Angular Academy · Lesson

Component Interaction

Learn parent-child component communication.

Lesson 2 of 310 steps

Component Interaction is a free Angular Academy lesson on CoddyKit. This is lesson 2 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Angular Academy learning path, and your progress syncs across the web and the CoddyKit app. The Angular Academy course includes 3 lessons in total.

Component Interaction

In this lesson, you'll learn how components communicate in Angular, especially between parent and child components.

Parent-Child Interaction

Components often need to share data. Parent components can pass data down to child components using input properties.

Using @Input()

Use the @Input() decorator to receive data from a parent component:

@Input() userData: string;

Passing Data to Child

In your parent component template, pass data using property binding:

<app-child [userData]="parentData"></app-child>

Child-to-Parent Communication

Child components communicate upwards using events with the @Output() decorator.

Using @Output()

Create an event emitter to send data from child to parent:

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

Emitting Events

Emit events from the child component:

sendData() {
  this.dataEvent.emit('Hello from Child');
}

Listening to Events in Parent

Handle emitted events in the parent component template:

<app-child (dataEvent)="handleEvent($event)"></app-child>

Summary

You now understand how components can interact through inputs and outputs in Angular. Keep practicing!

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Frequently Asked Questions

Is the “Component Interaction” lesson free?

Yes — any 3 lessons of the Angular Academy learning path, including “Component Interaction”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Angular Academy course includes 3 lessons in total.

What will I learn in “Component Interaction”?

Learn parent-child component communication. You practise Angular Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Angular Academy?

No prior experience is required. Angular Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 3.

How long does the “Component Interaction” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Angular Academy lesson?

Yes. Every Angular Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

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