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Detect css animation using Javascript

A Pen By Aamir Afridi

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HTML

            
              <div>Click me</div>
<a href='#'>Hover over here to pause the animation</a>
!

CSS

            
              div{
  background: green;
  height: 59px;
  width: 100px;
  color: white;
  text-align: center;
  padding-top: 38px;
}

a {
  display: block;
  background: gray;
  float: left;
  margin-top: 5px;
  color: white;
  text-decoration: none;
  padding: 5px 7px;
}
!

JS

            
              function supportsAnimations() {
    var b = document.body || document.documentElement,
        s = b.style,
        p = 'animation',
        animationId = 'myAnimation-' + Math.floor(Math.random() * 10000000),
        playState = 'animation-play-state',
        v = ['Moz', 'Webkit', 'O', 'ms'];

    if (typeof s[p] == 'string') {
        return {
            id: animationId,
            prefix: prefix,
            animationProperty: p,
            playState: playState,
            keyframeString: '@keyframes ' + animationId + ' '
        }
    }

    for (var i = 0; i < v.length; i++) {
        if (s[v[i] + 'Animation'] !== undefined) {
            var prefix = '-' + v[i].toLowerCase() + '-';
            return {
                id: animationId,
                prefix: prefix,
                animationProperty: prefix + 'animation',
                playState: prefix + playState,
                keyframeString: '@' + prefix + 'keyframes ' + animationId + ' '
            };
            break;
        }
    }
    return false;
}

function addKeyFrameStyle(keyframeCss) {
    var $styles = $('style');
    if ($styles.length != 0) {
        $styles.last().append(keyframeCss)
    } else {
        $('head').append('<style>' + keyframeCss + '</style>');
    }
}

function animate(duration, marginLeft, loop) {
    var css3support = supportsAnimations(),
        hoverLinkElm = document.getElementsByTagName("a")[0],
        elm = this;
    //Animation loop str for CSS3
    loop = loop ? 'infinite' : '';
    //if(false) { //To test jQuery fallback, uncomment this line and comment out next line
    if (css3support) {
        //change duration to seconds
        duration = duration / 1000;
        //If loop is infinite than slow down the animation by multiplying duration with 2
        if (loop != '') duration = duration * 2;
        elm.style[css3support.animationProperty] = css3support.id + ' ' + duration + 's ' + loop + ' linear';
        //Add the CSS rules to the head
        addKeyFrameStyle(css3support.keyframeString + '{ 50% { margin-left:' + marginLeft + '}}'); //50% { margin-left:0 }  }');
        //handle mouse over to pause - You can do that just with CSS but this is just an example how can pause or play using JS.
        hoverLinkElm.onmouseover = function () {
            elm.style[css3support.playState] = 'paused';
        }
        hoverLinkElm.onmouseout = function () {
            elm.style[css3support.playState] = 'running';
        }
    }
}

//animate the element
document.getElementsByTagName("div")[0].onclick = function () {
    animate.apply(this, [2000, '390px', true]);
}
!
999px
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