SharedKeyframeList.constructor

The SharedKeyframeList() constructor of the SharedKeyframeList interface creates a new SharedKeyframeList object that can be shared across multiple KeyframeEffect objects.

Syntax

var sharedKeyframeSet = new sharedKeyframeList(keyframes);

Parameters

keyframes

An object representing a set of keyframes to be contained in the object.

There are two different ways to format keyframes:

1. An object containing key-value pairs consisting of the property to animate and an array of values to iterate over.

   element.animate({
     opacity: [ 0, 1 ],          // [ from, to ]
     color:   [ "#fff", "#000" ] // [ from, to ]
   }, 2000);
   

2. An array of objects (keyframes) consisting of properties and values to iterate over. This is the canonical format returned by the setKeyframes() method.

   element.animate([ 
     { // from
       opacity: 0,
       color: "#fff"
     }, 
     { // to
       opacity: 1,
    ​   color: "#000"
     }
   ], 2000);

   With this latter form it is also possible to specify offsets for each keyframe by providing an offset value.

   element.animate([ { opacity: 1 },
                     { opacity: 0.1, offset: 0.7 },
                     { opacity: 0 } ],
                   2000);
   

   offset values, if provided, must be between 0.0 and 1.0 and arranged in ascending order.

   Furthermore, using this form it is also possible to specify easing to apply between keyframes by providing an easing value as illustrated below.

   element.animate([ { opacity: 1, easing: 'ease-out' },
                     { opacity: 0.1, easing: 'ease-in' },
                     { opacity: 0 } ],
                   2000);
   

   In this example, the specified easing only applies from the keyframe where it is specified until the next keyframe. Any easing value specified on the options argument, however, applies across the entire duration of a single iteration of the animation.

Specifications

Specification	Status	Comment
Web Animations The definition of 'SharedKeyframeList()' in that specification.	Working Draft	Editor's draft.

Browser compatibility

See also

• Web Animations API
• SharedKeyframeList
• KeyframeEffect