How to pass data from parent to child component in Angular 4

Question

When I try to pass data from parent to child component. I\'m getting undefined message in the console. Data is in the form of array.

parent.component.html

Answer 1

It can be done using Input()decorator. See below code -

parent.component.ts -

import { Component } from '@angular/core';

@Component({
  selector: 'app-parent',
  template: `
    
  `,
  styleUrls: ['./parent.component.css']
})
export class ParentComponent{
  parentMessage = "message from parent"
  constructor() { }
}

child.component.ts -

import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-child',
  template: `
      Say {{ childMessage}}
  `,
  styleUrls: ['./child.component.css']
})
export class ChildComponent {

  @Input() childMessage: string;

  constructor() { }

}

More Information