Displaying a message when there are no results in Vue.js using transition-group and encountering the error message "children must be keyed

Utilizing vue.js, I crafted a small data filter tool that boasts sleek transitions for added flair. However, I encountered an issue with displaying a message when there are no results matching the current filters. Here's what I attempted:

<transition-group …>

  <div class="SOME_CLASSES" v-for="x in RESULTS" :key="x.id">…</div>

  <div class="OTHER_CLASSES" v-if="!RESULTS">Sorry, no results.</div>

</transition-group>

Unfortunately, this setup is not functioning as expected and generates a warning:

[Vue warn]: children must be keyed:

I pondered moving the message outside the <transition-group>:

<transition-group …>

  <div class="SOME_CLASSES" v-for="x in RESULTS" :key="x.id">…</div>

</transition-group>

<div class="OTHER_CLASSES" v-if="!RESULTS">Sorry, no results.</div>

However, this approach sacrifices the attractive animation that accompanies the display of the message.

Is there a clean solution for presenting the "empty results" message with a transition?
(Resorting to a hacky workaround involves adding a dummy entry to the RESULTS data and checking for it throughout.)

javascriptvue.jsvuejs2vue-component

Answer №1

To properly display the message "Sorry, no results." within an element, you need to wrap it with a transition group that has the same name as the transition group. Here's how you can achieve this:

Vue.config.devtools = false;
Vue.config.productionTip = false;


new Vue({
  el: '#list-demo',
  data: {
    items: [1, 2, 3, 4, 5, 6, 7, 8, 9],
    nextNum: 10
  },
  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)
    },
  }
})
.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);
}
<link type="text/css" rel="stylesheet" href="//unpkg.com/bootstrap/dist/css/bootstrap.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.js"></script>
<div id="list-demo">
  <button class="btn btn-primary" v-on:click="add">Add</button>
  <button class="btn btn-primary" 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>

  <transition name="list">
    <div class="OTHER_CLASSES" v-if="items.length==0">Sorry, no results.</div>
  </transition>
</div>

Answer №2

To achieve smooth transitions for lists, use the <transition-group> element instead of <transition>. Refer to this guide on transitions for single elements.

Make sure to retain the name attribute in the <transition-group> element to maintain consistent animations.

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