<template>
  <h1>Add/Remove &lt;p&gt; Tag</h1>
  <p>The second transition in this example has the name prop "swirl", so that we can keep the transitions apart with different class names.</p>
  <hr>
  <button @click="this.p1Exists = !this.p1Exists">{{btn1Text}}</button><br>
  <Transition>
    <p v-if="p1Exists" id="p1">Hello World!</p>
  </Transition>
  <hr>
  <button @click="this.p2Exists = !this.p2Exists">{{btn2Text}}</button><br>
  <Transition name="swirl">
    <p v-if="p2Exists" id="p2">Hello World!</p>
  </Transition>
</template>

<script>
export default {
  data() {
    return {
      p1Exists: false,
      p2Exists: false
    }
  },
  computed: {
    btn1Text() {
      if(this.p1Exists) {
        return 'Remove';
      }
      else {
        return 'Add';
      }
    },
    btn2Text() {
      if(this.p2Exists) {
        return 'Remove';
      }
      else {
        return 'Add';
      }
    }
  }
}
</script>

<style>
  .v-enter-active {
    background-color: lightgreen;
    animation: added 1s;
  }
  .v-leave-active {
    background-color: lightcoral;
    animation: added 1s reverse;
  }
  @keyframes added {
    from {
      opacity: 0;
      translate: -100px 0;
    }
    to {
      opacity: 1;
      translate: 0 0;
    }
  }
  .swirl-enter-active {
    animation: swirlAdded 1s;
  }
  .swirl-leave-active {
    animation: swirlAdded 1s reverse;
  }
  @keyframes swirlAdded {
    from {
      opacity: 0;
      rotate: 0;
      scale: 0.1;
    }
    to {
      opacity: 1;
      rotate: 360deg;
      scale: 1;
    }
  }
  #p1, #p2 {
    display: inline-block;
    padding: 10px;
    border: dashed black 1px;
  }
  #p2 {
    background-color: lightcoral;
  }
</style>                  

import { createApp } from 'vue'

import App from './App.vue'

const app = createApp(App)
app.mount('#app')