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@mojs/player – npm

GUI player to control your animations.


Player controls for mojs. Intended to help you to craft mojs animation sequences. To be clear, this player is not needed to play mojs animations. It is just a debug tool that gives you the ability to:

  • control your sequences with GUI while working on them
  • it saves the current progress of your animation thus you don't loose the focus
  • it gives you bounds to constrain focus point of your animation
  • it gives you the control over the speed of animation
  • it gives you the ability to seek animations freely
  • it saves player's state and settings thus they not get lost when page reloaded


The MojsPlayer depends on mojs >= 0.225.2 so make sure you link it first.

# cdn
<script src=""></script>

# npm
npm i @mojs/player

Import MojsPlayer constructor to your code, depending on your environment:

const MojsPlayer = require('mojs-player').default;

// or
import MojsPlayer from '@mojs/player';

If you installed it with script link — you should have MojsPlayer global


Construct MojsPlayer and pass your main Tween/Timeline to the add option:

// create the timeline
const mainTimeline = new mojs.Timeline({});

// add the timeline to the player
const mojsPlayer = new MojsPlayer({
  add: mainTimeline

The add option is the only required option to launch: player's controls should appear at the bottom of the page when ready

You can also set other player initial state:

const mojsPlayer = new MojsPlayer({

  // required
  add:          mainTimeline,

  // optionally
  className:    '',         // class name to add to main HTMLElement
  isSaveState:  true,       // determines if should preserve state on page reload
  isPlaying:    false,      // playback state
  progress:     0,          // initial progress
  isRepeat:     false,      // determines if it should repeat after completion
  isBounds:     false,      // determines if it should have bounds
  leftBound:    0,          // left bound position  [0...1]
  rightBound:   1,          // right bound position [0...1]
  isSpeed:      false,      // determines if speed control should be open
  speed:        1,          // `speed` value
  isHidden:     false,      // determines if the player should be hidden
  precision:    0.1,        // step size for player handle - for instance, after page reload - player should restore timeline progress - the whole timeline will be updated incrementally with the `precision` step size until the progress will be met.
  name:         'mojs-player', // name for the player - mainly used for localstorage identifier, use to distinguish between multiple local players
  onToggleHide(isHidden) {  // should be called after user taps on the hide-button (isHidden is a boolean, indicating the visibility state of the player)
    if (isHidden) {
      // do something when player is invisible
    } else {
      // do something when player is visible


  • alt + p - toggle play/pause playback state
  • alt + - - decrease progress by 1/100
  • alt + + - increase progress by 1/100
  • shift + alt + - - decrease progress by 1/10
  • shift + alt + + - increase progress by 1/10
  • alt + s - stop playback
  • alt + r - toggle repeat state
  • alt + b - toggle bounds state
  • alt + h - toggle show/hide player state
  • alt + q - reset speed to 1x
  • alt + 2 - decrease speed by 1/50
  • alt + 3 - increase speed by 1/50
  • shift + alt + 2 - decrease speed by 1/10
  • shift + alt + 3 - increase speed by 1/10


Install webpack globally:

[sudo] npm install webpack -g

Install dependencies with npm:

[sudo] npm install

Run webpack:


Please make sure you are on the dev branch before making changes.