Tutorial

Component Interaction With Inputs in Angular

Published on November 8, 2016
author

Alligator.io

Component Interaction With Inputs in Angular

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Inputs provide a mechanism to allow a parent component to bind properties that a child component can have access to. The parent component pushes the properties to the child component.

This post covers Angular 2 and up

In the parent component’s template, simply define property bindings in the child’s selector. The binding should point to properties available in the parent component’s class on the right side of the equal sign that you want to make available to a the child component. As for the name of the binding itself (left side of the equal sign), it’s totally up to you:

Parent component template: story.component.html
<selected-story [story]="currentStory" [character]="mainCharacter">
</selected-story>
Parent component class: story.component.ts
export class StoryComponent {
  currentStory: string = 'The Fox Without a Tail';
  mainCharacter: string = 'Henry';
}

Now, in the child component, import Input from @angular/code and define your inputs with the @Input decorator like this:

Child component class: selected-story.component.ts
import { Component, Input } from '@angular/core';

//...

Our child component now has access to the value of currentStory and mainCharacter from the parent component. Note how we aliased character to call the property myCharacter in the child component instead:

Child component template: selected-story.component.html
The story: {{ story }}
The character: {{ myCharacter }}

See Also:

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It doesn’t have enough information on how we can send data to a parent component instead. Also, you typed the wrong character variable in selected-story.component.html.

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