Transition function in Vue3: implement animated transition of components

The transition function in Vue3: Implementing animated transitions of components

Vue3 is one of the most popular JavaScript frameworks currently. It provides comprehensive tools to solve the construction problems of front-end applications. Among them, the transition function is one of the very powerful and useful functions, which can help us realize the animated transition of components. In this article, we will introduce the transition function in detail and explain how to use it in Vue3 applications.

The role of transition function

In Vue2, we usually use the component to implement the animation transition of components. But in Vue3, we can use the transition function to replace the component. The role of the transition function is to provide an animated transition effect for the component.

The transition function has the following important parameters:

• name: used to set the name of the transition effect.
• appear: Indicates whether the transition effect needs to appear when the component is rendered for the first time.
• mode: Represents the mode of transition animation. There are three modes to choose from: in-out, out-in, and the default out.
• onBeforeEnter, onEnter, onAfterEnter, onBeforeLeave, onLeave, onAfterLeave: Represents the callback function triggered when the component enters or leaves the transition state.

Steps to use the transition function

Let’s take a look at how to use the transition function in a Vue3 application:

Step 1: In the template of the Vue component Set the transition function in.

<template>
  <div>
    <transition name="fade" @enter="enter" @after-enter="afterEnter">
      // your component here
    </transition>
  </div>
</template>

In this example, we set up a transition function named "fade" and used @enter and @after-enter event listeners to trigger the enter and afterEnter functions. The enter and afterEnter functions will be triggered when the component enters the animation and after the animation ends.

Step 2: Define the callback function of the transition function in the Vue component.

<script>
import { defineComponent } from 'vue';

export default defineComponent({
  methods: {
    enter(el, done) {
      // el 表示要执行动画的元素。
      // done 是一个在动画过渡结束时调用的函数。
      // 动画执行完毕后必须调用 done 函数，否则动画可能会被卡死。
      el.style.opacity = 0;
      setTimeout(() => {
        el.style.transitionDuration = '0.5s';
        el.style.opacity = 1;
      });
      setTimeout(done, 1000);
    },
    afterEnter(el) {
      // 动画完成后调用的函数，可以在这里做一些清理工作。
      el.style.removeProperty('opacity');
    },
  },
});
</script>

In this example, we define the enter and afterEnter functions. The enter function is used to set the initial state of the element and perform the animation transition effect of the element. The afterEnter function is used to clean up after the animation transition ends.

Summary

In this article, we introduced the transition function in Vue3 in detail. We see that by using the transition function, we can easily achieve the animated transition effect of the component. At the same time, we also learned that the transition function has many parameters and callback functions, which can be set according to our own needs. I hope that through the introduction of this article, readers can further understand the transition function in Vue3 and use it flexibly in the development of Vue3 applications.

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