Changing rotation speed of a DIV not working in IE 11, using JS to update CSS animation properties

Question

I\'m trying to change the rotation speed of a DIV using simple buttons. It works in Chrome, but not IE. Is this a limitation of IE?

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Answer 1

You have to remove and re-add the animation to get it to pick up the changes.

After changing the speed, change the animation-name to a something else, then in a setTimeout, set animation-name back. It's a bit of a hack, but it does the trick.

var speed = 3;
document.getElementById("speedText").innerHTML = speed + "s";

function changeSpeed(change) {
  speed = speed + change;
  document.getElementById("speedText").innerHTML = speed + "s";
  document.getElementById("rotationDiv").style.animationDuration = speed + "s";
  document.getElementById("rotationDiv").style.animationName = "x";
  setTimeout(function(){
    document.getElementById("rotationDiv").style.animationName = "";
  },0);
  $("#rotationDiv").load(location.href + " #rotationDiv");
}

#rotationDiv {
  width: 50px;
  height: 50px;
  margin-left: 10px;
  background-color: blue;
  animation-name: spin;
  animation-duration: 3s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="button1" onclick="changeSpeed(-1)">Speed Up</button>
<button id="button2" onclick="changeSpeed(1)">Slow Down</button>
<p id="speedText"></p>
<div id="rotationDiv"></div>