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Components can send data back to their parent by emitting events. This allows child components to communicate when something happens, such as a button click.

To emit an event, use defineEmits() inside the component.

<!-- ButtonComponent.vue -->
<script setup>
const emit = defineEmits(["clickEvent"]);

function handleClick() {
  emit("clickEvent");
}
</script>

<template>
  <button @click="handleClick">Click</button>
</template>

The component emits a custom event called "clickEvent".

In the parent component, you listen to this event.

<script setup>
import ButtonComponent from "./components/ButtonComponent.vue";

function handleEvent() {
  console.log("Event received");
}
</script>

<template>
  <ButtonComponent @clickEvent="handleEvent" />
</template>

When the button is clicked, the event is emitted and handled in the parent.

Emitting events allows components to communicate and keep logic organized.

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セクション 1. 章 12

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Emitting Events from Components