This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The Web Animations API dictionary AnimationEffectTimingProperties
's iterations
property specifies the number of times the animation should repeat. The default value is 1, indicating that it should only play once, but you can set it to any floating-point value (including positive Infinity
defaults to 1
, and can also take a value of Infinity
to make it loop infinitely.
Element.animate()
, KeyframeEffectReadOnly()
, and KeyframeEffect()
all accept an object of timing properties including iterations
. The value of iterations
corresponds directly to AnimationEffectTimingReadOnly.iterations
in timing
objects returned by AnimationEffectReadOnly
, KeyframeEffectReadOnly
, and KeyframeEffect
.
Syntax
var timingProperties = { iterations: numberOfIterations }; timingProperties.iterations = numberOfIterations;
Value
A floating-point value specifying the number of times the animation sequence will play through. Any value from 0 (don't play the animation at all) to positive Infinity
(run the animation indefinitely) is supported. Defaults to 1, meaning the animation sequence plays through once then stops automatically.
Exceptions
TypeError
- An attempt was made to set the value of this property to a negative number or
NaN
. The property's value is left unchanged.
Examples
In the Forgotten Key example, Alice waves her arm up and down the entire time the page is open by passing Infinity
as the value for her iterations
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 'iterations' in that specification. |
Working Draft | Editor's draft. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | (Yes) | 48 (48)[1] | No support | (Yes) | No support |
Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|---|
Basic support | ? | ? | ? | 48.0 (48)[1] | ? | No support | No support | No support |
[1] The Web Animations API is only enabled by default in Firefox Developer Edition and Nightly builds. You can enable it in beta and release builds by setting the preference dom.animations-api.core.enabled
to true
, and can disable it in any Firefox version by setting this preference to false
.
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-iteration-count