Angular communication between two components

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I'm building a simple web based application using angular version 6.

In my application there is a component which has a child component. There is a function in this component(In the parent component, not the child component.) and I want to invoke that function using a button which is in the child component.

This image explains the format of my components.

I think its regarding to angular @Output. But i can't manage it.

This is how my code has organized.

Parent Component - component.ts file
import { Component, OnInit } from '@angular/core';

  selector: 'app-teacher-home',
  templateUrl: './teacher-home.component.html',
  styleUrls: ['./teacher-home.component.scss']
export class TeacherHomeComponent implements OnInit {

  constructor() { }

  ngOnInit() {

  formView: boolean = false;

    this.formView = !this.formView;
Parent component - component.html file
Child component - component.html file
    <button>Toggle Form view</button>

i want to callthe function toggleForm() of parent component when the button clicked which is in child component.

read this article: Understanding @Output and EventEmitter in Angular

child component:

  selector: 'app-child',
  template: `<button (click)="sendToParent('hi')" >sendToParent</button> `
export class AppChildComponent {
  @Output() childToParent = new EventEmitter;


parent component:

  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
export class AppComponent  {


parent html:

<app-child (childToParent)="toggle($event)"></app-child>

working DEMO

Component interaction, The Parent-Child-Sibling structure of our Angular app. Parent to Child: Sharing Data via Input. This is probably the most common and  Communication Between Components Using @Input () in Angular 2 Passing Data From Parent Component to Child Component. Let us start with passing data from the parent component to the Intercept Input From Parent Component in Child Component. We may have a requirement to intercept data passed from

You have a couple of ways to do this :

  1. Is to create an event inside the child component and then give it a callback, something like this:

    @Output('eventName') buttonPressed = new EventEmitter();

and call buttonPressed.emit() when you want the event to be triggered

on the parent side it will look like this :

    <child-compnent (eventName)="toggleForm()"></child-compnent>
  1. Another way is to create a shared service that will contain the shared functions and data for both components

Sharing Data between Angular Components, There are two ways to pass the data through URLs in Angular: easy ways to pass data back and forth between your components in Angular. This is a quick tutorial to show how you can communicate between components in Angular 8 and RxJS. The way to communicate between components is to use an Observable and a Subject (which is a type of observable), I won't go too much into the details about how observables work here since it's a big subject, but in a nutshell there are two methods

You need to use @Output decorator inside your child component and emit an event when the button present clicked inside your child.

For eg: -

Child component.html

    <button (click)="childButtonClicked()">Toggle Form view</button>

Child component.ts

export class ChildComponent {
  @Output triggerToggle: EventEmitter<any> = new EventEmitter<any>();

   childButtonClicked() {

Parent Component

    <child-compnent (triggerToggle)="toggleForm()"></child-compnent>

Component Communication in Angular, How to communicate between components? This is the topic I saw many new Angular developers to struggle with. I will show you 3 most  Angular 4, angular 5 How to communicate between two Components by using Observable & Subject. Scenario: suppose if button clicked on other component you want to perform some action on another component. In call.service.ts

You can use EventEmitter of angular to listen to events from your child component.


toggleForm($event) {} 


    <child-compnent  (trigger)="toggleForm($event)" ></child-compnent>


@Output() trigger : EventEmitter<any> = new EventEmitter<any>();


3 ways to communicate between Angular components, Communication between the Components in Angular will help you to pass Let's consider an example where PersonChildComponent has two  Communicating with components can be essential given the right reason. In AngularJS, we could achieve this with the use of $broadcast or $emit. However, in Angular, we can use a new style of communicating using EventEmitters like Output. Another option is to communicate between child and parent components using a Service.

Communication Between Components Using Input and Output , In this article, I will introduce two additional solutions to deal with this problem without needing to introduce a state management library to your  As for communication across siblings, I posted an answer in a similar question that might help with the issue of sharing data across sibling components. Currently, i think the shared service method is the most efficient. angular-2-sibling-component-communication

Communicate Between Angular Components Using RxJS, If you are trying to communicate from a parent component to a child component, this is pretty clearly described using @Input and EventEmitters  But now I have a layout of one parent component (which is mostly for the layout) and two child components: The child component 2 have a bunch of buttons, which creates only a simple message. Now I want to display this message in child component one.

How to communicate between component in Angular?, In AngularJS, we could achieve this with the use of $broadcast or $emit . Another option is to communicate between child and parent components using a need to know is that there are two basic ways of interacting between components:. I found that the communication between the two sibling components or from child to parent is difficult. Even it was not mentioned in the angular 2 documentation. Would you please provide some information about it because the way two sibling components communicate is looking complex than the way a parent component communicates with its child

  • Check Angular documentation, specifically section on Component Interaction. Also, do some research before asking, a single search would have returned bunch of answers that cover your use case...
  • when i create that @Output emitter it gives an error in <any> "expected 0 type arguments but got 1"
  • try @Output() childToParent = new EventEmitter;
  • i'm using angular 6
  • its worked.. thank you very much... i'm really appreciate your help
  • its worked.. thank you very much... i'm really appreciate your help