Can You Control GIF Animation With Javascript?


Answer :

You can use the libgif library.

It allows you to start/stop the gif and control which frame the gif is on.

<script type="text/javascript" src="./libgif.js"></script> <img src="./example1_preview.gif" rel:animated_src="./example1.gif"  width="360" height="360" rel:auto_play="1" rel:rubbable="1" />  <script type="text/javascript">     $$('img').each(function (img_tag) {         if (/.*\.gif/.test(img_tag.src)) {             var rub = new SuperGif({ gif: img_tag } );             rub.load(function(){                 console.log('oh hey, now the gif is loaded');             });         }     }); </script>

(most of the code is taken directly from their example)


I use x-gif it's pretty cool and easy to setup.

From Github:

<x-gif src="probably_cats.gif"></x-gif>

Where you can add the following as attributes:

  • Playback modes:
    • speed="1.0" (default mode) multiplies the speed by the value of the attribute;
    • sync defers playback to an external object;
    • bpm="120" syncs GIFs to a given beats-per-minute;

  • Options:

    • stopped prevents the GIF from animating;

    • fill causes the GIF to expand to cover its container;

    • n-times="3.0" (speed mode only) stops playback (by adding the attribute stopped) after a set number of times;
    • snap (sync & bpm modes only) instead of allowing longer GIFs to sync to multiple beats, force them to fit into only one;
    • ping-pong plays the GIF front-to-back then back-to-front;
  • Debugging:
    • debug turns on debug output from the Gif Exploder;
    • exploded stops playback, and renders each frame out side-by-side.

If you are OK with converting your gif to a sprite sheet, you can do it this way (using ImageMagick):

montage animation.gif -coalesce -tile x1 -geometry +0+0 -background None -quality 100 spritesheet.png

It is even likely that the new image will be of lesser size.

Once you have a sprite sheet, use CSS animation. An animation with a fixed frame time is used here:

var el = document.getElementById('anim'); function play() {   el.style.animationPlayState = 'running'; } function pause() {   el.style.animationPlayState = 'paused'; } function reset() {   el.style.animation = 'none';   el.offsetHeight; /* trigger reflow to apply the change immediately */   el.style.animation = null; } function stop() {   reset();   pause(); }
#anim {   background-image: url('https://i.stack.imgur.com/J5drY.png');   width: 250px;   height: 188px;   animation: anim 1.0s steps(10) infinite; } @keyframes anim {   100% { background-position: -2500px; } }
<div id="anim" title="Animated Bat by Calciumtrice"></div> <button onclick="play()">Play</button> <button onclick="pause()">Pause</button> <button onclick="reset()">Reset</button> <button onclick="stop()">Stop</button>

If you want the animation to not start automatically, add paused to the end of animation rule.


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