Vue.js：我如何专注于刚刚未隐藏的输入

Question

This must be something really basic, but I can't get it.

I have this piece of code in my <template> :

<div v-if="this.editable">
    <input type="text" ref="nota" :id="notaid" v-model="nombre" v-on:keyup.enter="enviar" v-on:blur="enviar" class="form-control">
</div>
<div v-else>
    <p @click="makeEditable">{{ nombre }}</p>
</div>

So, when the page loads, editable=false so it displays a text. When you click in the text there's a function that will make editable true, so it displays the input. This works fine. Now, my problem is, how do I focus on the input as soon as editable changes to true?

I have read some articles: here , here , and some others that says I could be focusing on the element with some code as simple as:

this.$refs.nota.focus()

So makeEditable code is:

methods: {
  makeEditable() {
    this.editable = true;
    this.$refs.nota.focus()
  },
  ...

Problem is, I get this error:

app.js:38487 [Vue warn]: Error in v-on handler: "TypeError: Cannot read property 'focus' of undefined"

I'm pretty sure this is because I'm trying to focus to an element that hasn't been created yet, because if I make the same on an input element that is always displayed, it works perfectly.

So which is the right way?

Answer 1

You can try Vue.nextTick(callback) as follow:

methods: {
  makeEditable() {
    this.editable = true;
    Vue.nextTick(() => 
      this.$refs.nota.focus()
    )
  },
  ...

It tells Vue to wait until the changes are made and then call the callback.
See the documentation for more .