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Between is a ES6 Proxy-based JavaScript animation library with API similar to Cocoa Animation block
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README.md

Between

Between is JavaScript animation library providing Cocoa-like Animation block.

It was made possible thanks to ES6-Proxy.
I started to wrote this library as a Proof of Concept for the default Animation library for nidium project

Block-Based Animations

Animations block are a way to express animations in a declarative way. They are used in the Apple cocoa framework

Examples

var square = document.getElementById("my_div").style;

// The code inside the block only run once.
// Here `square` in the original one wrapped by a Proxy
Between.block(1000, Between.easing.Bounce.Out, (square /* Proxy wrapped element */) => {
    /*
        This block define the "end values".
        Between will tween them from their initial values to the end values described here
    */

    /* Set the end value for top and width. */
    square.top = "0px";
    square.width = "150px";

    /*
        Add 200 to the initial left value.
        Here, it's the same than doing `square.left = "250px"`
    */
    square.left += 200;

}, square /* original element */);

Example 1

Swap the position of two elements. Just swap their left properties.

Between.block(3000, Between.easing.Elastic.Out, (square_one, square_two) => {

   // Swap the left of the two element using destructuring array.
   [square_one.left, square_two.left] = [square_two.left, square_one.left]

}, square_one, square_two); // Give any number of elements

Example 2

Online demos

Supported browsers

Between needs various ES6 features (Proxy, Spread syntax (rest parameters), arrow function) in order to work.
As of today, it seems to work on last release of major browsers and in the nidium project engine

Download

between.js

Usage

Include between.js in your page:

<script src="between.js"></script>

Animate any property (really anything as long as it's backed by a number)

Between.block(1000 /* duration in ms */, Between.easing.Bounce.Out /* Easing function */, (obj) => {
    // Animate anything in `obj`
}, obj);

Available Easing function :

Linear.None

Quadratic.In
Quadratic.Out
Quadratic.InOut

Cubic.In
Cubic.Out
Cubic.InOut

Quartic.In
Quartic.Out
Quartic.InOut

Quintic.In
Quintic.Out
Quintic.InOut

Sinusoidal.In
Sinusoidal.Out
Sinusoidal.InOut

Exponential.In
Exponential.Out
Exponential.InOut

Circular.In
Circular.Out
Circular.InOut

Elastic.In
Elastic.Out
Elastic.InOut

Back.In
Back.Out
Back.InOut

Bounce.In
Bounce.Out
Bounce.InOut

License

Copyright 2017 Anthony Catel. All rights reserved. Use of this source code is governed by a MIT license that can be found in the LICENSE file.

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