Invalid input
Written byPhuoc Nguyen
Created
30 Sep, 2022
The animation is often used to indicate an invalid input. It shakes the input for a while.
Press the Enter key to see the effect
The shaking animation moves the element to the left and right sides. It can be done by using the
`translateX` function:css
@keyframes shake {
from,
to {
transform: translateX(0);
}
40%,
80% {
transform: translateX(-1rem);
}
20%,
60% {
transform: translateX(1rem);
}
}To use the animation, we can add a simple
`animation` style:css
.input--invalid {
animation: shake 1s;
outline-color: #ef4444;
}Let's assume that
`inputEle` represents the input element. You can add the invalid CSS class created above anytime to indicate the input is invalid:js
inputEle.classList.add('input--invalid');#Remove the animation
If you want to remove the invalid state from the element when the animation completes, you can handle the
`animationend` event:js
inputEle.addEventListener('animationend', (e) => {
if (e.animationName === 'shake') {
inputEle.classList.remove('input--invalid');
}
});Inside the event handler, you can use the
`animationName` property to check which animation is completed. It's very useful in the case the element runs more than one animation at the same time.
Questions? 🙋
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Phước Nguyễn