animate.css/docsSource/sections/04-javascript.md
2020-06-19 16:11:26 +01:00

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## Usage with Javascript
You can do a whole bunch of other stuff with animate.css when you combine it with Javascript. A simple example:
```javascript
const element = document.querySelector('.my-element');
element.classList.add('animate__animated', 'animate__bounceOutLeft');
```
You can detect when an animation ends:
```javascript
const element = document.querySelector('.my-element');
element.classList.add('animate__animated', 'animate__bounceOutLeft');
element.addEventListener('animationend', () => {
// do something
});
```
or change its duration:
```javascript
const element = document.querySelector('.my-element');
element.style.setProperty('--animate-duration', '0.5s');
```
You can also use a simple function to add the animations classes and remove them automatically:
```javascript
const animateCSS = (element, animation, prefix = 'animate__') =>
// We create a Promise and return it
new Promise((resolve, reject) => {
const animationName = `${prefix}${animation}`;
const node = document.querySelector(element);
node.classList.add(`${prefix}animated`, animationName);
// When the animation ends, we clean the classes and resolve the Promise
function handleAnimationEnd() {
node.classList.remove(`${prefix}animated`, animationName);
node.removeEventListener('animationend', handleAnimationEnd);
resolve('Animation ended');
}
node.addEventListener('animationend', handleAnimationEnd);
});
```
And use it like this:
```javascript
animateCSS('.my-element', 'bounce');
// or
animateCSS('.my-element', 'bounce').then((message) => {
// Do something after the animation
});
```
If you had a hard time understanding the previous function, have a look at [const](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const), [classList](https://developer.mozilla.org/en-US/docs/Web/API/Element/classList), [arrow functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions), and [Promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).