Vue

by Roland Doda

HTML

<div id="list-demo">
  <button v-on:click="add">Add</button>
  <button v-on:click="remove">Remove</button>
  <transition-group name="list" tag="p">
    <span v-for="item in items" v-bind:key="item" class="list-item">
      {{ item }}
    </span>
  </transition-group>
</div>

CSS

.list-item {
  display: inline-block;
  margin-right: 10px; 
}
.list-enter-active, .list-leave-active {
  transition: all 1s;
}
.list-enter, .list-leave-to /* .list-leave-active below version 2.1.8 */ {
  opacity: 0;
  transform: translateY(30px);
}

Vue

new Vue({
  el: '#list-demo',
  data: {
    itemsInit: [1,2,3,4,5,6,7,8,9],
    nextNum: 10
  },
  computed: {
    items() {
      return [...this.itemsInit]
    }
  },
  methods: {
    randomIndex: function () {
      return Math.floor(Math.random() * this.items.length)
    },
    add: function () {
      this.items.splice(this.randomIndex(), 0, this.nextNum++)
    },
    remove: function () {
      this.items.splice(this.randomIndex(), 1)
    },
  }
})