadOnly
(which is thetiming
object forAnimationEffectReadOnly
,KeyframeEffectReadOnly
, andKeyframeEffect
). -
CSS's
animation-direction