Contenuti del Corso

Introduction to Angular

1. Angular Fundamentals

What is Angular?The Evolution and Stability of Angular Key Principles of the Framework Setting Up the Environment Getting Started with Angular CLI Angular Project Structure

2. Components and Templates

What Is a Component?The Main Component in Angular Creating a Component Types of Data Binding in Angular Component and Template Interaction in Angular Communication Between Components in Angular

3. Mastering Angular Directives and Pipes

Introduction to Directives in Angular Structural Directives in Angular Attribute Directives in Angular Creating Custom Directives in Angular Introduction to Pipes Creating a Custom Pipe in Angular

4. Services and Dependency Injection in Angular

Introduction to Angular Services Creating a Custom Service in Angular Service Injection into a Component Adding Functionality to Our Application Saving Data to Local Storage in Angular

5. Standalone Components & Modules

Introduction to Modules in Angular Modular Architecture in Angular Transition to Standalone Components How Standalone Components Work in Angular

6. Routing and Navigation in Angular

Routing Basics in Angular Implementing the TaskDetailsComponent Setting Up Routing in Angular Component Communication and Navigation Handling Non-Existent Routes in Angular

Introduction to Directives in Angular

In any web application, it's important not just to display data, but also to control how elements look, behave, and are structured on the page. Angular provides a powerful tool for this — directives. They let you “teach” HTML new behaviors, helping you build flexible templates and logic without extra boilerplate code.

What Are Directives?

Definition

Directives in Angular are instructions for DOM elements (that is, HTML elements) that tell them how to behave or appear. Angular recognizes special attributes or tags in a template — called directives — and performs actions accordingly.

Think of an HTML element like a stage crew member in a theater — just standing there, waiting for instructions. A directive is like the director shouting from off-stage: "Now, come out!", "Change your costume!", or "Disappear!". The element (the crew member) follows the command without asking questions.

Simply put, directives are the mechanism Angular uses to "control" HTML directly from the template.

Types of Directives

Angular includes a few different types of directives, each serving a unique purpose:

Structural Directives

These change the structure of the DOM itself — adding or removing elements from the page. For example, if you want to show a message only when the user is logged in, or display a list of products from an array, a structural directive handles whether the elements appear or not.

Attribute Directives

These affect the appearance or behavior of existing elements — like styles, CSS classes, or event responses. Imagine highlighting an input field when the user makes a mistake, or changing a button's color when you hover over it — that's where attribute directives come in.

Custom Directives

Angular also lets you create your own directives with custom behavior tailored to your app's needs. For example, you can build a directive that automatically focuses on the first form field when the page loads, or one that shows tooltips when hovering over elements. These custom directives help make your app more interactive and personalized.

Why Do We Need Directives?

Directives are a core part of building dynamic, user-friendly, and manageable interfaces in Angular. They let you control the page structure, change how elements look, and reuse logic across your application.