Component Interaction With Outputs in Angular

Outputs provide a mechanism for a child component to emit events up to its parent component.

This post covers Angular 2 and up

In the parent component’s template, define event bindings as part of the child component’s selector. A binding should point to a method defined in the parent component’s class that takes action on the data received from the child. $event contains the payload emitted from the child:

Parent component template: story.component.html

<selected-story (selectStory)="getStory($event)">
</selected-story>

Parent component class: story.component.ts

export class StoryComponent {
  story: string = '';

  selectStory(story) {
    this.story = story;
  }
}

In the child component, import Output and EventEmitter from @angular/code and define your outputs with the @Output decorator like this:

Child component class: selected-story.component.ts

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

//...

export class SelectedStoryComponent {
  story: string;

  @Output() selectStory = new EventEmitter<string>();

  onSelectStory(story: string) {
    this.selectStory.emit(story);
  }
}

Our EventEmitter object has an emit() method that pushes the event up to the parent component.

Now in the child component’s template, you can define event bindings that will emit back up to the parent:

Child component template: selected-story.component.html

<input #storyChoice placeholder="Your fav story">
<button (click)="onSelectStory(storyChoice.value)">

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