VueJs 3 – Custom Input Component

I’m trying to build a custom HTML <input> component for VueJS3. I’ve been following this tutorial:

https://dev.to/viniciuskneves/vue-custom-input-bk8

So far I managed to get the CustomInput.vue component to work and emit the modified value back to the parent App.Vue.

<template>
<label>
{{ label }}
<input type="text" :name="name" :value="value" @input="onInput" @change="onChange" />
  </label>
</template>

<script>
export default {
  name: 'CustomInput',
      props: {
    label: {
      type: String,
      required: true,
    },
    value: {
      type: String,
      required: true,
    },
  },
  computed: {
    name() {
      return this.label.toLowerCase();
    },
  },
  methods: {
    onInput(event) {
      this.$emit('input', event.target.value);
    },
    onChange(event) {
      this.$emit('change', event.target.value);
    },
  },
}
</script>

What I don’t understand is – how will the emitted events be detected by the parent App.vue component? I can’t see it happens, and I can’t find it in the tutorial.

My App.Vue looks like this:

<template>
<custom-input :label="'Name'" :value="name"></custom-input>
<div>{{ name }}</div>
</template>

<script>
import customInput from "./components/CustomInput.vue";

export default {
  components: { customInput },
  name: "App",
  data: function () {
return {
  name: "",
};
  },
  mounted() {
    this.name = "Thomas";
  },
};
</script>

Thanks in advance for any help 🙂

Answer

This tutorial is for Vue 2 – for Vue 3 there is another tutorial (https://www.webmound.com/use-v-model-custom-components-vue-3/)

Emitting input event works in Vue 2 only – for Vue 3 you will have to emit update:modelValue and also use modelValue as a prop instead of just value.