How do Components Communicate with Each Other in Angular 2?

In Angular 1, I have some ways to communicate between controllers i.e.

1.      $rootScope,

2.      $scope,

3.      $emit,

4.      $broadcast

Now In Angular 2, we have different ways to communicate between components.

A parent component and its children share a service whose interface enables bi-directional communication within the family.

Stayed Informed - Angular2 Components Life-cycle

The following examples for Services communication,

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

@Injectable()
export class MyService {
  constructor() { }
}

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

@Component({
  selector: 'my-app',
  templateUrl: './myApp.component.html'
})
export class MyAppComponent { }

The following example to calling service from any other component,

import {Component, OnInit} from '@angular/core';
import {MyService} from './app/myService'; 

@Component({
  selector: '<my-component></my-component>',
  templateUrl: 'app/component.html',
  providers: [MyService]
})

export class MyComponent implements OnInit {
  constructor(private msInstance: MyService) {}
  ngOnInit() { 
      this.msInstance.getServices(); 
  }
}

Example for Sibling Component Communication,

import { Component, ViewChild, AfterViewInit } from '@angular/core';
import { ListComponent } from './list.component';
import { DetailComponent } from './detail.component';

@Component({
  selector: 'app-component',
  template: '<list-component></list-component><detail-component></detail-component>',
  directives: [ListComponent, DetailComponent]
})
class AppComponent implements AfterViewInit {
  @ViewChild(ListComponent) listComponent:ListComponent;
  @ViewChild(DetailComponent) detailComponent: DetailComponent;

  ngAfterViewInit() {
    // afther this point the children are set, so you can use them
    this.detailComponent.doSomething();
  }
}

For live Result https://embed.plnkr.co/h25J1Mv6ioUWVX5g6t5M/

Stayed Informed - Best Angular 2 Interview Questions and Answers

I hope you are enjoying with this post! Please share with you friends. Thank you!!

SHARES

Share

Pin it

Tweet

Share

Share

Share

Buffer

Print

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link.. My Tech Blog - https://www.code-sample.com/ My Books - Book 1 and Book 2