Looking for a method to determine if a CSS3 animation with a specific name is present, without the need to loop through all CSS rules. Any solution using either a JS library or plain JS will suffice.
Looking for a method to determine if a CSS3 animation with a specific name is present, without the need to loop through all CSS rules. Any solution using either a JS library or plain JS will suffice.
One possible solution is to:
animationstart event to this dummy element..style.animationName (with appropriate vendor-prefix).If the event does not trigger, it can be assumed that the animation does not exist. Remember to clean up by removing the element from the DOM.
This method operates asynchronously by design. It proves to be more dependable than scanning through all style sheets as the latter approach fails when an animation is specified in a style sheet from a different source.
function checkIfAnimationExists(animationName, callback) {
var dummy = document.createElement('dummy');
var done = function(result) {
if (dummy.parentNode) {
dummy.parentNode.removeChild(dummy);
callback(result);
}
};
var onanimstart = function() {
done(true);
};
// Animations only fire when the tab is visible:
var requestAnimationFrame = window.requestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame;
requestAnimationFrame(function() {
done(false);
});
if (typeof dummy.style.animationName != 'undefined') {
dummy.style.animationName = animationName;
dummy.style.animationDuration = '0.001s';
dummy.addEventListener('animationstart', onanimstart);
} else {
dummy.style.webkitAnimationName = animationName;
dummy.style.webkitAnimationDuration = '0.001s';
dummy.addEventListener('webkitAnimationStart', onanimstart);
}
(document.body || document.documentElement).appendChild(dummy);
}
The aforementioned function accurately detects whether an animation exists in browsers such as:
moz-prefixed branch).Live demonstration: http://jsfiddle.net/7mjSd/ (displays two alert boxes).
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