this.$refs[(“p” + index)].focus is not a function

问题

I'd like to turn a div into input box on click, so that the post (which is rendered inside a loop) can be edited.

Here is the button on the post:

<a @click="setFocusEdit(index)" v-if="isAuthor(post)" href="#" >Edit Me</a>

And the div concerned:

<div :ref="'p' + index"  class="post-description">
    {{post.description}}
</div>

The method:

  setFocusEdit(index) {
    console.log('focusing on', index);

    this.$refs['p' + index].focus();
  },

But I get this error:

Uncaught TypeError: this.$refs[("p" + index)].focus is not a function

How can I fix this?

回答1:

After some debugging i found that this.$refs['p' + index] returns always an array containing one item which is your element, this.$refs.p0 returns also an array, so to deal with that try to access the one element like this.$refs['p' + index][0]

new Vue({
  el: '#app',
  data: function() {
    return {
      posts: [{
          title: "post 1",
          content: "content 1"
        },
        {
          title: "post 2",
          content: "content 2"
        }
      ],

    }
  },

  methods: {
    setFocusEdit(index) {


      this.$refs['p' + index][0].focus();
    }

  },
  mounted() {

  }

})

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>




<div id="app">
  <div class='col-md-4 mt-3' v-for="(post, index) in posts" :key="index">
    <textarea readonly :ref="'p' + index" class="post-description">
      {{post.content}}
    </textarea>
    <a @click.prevent="setFocusEdit(index)" href="#">Edit Me</a>
  </div>
</div>

来源：https://stackoverflow.com/questions/54306581/this-refsp-index-focus-is-not-a-function