JOS : Animation Library

A simple & easy to use animation library for web developers

Git Pages · Playground Demo · Report Bug · Request Feature

About This Project

JOS-Animation, Javascript On Scroll Animation library is a simple & easy to use animation library package to instantly add professional animation to your website. It was built to make my life easier while developing websites & comes with tons of features and is fully customizable. It is lightweight & has a very small footprint. The best part of all is that it has no (*minimum) toll on performance.

Open source, no download or tiring setup, just add a script tag (Embed).
Includes Preset and expert custom animation options.
Works with all major browsers & Platforms.
Fast, light and small with no/min toll on performance.
Simple & easy to setup for both beginners & experts.
Customize animation settings and build your own scroll invoked functions
And lots more stuff... explore it yourself.

This project is currently being developed by me & the dev community, So you can expect more features and updates quite often..

Was inpired by GSAP, AOS libraries. I wanted something easier to use, with great performance and wanted to make the implementation better. So I worked on this project from scratch.

Feel free to report an issue or request a feature in this repository :) & for more information, Check out the JOS Webpage.

Badges

<a
  target="\_blank"
  rel="noopener noreferrer nofollow"
  href="https://github.com/jesvijonathan/JOS-Animation-Library"
>
  <img
    src="https://cdn.jsdelivr.net/gh/jesvijonathan/JOS-Animation-Library@master/res/badge/jos_github%20default.svg"
    alt="JOS-Animation"
    style="max-width: 100%;"
/></a>

Video Tutorial

JOS V0.6 Cubes (Outdated | Latest : v0.9.1)

-

JOS V0.8.8 (Outdated | [Latest : v0.9.1](https://github.com/jesvijonathan/JOS-Animation-Library/releases/latest))

JOS v0.9.2 11 Nov 2023 Jesvi Jonathan

Built With

JavaScript
CSS

Installation

Add the <link> inside the <head> tag : (this step is not required from v0.9 onwards)

<link
  id="jos-stylesheet"
  rel="stylesheet"
  href="https://unpkg.com/jos-animation/dist/jos.css"
  crossorigin="anonymous"
/>

Add the <script> right after the <body> tag :

<script src="https://unpkg.com/jos-animation/dist/jos.min.js"></script>

You can add minified version of the script by replacing jos.js with jos.min.js in the above script tag.

jos.js for basic.
jos.min.js for production use.
jos.debug.js for debugging along with some other function

From v0.9 onwards, by default jos.js does not require you to add the stylesheet jos.css, it will be exported along with the script. But you can still add the stylesheet if you want to for some reason.

Version Tags

Latest : jos-animation@latest
Stable : jos-animation@0.8.8
Beta : jos-animation@0.9.0-beta.1

So it would be https://unpkg.com/jos-animation/@latest/dist/jos.js (embed) for the latest version. or jos-animation/@0.8.8/dist/jos.js (npm install) for a specific version.

Setup

Use JOS.init(); to initialize the library with default settings.

<!-- Initialize JOS with default settings -->
<script>
  JOS.init();
</script>

(Or) Use JOS.init(options); to overide the default settings with your custom settings.

<!-- Global Parameters -->
<script>
  JOS.init({
    // disable: false, // Disable JOS gloabaly | Values :  'true', 'false'
    debugMode: true, // Enable JOS debug mode | Values :  'true', 'false'
    passive: false, // Set the passive option for the scroll event listener | Values :  'true', 'false'

    once: false, // Disable JOS after first animation | Values :  'true', 'false' || Int : 0-1000
    animation: "fade", // JOS global animation type | Values :  'fade', 'slide', 'zoom', 'flip', 'fade-right', 'fade-left', 'fade-up', 'fade-down', 'zoom-in-right', 'zoom-in-left', 'zoom-in-up', 'zoom-in-down', 'zoom-out-right', 'zoom-out-left', 'zoom-out-up', 'zoom-out-down', 'flip-right', 'flip-left', 'flip-up', 'flip-down, spin, revolve, stretch, "my-custom-animation"
    // animationInverse: "static", // Set the animation type for the element when it is scrolled out of view | Values :  'fade', 'slide', 'zoom', 'flip', 'fade-right', 'fade-left', 'fade-up', 'fade-down', 'zoom-in-right', 'zoom-in-left', 'zoom-in-up', 'zoom-in-down', 'zoom-out-right', 'zoom-out-left', 'zoom-out-up', 'zoom-out-down', 'flip-right', 'flip-left', 'flip-up', 'flip-down, spin, revolve, stretch, "my-custom-animation"
    timingFunction: "ease-in-out", // JOS global timing function | Values :  'ease', 'ease-in', 'ease-out', 'ease-in-out', 'linear', 'step-start', 'step-end', 'steps()', 'cubic-bezier()', 'my-custom-timing-function'
    //mirror : false, // Set whether the element should animate back when scrolled out of view | Values :  'true', 'false'
    threshold: 0, // Set gloabal the threshold for the element to be visible | Values :  0-1
    delay: 0, // Set global the delay for the animation to start | Values :  0,1,2,3,4,5
    duration: 0.7, // Set global the duration for the animation playback | Values :  flota : 0-1 & int : 0,1,2,3,4,5

    // startVisible: "true", // Set whether the element should animate when the page is loaded | Values :  'true', 'false' || MS : 0-10000
    // scrollDirection: "down", // Set the scroll direction for the element to be visible | Values :  'up', 'down', 'none'
    //scrollProgressDisable: true // disable or enable scroll callback function | Values :  'true', 'false'
    // intersectionRatio: 0.4, // Set the intersection ratio between which the element should be visible | Values :  0-1 (automaticaly set)
    // rootMargin_top: "0%", // Set by which percent the element should animate out (Recommended value between 10% to -30%)
    // rootMargin_bottom: "-50%", // Set by which percent the element should animate out (Recommended value between -10% to -60%)
    // rootMargin: "0% 0% -50% 0%", // Set the root margin for the element to be visible | Values :  _% _% _% _%  (automaticaly set)
  });
</script>

Set class="jos" to the element you want to animate :

<!-- JOS class is required to animate the element -->
<div class="jos"></div>

Set data-jos *attributes to customize the element you want to animate,
(although these attributes are optional and will work without them) :

<!-- JOS attributes are optional and will work without them (class="jos" is mandatory). these attributes can be used to customize the animation of the element -->
<div
  class="jos"
  data-jos_animation="zoom"
  data-jos_once="false"
  data-jos_duration="0.4"
  data-jos_delay="0.1"
  data-jos_timing-function="ease-in-out"
  data-jos_mirror="true"
  data-jos_rootMargin="0% 0% -50% 0%"
  data-jos_rootMargin_top="-10%"
  data-jos_rootMargin_bottom="-50%"
  data-jos_scrollDirection="down"
  data-jos_startVisible="false"
  data-jos_threshold="0.4"
  data-jos_passive="false"
  data-jos_invoke="myCustomFunction"
  data-jos_invoke_out="myCustomFunction_onExit"
  data-jos_scroll="your_callbackFunction"
  data-jos_anchor="#elementID"
></div>

See JOS Props for full information regarding the animation, attributes, and options.

Custom Animation

Create a custom animation by adding the following code to your stylesheet :

/* Custom animation class name starts with 'jos-' keyword followed by the animation name*/
.jos-my-custom-animation {
  /* Set the initial state of the element */
}

Use your cutom animation by setting the data-jos_animation attribute to my-custom-animation :

<div class="jos" data-jos_animation="my-custom-animation"></div>

Example : Custom Animation

Custom Inverse Animation

Create a custom inverse animation by adding the following code to your stylesheet :

/* Custom inverse animation class name starts with 'jos-' keyword followed by the animation name*/
.jos-my-custom-animation-inverse {
  /* Set the initial state of the element */
}

Use your cutom inverse animation by setting the data-jos_animationInverse attribute to my-custom-animation-inverse :

<div class="jos" data-jos_animationInverse="my-custom-animation-inverse"></div>

This is especially useful when you want to animate an element when it is scrolled out of its rootMargin, this gives more customizability for beautiful animations.

You can also use a combination of both data-jos_animation ("none", "static", no-transition, etc) & data-jos_animationInverse attributes to create a custom animation.

Example : Custom Inverse Animation

Playable Animation

Create a playable animation by adding the following code to your stylesheet :

/* Custom playable animation class name starts with 'jos-' keyword followed by the animation name*/

/* My Custom Playable Animation */
.jos-my-custom-animation {
  transition: 1s;
  animation: jos-my-custom-animation 1s ease-in-out infinite;
  transform: translateX(100px);
}
/* Add Keyframes */
@keyframes jos-my-custom-animation {
  0% {
    opacity: 1;
  }

  50% {
    transform: translateX(-100px);
  }
}

Use the playable animation by setting the data-jos_animation attribute to my-custom-animation & data-jos_animationInverse attribute to my-custom-animation-play :

<div
  class="jos"
  data-jos_animation="my-custom-animation"
  data-jos_animationinverse="static"
></div>

Here the data-jos_animationinverse attribute is set to static to prevent the element from animating out of view & to keep it in the final state. The Playable animation is triggered and starts playing when the element is scrolled into view.

Example : Playable Animation

Custom Timing Function

Create a custom timing function by adding the following code to your stylesheet :

/* Custom timing function attribute name starts with 'data-jos_timing_function' keyword & a custom name of your choice */
[data-jos_timing_function="myCustom-timingFunc"] {
  /* Set the timing of the element */
  transition-timing-function: cubic-bezier(0.2, 0.5, 0.2, 0.5) !important;
}

Use your cutom timing function by setting the data-jos_timing-function attribute to my-custom-timing-function :

<div class="jos" data-jos_timing-function="myCustom-timingFunc"></div>

Example : Custom Timing Function

Anchors to trigger animation

Create an element that you want to use as an anchor & add an id to it :

<!-- My reference anchor element -->
<div id="myElement"></div>

Create an element that you want to animate & add the data-jos_anchor attribute to it, with the id starting with suffix # :

<!-- My animated element -->
<div class="jos" data-jos_anchor="#myElement"></div>

This triggers the animation when the myElement element is scrolled into view.
This feature is useful especially when you want to animate an element which is in a fixed position.

Example : Anchor

Direction Based Animation

Create an element that you want to animate & add the data-jos_scrollDirection attribute to it :

<!-- My animated element -->
<div class="jos" data-jos_scrollDirection="down"></div>

This triggers the animation when the element is scrolled into view from the up to down direction.
& you can do the same for down to up direction.

This is partciluarly useful when you want to animate an element when it is scrolled into view from a particular direction.

Example : Direction Based Animation

Start Visible

Create an element that you want to have a visible state when the page is loaded & add the data-jos_startVisible attribute to it :

<!-- My animated element -->
<div class="jos" data-jos_startVisible="true"></div>

This sets the element to be visivle when the page is loaded. you can add a delay to it by setting the value in ms :

<!-- My animated element that is visivle with a given timer/delay in ms-->
<div class="jos" data-jos_startVisible="3000"></div>

This sets the element to be visivle when the page is loaded after 3000ms or instantly if the value is 0 (or) true.

This feature is useful especially when you want an element which is in a fixed position, or is present in the landing page to be at initially in a visible state with no animation .

Example : Start Visible

Create Custom Function

Create a custom function by adding the following code to your script :

// Create a custom function
function myCustomFunction() {
  // Do something
}

Use your cutom function by setting the data-jos_invoke attribute to myCustomFunction :

<div class="jos" data-jos_invoke="myCustomFunction"></div>

This triggers the myCustomFunction() function when the element is scrolled into view.

You can use data-jos_invoke_out attribute to trigger the function when the element is scrolled out of view.

Example : Custom Function

Scroll Progress Callback

Create an element that you want to animate & add the data-jos_scroll attribute to it :

<div id="elem1" class="jos" data-jos_scroll="your_callbackFunction">
  Scroll Trigger Element
</div>

Create a custom function by adding the following code to your script :

your_callbackFunction = (element) => {
  // windowScrollProgress : element scroll pixel
  console.log(element.id, element.jos.windowScrollProgress);
  // scrollProgress : 0-1
  element.style.opacity = element.jos.scrollProgress;
  // rootScrollProgress : +-0 to +-1
  element.style.innerHTML = element.jos.rootScrollProgress;
};

This triggers the your_callbackFunction() function when the element is scrolled. This way you can handle the scroll progress of the element.

Example : Custom Function

Staggering Animation

Create an parent element that you want to animate & add the data-jos_stagger attribute to it along with jos class :

<div
  class="jos parent_elem"
  id="stagger"
  data-jos_stagger="spin"
  data-jos_staggerinverse="none"
  data-jos_stagger_anchor="#elementID"
  data-jos_stagger_sequence="0.1"
  data-jos_stagger_delay="0"
  data-jos_stagger_duration="0.4"
  data-jos_stagger_timing-function="ease-in-out"
  data-jos_stagger_mirror="true"
  data-jos_stagger_rootMargin="0% 0% -50% 0%"
  data-jos_stagger_invoke="myCustomFunction"
  data-jos_stagger_invoke_out="myCustomFunction_onExit"
  data-jos_stagger_scroll="your_callbackFunction"
  data-jos_stagger_startVisible="false"
  data-jos_stagger_scrollDirection="down"
  data-jos_stagger_once="false"
>
  <!-- data-jos_stagger="true"        # this attribute along with 'jos' class in parent element is Required/Must to enable staggering -->
  <!-- data-jos_stagger_anchor="true" # auto sets parent element's id & uses it as a anchor's -->

  <!-- Element 1  -->
  <div class="child_elem"></div>
  <!-- Element 2  -->
  <div class="child_elem"></div>
  <!-- Element 3  -->
  <div class="child_elem"></div>
  <!-- Element n  -->
</div>

The data-jos_stagger attribute along with jos class in parent element is Required/Must to enable staggering even if you are using other attributes.

data-jos_stagger=true would auto asign id for parent element & use it as a anchor for child elements.
data-jos_stagger=#id would use the given id as a anchor for child elements.
not using data-jos_stagger_anchor make the element independent of the parent element.

data-jos_stagger_seq is used to set the delay between each element in the sequence (to trigger one after other) whereas data-jos_stagger_delay total delay for each element as a whole.

Example : Staggering Animation

JOS Attributes

Attribute	Type	Default	Description	Values
data-jos_animation	string	fade	Set the animation type for the element.	`fade`, `slide`, `zoom`, `flip`, `fade-right`, `fade-left`, `fade-up`, `fade-down`, `zoom-in-right`, `zoom-in-left`, `zoom-in-up`, `zoom-in-down`, `zoom-out-right`, `zoom-out-left`, `zoom-out-up`, `zoom-out-down`, `flip-right`, `flip-left`, `flip-up`, `flip-down`, `rotate`, `rotate-right`, `spin`, `spin-right`, `revolve`, `revolve-right`, `stretch`, `stretch-vertical`, `my-custom-animation`
data-jos_animationInverse	string	static	Set the Inverse animation type for the element.	`fade`, `slide`, `zoom`, `flip`, `fade-right`, `fade-left`, `fade-up`, `fade-down`, `zoom-in-right`, `zoom-in-left`, `zoom-in-up`, `zoom-in-down`, `zoom-out-right`, `zoom-out-left`, `zoom-out-up`, `zoom-out-down`, `flip-right`, `flip-left`, `flip-up`, `flip-down`, `rotate`, `rotate-right`, `spin`, `spin-right`, `revolve`, `revolve-right`, `stretch`, `stretch-vertical`, `my-custom-animation`
data-jos_once	boolean	false	Set whether the element should animate only once.	`true`, `false`
data-jos_delay	int	0	Set the delay for the animation to start.	`(float: 0-1)` & `(int: 0, 1, 2, 3, 4, 5)`
data-jos_duration	float	0.4	Set the duration for the animation playback.	`(float: 0-1)` & `(int: 0, 1, 2, 3, 4, 5)`
data-jos_timing-function	string	ease	Set the timing function for the animation playback.	`ease`, `ease-in`, `ease-out`, `ease-in-out`, `linear`, `step-start`, `step-end`, `steps(1, start)`, `steps(1, end)`, `cubic-bezier(0.1, 0.7, 1.0, 0.1)`, `my-custom-timingFunc`
data-jos_invoke	string	null	Set the function to be invoked when the element is scrolled into view.	`function`, `myCustomFunction`
data-jos_invoke_out	string	null	Set the function to be invoked when the element is scrolled out of view.	`function`, `myCustomFunction`
data-once	boolean & int	false	Set whether the element should animate only	`(boolean: true, false)` & `(int: 0-infinity)`
data-jos_rootMargin	string	0% -10% 0% -50%	Sets the margin for an element to animate on in a viewport when scrolled.	`(string: "right% top% left% bottom%")`
data-jos_rootMargin_top	string	0%	Sets the margin for an element to animate on the top of a viewport when scrolled.	`(string: "top%")`
data-jos_rootMargin_bottom	string	0%	Sets the margin for an element to animate on the bottom of a viewport when scrolled.	`(string: "bottom%")`
data-jos_scrollDirection	string	down	Sets the direction for an element to animate on ina viewport when scrolled.	`(string: "up", "down", "none")`
data-jos_startVisible	boolean & int	false	Set whether the element should start at the final state when the page is loaded (also works with delay).	`(boolean: true, false)` & `(int: 0-10000 ms)`
data-jos_anchor	string	null	Sets the anchor element for an element to animate on in a viewport when scrolled.	`(string: "#elementID")`
data-jos_scroll	string	null	Sets the callback function for an element to animate on in a viewport when scrolled.	`function`, `your_callbackFunction`
data-jos_stagger	string	fade	Sets the stagger animation for an child stagger element to animate on in a viewport when scrolled.	`string`, `fade`
data-jos_staggerinverse	string	static	Sets the stagger inverse animation for an child stagger element to animate on in a viewport when scrolled (play animation).	`string`, `fade-play`
data-jos_stagger_anchor	string	null	Sets the anchor element for an child stagger element to animate on in a viewport when scrolled.	`string`, `#elementID`
data-jos_stagger_seq	float	null	Sets the sequence delay for an child stagger element to animate on in a viewport when scrolled.	`float`, `0-1`
data-jos_stagger_delay	float	null	Sets the delay for an child stagger element to animate on in a viewport when scrolled.	`float`, `0-1`
data-jos_stagger_duration	float	null	Sets the duration for an element to child stagger animate on in a viewport when scrolled.	`float`, `0-1`
data-jos_stagger_timing-function	string	null	Sets the timing function for an child stagger element to animate on in a viewport when scrolled.	`string`, `ease`
data-jos_stagger_mirror	boolean	null	Sets the mirror animation for an child stagger element to animate on in a viewport when scrolled.	`boolean`, `true`, `false`
data-jos_stagger_rootMargin	string	null	Sets the margin for an child stagger element to animate on in a viewport when scrolled.	`(string: "right% top% left% bottom%")`
data-jos_stagger_scrollDirection	string	null	Sets the direction for an child stagger element to animate on ina viewport when scrolled.	`(string: "up", "down", "none")`
data-jos_stagger_startVisible	boolean & int	null	Set whether the child stagger element should start at the final state when the page is loaded (also works with delay).	`(boolean: true, false)` & `(int: 0-10000 ms)`
data-jos_stagger_once	boolean	null	Set whether the element should animate only once or n count.	`true`, `false`, `int`
data-jos_stagger_scroll	string	null	Sets the callback function for an child stagger to animate on in a viewport when scrolled.	`function`, `your_callbackFunction`
data-jos_stagger_invoke	string	null	Set the function to be invoked when the child stagger element is scrolled into view.	`function`, `myCustomFunction`
data-jos_stagger_invoke_out	string	null	Set the function to be invoked when the child stagger element is scrolled out of view.	`function`, `myCustomFunction`

JOS Methods

Method	Description	Parameters
init()	Initialize/Reset JOS	options = `{}` (refer JOS.Init(options) )
refresh()	Refresh JOS	none
stop()	Stop/Pause JOS	state = (`0` - Stop at final state, `1` - Stop at initial state, `-1` - Pause at current state)
start()	Start/Resume JOS Service	state = (`0` - Normal/Full start, `-1` - Resume from current state)
destroy()	Destroy JOS Instance	state = (`0` - Destroy JOS instance excluding stylesheet, `1` - Full Destroy along with JOS-stylesheet)

Bundling JOS

Once you are done and have finished developing a version of JOS, you can bundle it using the following command from project root :

# JOS-Animation-Library
# |-dev
# |-dist
# |-bundler
#   |-config
#   |-export  <-- Check this folder for the output files
#     |-jos.css
#     |-jos.js
#     |...
#   |-original
#   |-bundle.sh  <-- Run this file to bundle JOS
# ...

# Change/Move to bundler directory
cd ./bundler

# Bundle the project
sh bundle.sh

# View the output files
ls ./export

Bugs and Issues

Moved to issues

Contributing

Fork it from main branch
Add your useful feature or fix a bug
Commit your changes
Create a pull request

Maybe even bundle it and test it out before sharing it with the world ;

License

JOS is licensed under the MIT License.

Used In

CIT Takshashila 23
JOS Demo
JOS Playground
CSC
Bitspace

(Ping Me If you have a demo)

Why use JOS ?

Performance, JOS has a implementation, different from others.
Easy to use, you can use it in your projects with very minimal effort.
JOS is lightweight (<2kb)
Customizable with own attributes and animation.
Open sourced and free to use

Provide feedback

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README.md

README.md

JOS : Animation Library

About This Project

Built With

Installation

Version Tags

Setup

Custom Animation

Custom Inverse Animation

Playable Animation

Custom Timing Function

Anchors to trigger animation

Direction Based Animation

Start Visible

Create Custom Function

Scroll Progress Callback

Staggering Animation

JOS Attributes

JOS Methods

Bundling JOS

Bugs and Issues

Contributing

License

Used In

Why use JOS ?

Credits

This project was solely developed by Jesvi Jonathan

Files

README.md

Latest commit

History

README.md

File metadata and controls

JOS : Animation Library

About This Project

Built With

Installation

Version Tags

Setup

Custom Animation

Custom Inverse Animation

Playable Animation

Custom Timing Function

Anchors to trigger animation

Direction Based Animation

Start Visible

Create Custom Function

Scroll Progress Callback

Staggering Animation

JOS Attributes

JOS Methods

Bundling JOS

Bugs and Issues

Contributing

License

Used In

Why use JOS ?

Credits

This project was solely developed by Jesvi Jonathan