ViewChild & ViewChildren

// child.component.ts
export class ChildComponent {
  message = 'Hello from Child!';
  
  showAlert() {
    alert('Child method called!');
  }
}

// parent.component.ts
import { Component, ViewChild, AfterViewInit } from '@angular/core';

@Component({
  selector: 'app-parent',
  template: `
    <app-child></app-child>
    <button (click)="callChildMethod()">Call Child</button>
  `
})
export class ParentComponent implements AfterViewInit {
  @ViewChild(ChildComponent) child!: ChildComponent;
  
  ngAfterViewInit() {
    console.log(this.child.message);
  }
  
  callChildMethod() {
    this.child.showAlert();
  }
}