animejs

What is animejs?

Anime.js is a lightweight JavaScript animation library with a simple, yet powerful API. It works with CSS properties, SVG, DOM attributes, and JavaScript Objects.

What are animejs's main functionalities?

Basic Animation

This feature allows you to animate basic properties like translation, rotation, and background color of a DOM element.

anime({
  targets: 'div',
  translateX: 250,
  rotate: '1turn',
  backgroundColor: '#FFF',
  duration: 800
});

Timeline Control

Timelines allow you to create complex animation sequences with precise control over the timing of each animation.

var tl = anime.timeline({
  easing: 'easeOutExpo',
  duration: 750
});

tl.add({
  targets: '.box',
  translateX: 250
}).add({
  targets: '.box',
  translateY: 250,
  offset: '-=500' // Starts 500ms before the previous animation ends
});

SVG Animations

Anime.js can animate SVG properties, allowing for intricate and visually appealing vector animations.

anime({
  targets: 'path',
  strokeDashoffset: [anime.setDashoffset, 0],
  easing: 'easeInOutSine',
  duration: 1500,
  delay: function(el, i) { return i * 250 },
  direction: 'alternate',
  loop: true
});

Keyframes

Keyframes allow you to define multiple stages of an animation, giving you more control over the animation sequence.

anime({
  targets: '.box',
  keyframes: [
    {translateX: 250},
    {translateY: 250},
    {translateX: 0},
    {translateY: 0}
  ],
  duration: 4000,
  easing: 'easeOutElastic(1, .8)',
  loop: true
});

Other packages similar to animejs

gsap

GSAP (GreenSock Animation Platform) is a powerful JavaScript library for creating high-performance animations. It offers more features and plugins compared to Anime.js, making it suitable for more complex animations.

velocity-animate

Velocity is an animation engine with the same API as jQuery's $.animate(). It is designed for fast performance and is a good alternative for those who are familiar with jQuery animations.

popmotion

Popmotion is a functional, flexible JavaScript animation library. It provides a more functional approach to animations compared to Anime.js, making it a good choice for developers who prefer functional programming paradigms.

README

anime.js

Anime (/ˈæn.ə.meɪ/) is a lightweight JavaScript animation library. It works with any CSS Properties, individual CSS transforms, SVG or any DOM attributes, and JavaScript Objects.

⚠️ Migrating from v1.x ? Make sure to read the changelog ⚠️

Main features

• Keyframes: Chain multiple animation properties.
• Timeline: Synchronize multiple instances together.
• Playback controls: Play, pause, restart, seek animations or timelines.
• CSS transforms: Animate CSS transforms individually.
• Function based values: Multiple animated targets can have individual value.
• SVG Animations: Motion path, line drawing and morphing animations.
• Easing functions: Use the built in functions or create your own Cubic Bézier curve easing.

Demos and examples

• CodePen demos and examples
• juliangarnier.com
• animejs.com
• kenzo.com/en/thejunglebook
• Stress test

Browser support

Chrome	Safari	IE / Edge	Firefox	Opera
24+	6+	10+	32+	15+

Usage

$ npm install animejs
# OR
$ bower install animejs

import anime from 'animejs'

Or manually download and link anime.min.js in your HTML:

<script src="anime.min.js"></script>

Then start animating:

anime({
  targets: 'div',
  translateX: [
    { value: 100, duration: 1200 },
    { value: 0, duration: 800 }
  ],
  rotate: '1turn',
  backgroundColor: '#FFF',
  duration: 2000,
  loop: true
});

API

Targets

The targets property defines the elements or JS Objects to animate.

Types	Examples
CSS Selectors	'div', '.item', 'path', '#el path' ...
DOM Element	document.querySelector('.item')
NodeList	document.querySelectorAll('.item')
Object	{prop1: 100, prop2: 200}
Array	['div', '.item', domNode]

➜ Targets examples

Animatable properties

Types	Examples
CSS	opacity, backgroundColor, fontSize ...
Transforms	translateX, rotate, scale ...
Object properties	Any Object property containing numerical values
DOM attributes	Any DOM attributes containing numerical values
SVG attributes	Any SVG attributes containing numerical values

➜ Animatable properties examples

CSS

Any CSS properties can be animated:

anime({
  targets: 'div',
  left: '80%', // Animate all divs left position to 80%
  opacity: .8, // Animate all divs opacity to .8
  backgroundColor: '#FFF' // Animate all divs background color to #FFF
});

➜ CSS properties example

Individual CSS transforms

CSS transforms can be animated individually:

anime({
  targets: 'div',
  translateX: 250, // Animate all divs translateX property to 250px
  scale: 2, // Animate all divs scale to 2
  rotate: '1turn' // Animate all divs rotation to 1 turn
});

➜ CSS Transforms example

JavaScript Object properties

Any Object property containing a numerical value can be animated:

var myObject = {
  prop1: 0,
  prop2: '0%'
}

anime({
  targets: myObject,
  prop1: 50, // Animate the 'prop1' property from myObject to 50
  prop2: '100%' // Animate the 'prop2' property from myObject to 100%
});

➜ Object properties example

DOM Attributes

Any DOM Attribute containing a numerical values can be animated:

<input value="0">

anime({
  targets: input,
  value: 1000 // Animate the input value to 1000
  round: 1 // Remove decimals by rounding the value
});

➜ DOM Attributes example

SVG Attributes

Any SVG Attribute containing a numerical values can be animated:

<svg width="128" height="128" viewBox="0 0 128 128">
  <polygon points="64 68.73508918222262 8.574 99.9935923731656 63.35810017508558 67.62284396863708 64 3.993592373165592 64.64189982491442 67.62284396863708 119.426 99.9935923731656"></polygon>
</svg>

anime({
  targets: 'polygon',
  points: '64 128 8.574 96 8.574 32 64 0 119.426 32 119.426 96'
});

➜ SVG Attributes example

Property parameters

Defines duration, delay and easing for each property animations.
Can be set globally, or individually to each properties:

Names	Defaults	Types	Info
duration	1000	number, function	millisecond
delay	0	number, function	millisecond
easing	'easeOutElastic'	function	See Easing functions
elasticity	500	number, function	Range [0 - 1000]
round	false	number, boolean, function	Power of 10

anime({
  translateX: {
    value: 250,
    duration: 800
  },
  rotate: {
    value: 360,
    duration: 1800,
    easing: 'easeInOutSine'
  },
  scale: {
    value: 2,
    duration: 1600,
    delay: 800,
    easing: 'easeInOutQuart'
  },
  delay: 250 // All properties except 'scale' inherit 250ms delay
});

➜ Property parameters examples

Function based property parameters

Get different property parameters for every target of the animation.
The function accepts 3 arguments: target, index, targetsLength.

anime({
  targets: 'div',
  translateX: 250,
  rotate: 180,
  duration: function(target) {
    // Duration based on every div 'data-duration' attribute
    return target.getAttribute('data-duration');
  },
  delay: function(target, index) {
    // 100ms delay multiplied by every div index, in ascending order
    return index * 100;
  },
  elasticity: function(target, index, totalTargets) {
    // Elasticity multiplied by every div index, in descending order
    return 200 + ((totalTargets - index) * 200);
  }
});

➜ Function based parameters examples

Animation parameters

Parameters relative to the animation to specify the direction, the number of loops or autoplay.

Names	Defaults	Types
loop	false	number, boolean
direction	'normal'	'normal', 'reverse', 'alternate'
autoplay	true	boolean

anime({
  targets: 'div',
  translateX: 100,
  duration: 2000,
  loop: 3, // Play the animation 3 times
  direction: 'reverse', // Play the animation in reverse
  autoplay: false // Animation paused by default
});

➜ Animation parameters examples

Property values

Single value

Defines the end value of the animation.
Start value is the original target value, or default transforms value.

Types	Examples	Infos
Number	100	Automatically add original or default unit if needed
String	'10em', '1turn', 'M21 1v160', '50%'	Must contains at least one numerical value
Relative values	'+=100px', '-=20em', '*=4'	Add, subtract or multiply the original property value
Colors	'#FFF', 'rgb(255,0,0)', 'hsl(100, 20%, 80%)'	Accepts 3 or 6 hex digit, rgb, or hsl values

➜ Values examples

anime({
  targets: 'div',
  translateX: 100, // Add 'px' by default (from 0px to 100px)
  rotate: '1turn', // Use 'turn' as unit (from 0turn to 1turn)
  scale: '*=2', // Multiply the current scale value by 2 (from 1 to (1 * 2))
  backgroundColor: '#FFF', // Animate the background color to #FFF (from 'rgb(0,0,0)' to 'rgb(255,255,255)')
  duration: 1500
});

From > To values

Force the animation to start at a certain value.

anime({
  targets: 'div',
  translateX: [100, 200], // Translate X from 100 to 200
  rotate: ['.5turn', '1turn'], // Rotate from 180deg to 360deg
  scale: ['*=2', 1], // Scale from 2 times the original value to 1,
  backgroundColor: ['rgb(255,0,0)', '#FFF'], // Will transition the background color from red to white
  duration: 1500
});

➜ Specific initial value example

Function based values

Same as function based property parameters.
Get different values for every target and property of the animation.
The function accepts 3 arguments: target, index, targetsLength.

anime({
  targets: 'div',
  translateX: function(el) {
    return el.getAttribute('data-x');
  },
  translateY: function(el, i) {
    return 50 + (-50 * i);
  },
  scale: function(el, i, l) {
    return (l - i) + .25;
  },
  rotate: function() { return anime.random(-360, 360); },
  duration: function() { return anime.random(800, 1600); },
  delay: function() { return anime.random(0, 1000); }
});

➜ Function based value example

Keyframes

Keyframes are defined using an Array of property Object.
Instance's duration is divided by the number of keyframes of each properties if not specified.

anime({
  targets: 'div',
  translateX: [
    { value: 250, duration: 1000, delay: 500, elasticity: 0 },
    { value: 0, duration: 1000, delay: 500, elasticity: 0 }
  ],
  translateY: [
    { value: -40, duration: 500, elasticity: 100 },
    { value: 40, duration: 500, delay: 1000, elasticity: 100 },
    { value: 0, duration: 500, delay: 1000, elasticity: 100 }
  ],
  scaleX: [
    { value: 4, duration: 100, delay: 500, easing: 'easeOutExpo' },
    { value: 1, duration: 900, elasticity: 300 },
    { value: 4, duration: 100, delay: 500, easing: 'easeOutExpo' },
    { value: 1, duration: 900, elasticity: 300 }
  ],
  scaleY: [
    { value: [1.75, 1], duration: 500 },
    { value: 2, duration: 50, delay: 1000, easing: 'easeOutExpo' },
    { value: 1, duration: 450 },
    { value: 1.75, duration: 50, delay: 1000, easing: 'easeOutExpo' },
    { value: 1, duration: 450 }
  ]
});

➜ Specific keyframes properties example

Timeline

Basic timeline

Play animations in sequence by creating a timeline:

var myTimeline = anime.timeline();

A timeline accepts the same parameters as an animation: direction, loop and autoplay.

var myTimeline = anime.timeline({
  direction: 'alternate',
  loop: 3,
  autoplay: false
});

Add animations to the timeline with .add() :

myTimeline
  .add({
    targets: '.square',
    translateX: 250
  })
  .add({
    targets: '.circle',
    translateX: 250
  })
  .add({
    targets: '.triangle',
    translateX: 250
  });

Access timeline children animations with myTimeline.children

➜ Basic timeline example

Timeline animations offsets

offset defines the starting time of an animation on the timeline.

Relative offset

Defines starting time relative to the previous animations duration.

Types	Examples	Infos
+=	'+=100'	Starts 100ms after the previous animation ends
-=	'-=100'	Starts 100ms before the previous animation ends
*=	'*=2'	Starts at 2 times the previous animations duration

myTimeline
  .add({
    targets: '.square',
    translateX: 250
  })
  .add({
    targets: '.circle',
    translateX: 250,
    offset: '-=600' // Starts 600ms before the previous animation ends
  })
  .add({
    targets: '.triangle',
    translateX: 250,
    offset: '-=800' // Starts 800ms before the previous animation ends
  });

➜ Relative offset example

Absolute offset

Defines an absolute starting time on the timeline with a number.

myTimeline
  .add({
    targets: '.square',
    translateX: 250,
    offset: 1000 // Starts at 1000ms
  })
  .add({
    targets: '.circle',
    translateX: 250,
    offset: 500 // Starts at 500ms
  })
  .add({
    targets: '.triangle',
    translateX: 250,
    offset: 0 // Starts at 0ms
  });

➜ Absolute offset example

Playback controls

Play, pause, restart, seek animations or timelines.

Play / Pause

var playPauseAnim = anime({
  targets: 'div',
  translateX: 250,
  direction: 'alternate',
  loop: true,
  autoplay: false // prevent the instance from playing
});

playPauseAnim.play(); //  Manually play
playPauseAnim.pause(); //  Manually pause

➜ Play / Pause example

Restart

var restartAnim = anime({
  targets: 'div',
  translateX: 250,
  direction: 'alternate',
  loop: true,
  autoplay: false
});

restartAnim.restart(); // Restart the animation and reset the loop count / current direction

➜ Restart example

Reverse

var reverseAnim = anime({
  targets: 'div',
  translateX: 250,
  direction: 'alternate',
  loop: true
});

reverseAnim.reverse(); // Change the animation direction

➜ Reverse example

Seek

Change animations or timelines current time.

var seekAnim = anime({
  targets: 'div',
  translateX: 250,
  delay: function(el, i, l) { return i * 100; },
  elasticity: 200,
  autoplay: false
});

seekAnim.seek(500); // Set the animation current time to 500ms

➜ Seek example

Callbacks

Execute a function at the beginning, during or when an animation or timeline is completed.

Names	Types	Arguments	Info
update	function	animation Object	Called at time = 0
begin	function	animation Object	Called after animation delay is over
complete	function	animation Object	Called only after all the loops are completed

➜ Callbacks examples

Update

update() is called on every frame while the instance is playing.

var myAnimation = anime({
  targets: '#update .el',
  translateX: 250,
  delay: 1000,
  update: function(anim) {
    console.log(anim.currentTime + 'ms'); // Get current animation time with `myAnimation.currentTime`, return value in ms.
    console.log(anim.progress + '%'); // Get current animation progress with `myAnimation.progress`, return value in %
  }
});

➜ Update example

Begin

begin() is called once after the delay is finished.

var myAnimation = anime({
  targets: '#begin .el',
  translateX: 250,
  delay: 1000,
  begin: function(anim) {
    console.log(anim.began); // true after 1000ms
  }
});

Check if the animation has begun with myAnimation.began, return true or false.

➜ Begin example

Run

run() is called every frame after the delay is finished.

var myAnimation = anime({
  targets: '#run .el',
  translateX: 250,
  delay: 1000,
  run: function(anim) {
    console.log(anim.currentTime);
  }
});

➜ Run example

Complete

complete() is called once after the animation is finished.

var myAnimation = anime({
  targets: '#complete .el',
  translateX: 250,
  complete: function(anim) {
    console.log(anim.completed);
  }
});

Check if the animation has finished with myAnimation.completed, return true or false.

➜ Complete example

Promises

myAnimation.finished returns a Promise object which will resolve once the animation has finished running.

➜ Promises example

SVG

Motion path

Translate and rotate DOM elements along an SVG path:

// Create a path `Object`
var path = anime.path('#motionPath path');

var motionPath = anime({
  targets: '#motionPath .el',
  translateX: path('x'), // Follow the x values from the path `Object`
  translateY: path('y'), // Follow the y values from the path `Object`
  rotate: path('angle')  // Follow the angle values from the path `Object`
});

➜ Motion path example

Morphing

Animate the transition between two SVG shapes:

<svg class="shape" width="128" height="128" viewBox="0 0 128 128">
  <polygon points="64 68.64 8.574 100 63.446 67.68 64 4 64.554 67.68 119.426 100"></polygon>
</svg>

var svgAttributes = anime({
  targets: '.shape polygon',
  points: '64 128 8.574 96 8.574 32 64 0 119.426 32 119.426 96'
});

Shapes need to have the same number of points.

➜ Morphing example

Line drawing

Line drawing animation of an SVG shape:

anime({
  targets: '.shape path',
  strokeDashoffset: [anime.setDashoffset, 0]
});

➜ Line drawing example

Easing functions

The easing parameter can accept either a string or a custom Bézier curve coordinates (array).

Types	Examples	Infos
String	'easeOutExpo'	Built in function names
Array	[.91,-0.54,.29,1.56]	Custom Bézier curve coordinates ([x1, y1, x2, y2])

Built in functions

Linear easing: 'linear'

Penner's equations:

easeIn	easeOut	easeInOut
easeInQuad	easeOutQuad	easeInOutQuad
easeInCubic	easeOutCubic	easeInOutCubic
easeInQuart	easeOutQuart	easeInOutQuart
easeInQuint	easeOutQuint	easeInOutQuint
easeInSine	easeOutSine	easeInOutSine
easeInExpo	easeOutExpo	easeInOutExpo
easeInCirc	easeOutCirc	easeInOutCirc
easeInBack	easeOutBack	easeInOutBack
easeInElastic	easeOutElastic	easeInOutElastic

➜ Built in easing functions examples

Usage:

anime({
  targets: 'div',
  translateX: 100,
  easing: 'easeOutExpo' // Default 'easeOutElastic'
});

Elasticity of Elastic easings can be configured with the elasticity parameters:

anime({
  targets: 'div',
  translateX: 100,
  easing: 'easeOutElastic',
  elasticity: 600 // Default 500, range [0-1000]
});

➜ Elasticity examples

Custom Bézier curves

Define a Bézier curve with an Array of 4 coordinates:

anime({
  targets: 'div',
  translateX: 100,
  easing: [.91,-0.54,.29,1.56]
});

Custom Bézier curves coordinates can be generated here https://matthewlein.com/ceaser/

➜ Custom Bézier curves example

Defining custom functions

Expand the built in easing functions from anime.easings.

// Add custom function
anime.easings['myCustomEasingName'] = function(t) {
  return Math.pow(Math.sin(t * 3), 3);
}

// Usage
anime({
  targets: 'div',
  translateX: 100,
  easing: 'myCustomEasingName'
});

// add custom Bézier curve function
anime.easings['myCustomCurve'] = anime.bezier([.91,-0.54,.29,1.56]);

// Usage
anime({
  targets: 'div',
  translateX: 100,
  easing: 'myCustomCurve'
});

➜ Custom easing functions example

Helpers

anime.speed = x

Change all animations speed (from 0 to 1).

anime.speed = .5; // Slow down all animations by half of their original speed

anime.running

Return an Array of all active Anime instances.

anime.running;

anime.remove(target)

Remove one or multiple targets from the animation.

anime.remove('.item-2'); // Remove all elements with the class 'item-2'

anime.getValue(target, property)

Get current valid value from an element.

anime.getValue('div', 'translateX'); // Return '100px'

anime.path(pathEl)

Create a path Function for motion path animation.
Accepts either a DOM node or CSS selector.

var path = anime.path('svg path', 'translateX'); // Return path(attribute)

➜ Motion path example

anime.setDashoffset(pathEl)

An helper for line drawing animation.
Sets the 'stroke-dasharray' to the total path length and return its value.

anime({
  targets: '.shape path',
  strokeDashoffset: [anime.pathDashoffset, 0]
});

➜ Line drawing example

anime.easings

Return the complete list of built in easing functions

anime.easings;

anime.bezier(x1, x2, y1, y2)

Return a custom Bézier curve easing function

anime.bezier(x1, x2, y1, y2); // Return function(t)

anime.timeline()

Create a timeline to synchronise other Anime instances.

var timeline = anime.timeline();
timeline.add([instance1, instance2, ...]);

➜ Timeline examples

anime.random(x, y)

Generate a random number between two numbers.

anime.random(10, 40); // Will return a random number between 10 and 40

====

MIT License. © 2017 Julian Garnier.

Thanks to Animate Plus and Velocity that inspired anime.js API, BezierEasing and jQuery UI for the easing system. Tim Branyen For the Promise implementation.