Angular Logic: Custom Directives

Unlock the full potential of the framework by creating your own HTML attributes. Manipulate DOM and behavior safely and efficiently.

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Target Element

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Welcome, Developer. Today we unlock the power of Custom Directives. This is how we teach HTML new tricks.

// Angular Core initialized...

Types of Directives

In Angular, components are just directives with a template. Beyond components, there are two main types:

  • Attribute Directives: Change the appearance or behavior of an element, component, or another directive. (e.g., ngClass, ngStyle).
  • Structural Directives: Change the DOM layout by adding and removing DOM elements. (e.g., *ngIf, *ngFor).

Module Integrity Check

Which directive type is responsible for adding or removing elements from the DOM?

Advanced Simulation Labs

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Apply your knowledge in these advanced simulations. All our content is free!

Achievements

🏗️
Directive Designer

Create a valid @Directive class structure.

🎨
DOM Manipulator

Correctly utilize Renderer2 for safe DOM changes.

📐
Structural Architect

Master the syntax for structural directive logic.

Mission: Construct a Safe Directive

Write a directive that uses @Directive with a selector, injects Renderer2, and accepts an @Input.

Ng-Bot Feedback:

> Awaiting TypeScript input...

Challenge: Execution Flow

Arrange the steps to correctly initialize a directive class.

Apply DOM changes (Renderer2)
Define @Directive Decorator
Inject ElementRef/Renderer2

Challenge: Structural Logic

Complete the constructor for a structural directive (`*appIf`).

constructor(
private template:,
private view:
) {}
this.view.(this.template);

Consult Ng-Bot

Angular DevHub

Code Review

Submit your "Highlight Directive" for peer review.

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About the Author

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TodoTutorial Angular Team

Senior Frontend Architects specializing in Enterprise Angular Applications.

Content verified against Angular 17+ standards and best practices.