How to keep CSS3 animation end state unchanged

introduction

CSS3 animation brings rich dynamic effects to web design, making the page more vivid and attractive. However, sometimes we want the animation to remain in its final state when it ends, rather than returning to its initial state. This article will introduce several ways to achieve this effect and ensure that the animation maintains this state at the end of the action.

Method 1: Use animation-fill-mode attribute

The animation-fill-mode property is used to control the style of animation before and after playing. By setting this property, you can achieve the effect of maintaining the final state when the animation ends.

attribute value

Example

 .element {
  animation: myAnimation 2s ease-in-out;
  animation-fill-mode: forwards;
}
@keyframes myAnimation {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(100px);
  }
}

In this example, the .element element will remain in transform: translateX(100px) state after the animation ends.

Method 2: Use animationend event

By listening to animationend event through JavaScript, you can manually set the style of the element when the animation ends, thereby maintaining the animation end state.

Example

 <div class="element"></div>

 .element {
  width: 100px;
  height: 100px;
  background-color: red;
  animation: myAnimation 2s ease-in-out;
}
@keyframes myAnimation {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(100px);
  }
}

 const element = document.querySelector('.element');
element.addEventListener('animationend', () => {
  element.style.transform = 'translateX(100px)';
});

In this example, when the animation ends, the JavaScript code sets the element's transform property to translateX(100px) , thus maintaining the animation's end state.

Method 3: Use the transition attribute

Although the transition property is mainly used for transition effects, by using it cleverly, you can also achieve the effect of maintaining the final state when the animation ends.

Example

 <div class="element"></div>

 .element {
  width: 100px;
  height: 100px;
  background-color: red;
  transition: transform 2s ease-in-out;
}
.element.animate {
  transform: translateX(100px);
}

 const element = document.querySelector('.element');
element.classList.add('animate');

In this example, by adding the animate class, the element's transform property transitions from its initial state to translateX(100px) and remains in that state after the transition ends.

Summarize

Keeping the end state of a CSS3 animation unchanged can be achieved in a variety of ways, including using animation-fill-mode property, listening to animationend event, and using the transition property. Each method has its applicable scenarios, and developers can choose the appropriate method according to specific needs.

I hope this article can provide you with a clear understanding and practical guidance to help you better apply CSS3 animation in actual development and achieve the required dynamic effects.

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