The transitionProperty
property of the CSSTransition
interface returns the expanded transition property name of the transition. This is the longhand CSS property for which the transition was generated.
The transition in the following example changes the width of the box on hover. Calling Element.getAnimations()
returns an array of all Animation
objects. In our case this returns a CSSTransition
object, representing the animation created. The transitionProperty
property returns the property that the transition is created for, which is width
.
.box {
background-color: #165baa;
color: #fff;
width: 100px;
height: 100px;
transition: width 4s;
}
.box:hover {
width: 200px;
}
const item = document.querySelector(".box");
item.addEventListener('transitionrun', () => {
let animations = document.querySelector(".box").getAnimations();
console.log(animations[0].propertyName);
});