How to send data to child components in angular ,2024

in this blog, we will learn about how to send data to child components in angular

Solution 1: send the event to the child component angular

Source: stackoverflow.com


Parent-Component

eventsSubject: Subject<void> = new Subject<void>();

emitEventToChild() {
  this.eventsSubject.next();
}


Parent-HTML

<child [events]="eventsSubject.asObservable()"> </child>


Child-Component

private eventsSubscription: Subscription;

@Input() events: Observable<void>;

ngOnInit(){
  this.eventsSubscription = this.events.subscribe(() => doSomething());
}

ngOnDestroy() {
  this.eventsSubscription.unsubscribe();
}

Solution 2: angular passing data to child component

Source: angular.io

Parent component:
<app-child-component [item]="data"></app-child-component>

Child component.ts
import { Component, Input } from '@angular/core'; // First, import Input
export class ItemDetailComponent {
  @Input() item = ''; // decorate the property with @Input()
}

Solution 3: parent to child data pass in angular

//app.html:
<h1>this is perent component</h1>
<app-child [items]="employee"></app-child>
//app.component.ts:
 employee = {
    id: 1,
    name: 'chintan',
    address: 'junagadh',
  };
//child.component.ts:
@Input() items: any;
//child.html:
<h2>{{ items.id }}</h2>
<h2>{{ items.name }}</h2>
<h2>{{ items.address }}</h2>

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