Emitted Events

In Vue, emitted events are a way for a child component to communicate with its parent component. The child component emits an event, which the parent component can listen for and respond to. This allows for a unidirectional flow of data between the parent and child components.

Emit Method (Child)

To emit an event in a child component, you can use the $emit method. The first argument of the $emit method is the name of the event, and any additional arguments (optional) will be passed as payloads to the event. For example:

<template>  <button @click="$emit('my-event', 'some data')">Emit event</button></template>

This will emit an event called "my-event" when the button is clicked, passing the string "some data" as a payload.

Listening for Events (Parent)

To listen for an emitted event in a parent component, you can use the v-on directive. The first argument of the v-on directive is the name of the event, and the second argument is a callback function that will be called when the event is emitted. For example:

<template>  <child-component v-on:my-event="handleEvent"></child-component></template><script>export default {  methods: {    handleEvent(payload) {      console.log(payload)    }  }}</script>

In this example, the parent component is listening for the "my-event" event emitted by the child component and when the event is emitted, the handleEvent function is called, and the payload passed by the child component is logged to the console.

Passing Arguments

You can also pass arguments to the emitted event by using the $event variable. For example:

<template>  <button @click="$emit('my-event', $event)">Emit event</button></template>

Event Modifiers

You can also use event modifiers with emitted events, just like you can with native DOM events. For example, you can use the .prevent and .stop modifiers to prevent the default behavior of the event or stop it from propagating to parent components.

<template>  <button @click.prevent="$emit('my-event')">Emit event</button></template>

Emitted events are a powerful way to communicate between components in a Vue application, and they allow for a more modular and reusable structure. It's important to keep in mind that emitted events should be used to communicate between components, while props should be used to pass data down from a parent component to its child components.