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How do child components emit events to parents?

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01

Understand the problem

Explain @Output and EventEmitter.

outputeventemitter
02

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03

Study the solution

A child declares @Output() change = new EventEmitter<T>() and calls this.change.emit(value). The parent binds (change)="handler($event)". Modern Angular also offers the output() function as a signals-based alternative.

Solution ready — 2 min read

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04

Read the code

Child @Output → parent handler
import { Component, Output, EventEmitter, Input } from '@angular/core';

@Component({
  selector: 'app-likes',
  standalone: true,
  template: '<button (click)="like()">👍 {{ count }}</button>',
})
export class LikesComponent {
  @Input() count = 0;
  @Output() liked = new EventEmitter<number>();   // event channel up
  like() { this.liked.emit(++this.count); }
}

// Parent:  <app-likes [count]="0" (liked)="onLiked($event)"></app-likes>
05

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