Animating Vue 3 Components with the Transition Component

<template>
  <div>
    <button @click="showBox = !showBox">Toggle Box</button>

    <Transition name="fade-slide">
      <div v-if="showBox" class="animated-box">
        Hello, Vue 3 Transitions!
      </div>
    </Transition>

    <button @click="showList = !showList">Toggle List</button>
    <TransitionGroup name="list" tag="ul">
      <li v-for="item in items" :key="item.id" class="list-item">
        {{ item.text }}
      </li>
    </TransitionGroup>
  </div>
</template>

<script setup>
import { ref, reactive, computed } from 'vue';

const showBox = ref(false);
const showList = ref(true); // For TransitionGroup example

const initialItems = [
  { id: 1, text: 'Item 1' },
  { id: 2, text: 'Item 2' },
  { id: 3, text: 'Item 3' },
];
const allItems = reactive([...initialItems]);

const items = computed(() => showList.value ? allItems : []);

// Add/remove items for demonstration, e.g., via a button
// This example uses a computed property to simulate adding/removing items
</script>

<style>
/* Styles for the single element transition */
.fade-slide-enter-active,
.fade-slide-leave-active {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-slide-enter-from,
.fade-slide-leave-to {
  opacity: 0;
  transform: translateY(20px);
}

/* Styles for the list transition (TransitionGroup) */
.list-enter-active,
.list-leave-active {
  transition: all 0.5s ease;
}

.list-enter-from,
.list-leave-to {
  opacity: 0;
  transform: translateX(30px);
}

/* Ensures list items don't jump when one is removed */
.list-move {
  transition: transform 0.5s ease;
}

/* General styling for animated elements */
.animated-box {
  background-color: #42b983;
  color: white;
  padding: 20px;
  margin-top: 20px;
  border-radius: 8px;
  width: 200px;
  text-align: center;
}

.list-item {
  background-color: #35495e;
  color: white;
  padding: 10px;
  margin-bottom: 5px;
  border-radius: 4px;
}
</style>