Check when the animation is finished

onAnimationEnd.js

// https://davidwalsh.name/css-animation-callback
/* From Modernizr */
function whichAnimationEvent() {
    var t;
    var el = document.createElement('fakeelement');
    var animations = {
        'animation': 'animationend',
        'WebkitAnimation': 'webkitTransitionEnd'
    }

    // 'animationend'
    // 'oanimationend'
    // 'webkitAnimationEnd'
    // 'MSAnimationEnd'

    for (t in animations) {
        if (el.style[t] !== undefined) {
            return animations[t];
        }
    }
}

var animationEvent = whichAnimationEvent();


const
    onAnimationEnd = function (el, fn) {
        animationEvent && el.addEventListener(animationEvent, function() {
            fn();
        });
    };

export default onAnimationEnd;