How to trigger or pause a CSS animation in Javascript

February 3, 2021 admin

To trigger or pause a CSS animation in Javascript. You can use the animationPlayState property of the HTML DOM style to specify whether an animation is running or paused.

Syntax :

animation-play-state: running|paused|initial|inherit;

running: This value is used to run / play an animation.
paused: This value is used to pause an animation.
initial: This value sets the animation-play-state property to the parent element value.
inherit: This value is used to set the .animation-play-state property to default (running).

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HTML Code:

<!DOCTYPE html>
<html>
  <head>
    <title>Trigger or pause a CSS animation in Javascript</title>
    <style>
      /* Put the css code here. */
    </style>
  </head>

  <body>
    <div class="display-anim"></div>
    <button type="button" id="play_stop">Trigger/Pause</button>
  </body>

  <script type="text/javascript">
    // Put the javascript code here.
  </script>
</html>

Javascript Code:

    var anim = document.querySelectorAll('.display-anim');

    document.getElementById('play_stop').onclick = function () {
        for (var i = 0; i < anim.length; i++) {
            if (anim[i].style.animationPlayState == 'paused') {
                anim[i].style.animationPlayState = 'running';
            }
            else {
                anim[i].style.animationPlayState = 'paused';
            }
        }
    }

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CSS Code:

.display-anim {
    height: 250px;
    margin: 12px 0;
    background: url("https://1.bp.blogspot.com/-SEBMg2X0IqM/XRyfgTMBBkI/AAAAAAAAFEE/_xBgKj-gxtY1MybpCBCmDIUL-_Jtjl6FQCLcBGAs/s320/car.png") no-repeat left center #57A6F6;
    -webkit-animation: test 4s infinite;
    animation: test 4s infinite;
}

@-webkit-keyframes test {
    50% {
        background-position: right center;
    }
}

@keyframes test {
    50% {
        background-position: right center;
    }
}