CSS animation onclick and reverse next onclick - css

Question

I am using a spritesheet and keyframes to animate the image on a button when it is clicked.
When the button is clicked I want the frames to run in one direction and leave the button on the last image in the spritesheet, and when it is clicked again I want the same frames to run backwards, leaving the button on the first image on the spritesheet.
I am currently trying to use jquery to change the class on the button to an animating class when it is clicked, but this doesn't seem to be working.
fiddle: http://jsfiddle.net/CGmCe/10295/
JS:
function animate(){
$('.hi').addClass('animate-hi');
}
CSS:
.hi {
width: 50px;
height: 72px;
background-image: url("http://s.cdpn.io/79/sprite-steps.png");
}
.animate-hi {
animation: play 2s steps(10);
}
#keyframes play {
from { background-position: 0px; }
to { background-position: -500px; }
}

Answer 1

Make sure you are using an animation-capable browser. For me this works in Firefox.
The following might be just what you wanted:
http://jsfiddle.net/CGmCe/10299/
Code:
function animateButton() {
var button = $('.hi');
if (button.hasClass('animate-hi')) {
button.removeClass('animate-hi').addClass('animate-hi-reverse');
} else if (button.hasClass('animate-hi-reverse')) {
button.removeClass('animate-hi-reverse').addClass('animate-hi');
} else {
button.addClass('animate-hi');
}
};
$(document).ready(function() {
$('.hi').on("click", function() {
animateButton();
});
});
.hi {
width: 50px;
height: 72px;
background-image: url("http://s.cdpn.io/79/sprite-steps.png");
}
.animate-hi {
animation: play 2s steps(10);
}
.animate-hi-reverse {
animation: play-reverse 2s steps(10);
}
#keyframes play {
from {
background-position: 0px;
}
to {
background-position: -500px;
}
}
#keyframes play-reverse {
from {
background-position: -500px;
}
to {
background-position: 0px;
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<img src="http://s.cdpn.io/79/sprite-steps.png" />
<button class="hi" type="button"></button>

Answer 2

Make a counter variable which checks if the button is clicked or not.
And based on the counter value add class to the element for example:
var counter=0;
$('.btn').on('click',function(){
if(counter=0)
{
$('.hi').addClass('animate-hi');
counter = 1;
}
else
{
counter = 0;
$('.hi').removeClass('animate-hi');
}
});
Make sure to declare the counter variable outside the function. Else every time its value initialized to 0.