AnimationEffectTimingProperties.iterations

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.

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

[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(), and KeyframeEffect() all accept an object of timing properties including this one.
• The value of this property corresponds to the one in AnimationEffectTimingReadOnly (which is the timing object for AnimationEffectReadOnly, KeyframeEffectReadOnly, and KeyframeEffect).
• CSS's animation-iteration-count