Is there a way to detect when an animation reaches a specific keyframe, like 50% or 75%?
I attempted the following:
element.addEventListener("animationend", AnimationListener, false);
However, this only supports animationstart, animationiteration, and animationend events.
Exploring the provided Fiddle example, the main goal is to determine when the #sun element's bottom property reaches a value of 100px. This can be achieved by utilizing getComputedStyle() to monitor the value, stopping the interval once it equals 100px, and then executing customized code:
var style=window.getComputedStyle(document.getElementById("sun")),
interval=setInterval(function(){
if(parseInt(style.getPropertyValue("bottom"))===100){
clearInterval(interval);
console.log("50% reached");
}
},1);#sun{
animation:sunrise 1s ease;
bottom:0;
background:#ff0;
border-radius:50%;
height:50px;
position:absolute;
width:50px;
}
@keyframes sunrise{
0%{
bottom:0;
left:0;
}
50%{
bottom:100px;
}
100%{
bottom:0;
left:400px;
}
}<div id="sun"></div>If you need to track multiple values, simply set up another interval. In this scenario, as per the example provided, when the animation hits 75%, the bottom property should ideally be at 50px. Due to potential variations across browsers, consider checking for values less than or equal to 50 instead:
var style=window.getComputedStyle(document.getElementById("sun")),
interval=setInterval(function(){
if(parseInt(style.getPropertyValue("bottom"))===100){
clearInterval(interval);
console.log("50% reached");
interval=setInterval(function(){
if(parseInt(style.getPropertyValue("bottom"))<=50){
clearInterval(interval);
console.log("75% reached");
}
},1);
}
},1);#sun{
animation:sunrise 1s ease;
bottom:0;
background:#ff0;
border-radius:50%;
height:50px;
position:absolute;
width:50px;
}
@keyframes sunrise{
0%{
bottom:0;
left:0;
}
50%{
bottom:100px;
}
100%{
bottom:0;
left:400px;
}
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