How Do You Detect When Css Animations Start And End With Javascript

CSS animations can add flair and interactivity to your web projects. However, sometimes you may need to know when these animations start and end to trigger other actions in your JavaScript code. Fear not! In this article, we will explore how you can detect the beginning and completion of CSS animations with JavaScript.

When it comes to detecting the start of a CSS animation, you can tap into the `animationstart` event. This event is triggered when a CSS animation starts on an element. You can listen for this event using JavaScript and perform any desired actions.

element.addEventListener('animationstart', () => {
  // Code to run when the animation starts
});

Similarly, to detect when a CSS animation ends, you can use the `animationend` event. This event is fired when a CSS animation completes on an element.

element.addEventListener('animationend', () => {
  // Code to run when the animation ends
});

To capture both the start and end of a CSS animation, you can combine the `animationstart` and `animationend` events. This allows you to execute different actions at the beginning and end of the animation.

element.addEventListener('animationstart', () => {
  // Code to run when the animation starts
});

element.addEventListener('animationend', () => {
  // Code to run when the animation ends
});

In some cases, you may want to know when a CSS animation is repeated. You can leverage the `animationiteration` event for this purpose. This event is triggered each time a CSS animation completes a cycle.

element.addEventListener('animationiteration', () => {
  // Code to run on each animation iteration
});

It's worth noting that the `animationstart`, `animationend`, and `animationiteration` events are specific to CSS animations. If you are working with CSS transitions instead, you can use `transitionstart` and `transitionend` events to detect the start and end of transitions respectively.

By utilizing these events in your JavaScript code, you can create dynamic and responsive web experiences that respond to CSS animations effortlessly.

In conclusion, detecting the start and end of CSS animations with JavaScript is crucial for enhancing user interactions on your website. By leveraging event listeners such as `animationstart` and `animationend`, you can synchronize your JavaScript actions with CSS animations seamlessly. Experiment with these events in your projects to add a touch of interactivity and finesse to your web applications. Happy coding!