@Input lan @Output minangka cara standar ing mana komponen induk lan anak komunikasi: @Input mindhasake data (induk → anak), lan ngirim acara (anak → induk). Iki cerminan pola universal "props mudhun, acara mudhun".
@Output// child: UserCardComponent
import { Component, Input } from "@angular/core";
@Component({ selector: "app-user-card", template: `<h2>{{ user.name }}</h2>` })
export class UserCardComponent {
@Input() user!: User; // receives data from the parent
@Input() showEmail = false; // with a default
}
<!-- parent passes data via property binding -->
<app-user-card [user]="currentUser" [showEmail]="true"></app-user-card>
// child emits an event the parent can listen to
import { Component, Output, EventEmitter } from "@angular/core";
@Component({
selector: "app-user-card",
template: `<button (click)="onDelete()">Delete</button>`,
})
export class UserCardComponent {
@Output() deleted = new EventEmitter<number>(); // declares an output event
onDelete() {
this.deleted.emit(this.user.id); // emit with a payload
}
}
<!-- parent listens via event binding -->
<app-user-card [user]="u" (deleted)="removeUser($event)"></app-user-card>
Komponen anak emit liwat EventEmitter; komponen induk bind liwat (eventName) lan narima payload minangka $event. Komponen anak ora bisa ngganti data induk kanthi langsung — ono njaluk gerakan kanthi emit.
Parent ──[user]──────────────→ Child (@Input: data down)
Parent ←──(deleted)=removeUser─ Child (@Output: events up)
name = input<string>(); // signal-based @Input (newer Angular)
deleted = output<number>(); // signal-based @Output
Angular anyar nambah fungsi input()/output() adhedhasar signal minangka alternatif.
@Input/@Output minangka inti komunikasi induk-anak lan komponen sing bisa digunakake maneh ing Angular — padha ngaksesake aliran data sapusat-pusat (mudhun liwat input, mudhun liwat acara) sing njaga data bisa diprediksi lan komponen ora katergantungan.
Narti pasangan iki penting banget kanggo nyusun UI Angular sing ora gampang; kanggo komunikasi antarane komponen sing ora gegandhenan, sampean bisa nggunakake layanan bareng utawa perpustakaan negara.