@Input da @Output su ne hanyar standard wacce kwamandona da yara abubuwan halitawa suke tattaru da juna: yana watsa bayanan (parent → child), kuma yana aika abubuwan tarihi (child → parent). Wannan yana nuna duniya gaba daya "props kasa, abubuwan tarihi sama" tsari.
@Input@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>
Yara yana tuɓa ta EventEmitter; magaji yana ɗauka shi da (eventName) kuma yana karɓar alwali a matsayin $event. Yara ba ta canja bayanan magaji kai tsaye — yana nema aikin ta watsewa.
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 na karkace yana ƙara sigina-tushe input()/output() aiki a matsayin wata hanya.
@Input/@Output su ne jita-jita na sadarwar magaji da yara kuma abubuwan amsuwi da aka buɗe a Angular — suna tilasta hanyar bayanan daya (kasa ta haɗe, sama ta abubuwan tarihi) wacce ke kiyaye bayanan da abubuwan suke cike kuma abubuwan halitawa ba su ɗaure.
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