Angular 2 has upgraded its Controller functionality by replacing it with Component

I find it a bit challenging to distinguish between Component and Controller. How was the Controller replaced by component in Angular 2? I came across this description of a component:

In Angular, a Component is a distinct type of directive that utilizes a simpler configuration suitable for the structure of component-based applications.

This approach simplifies the process of building an app, resembling the usage of Web Components or following Angular 2's application architecture style.

Benefits of using Components:

  • Simple configuration as compared to regular directives
  • Promotion of best practices and default settings
  • Optimized for component-focused architectures
  • Transition to Angular 2 becomes easier with component directives

Situations where Components are not ideal:

  • Directives requiring actions in compile and pre-link functions, which are unavailable
  • When intricate directive definition options like priority, terminal, multi-element are needed
  • For directives triggered by attributes or CSS classes rather than elements

Source: AngularJs Documentation

Moreover, explore the contrast between Directive vs Component

Despite these explanations, I have been incorporating similar logic in both component and controller.

Would someone be able to elaborate on this? And offer insights on structuring the application from a component-oriented perspective instead of relying solely on controllers.

Answer №1

In terms of the architecture of the application, I wouldn't necessarily distinguish between them as you mentioned. Both concepts essentially refer to the same idea, just presented in a different way. Essentially, they are the same type of entity.

It seems that using the term component is more user-friendly and intuitive compared to controller, especially within the context of MVC where it represents the final "C". Viewing a component as a piece of the UI makes it easier to understand its role. Considering the entire UI as a collection of components each contributing to the overall design, the name 'component' aligns better with Angular's perspective. Personally, I also prefer the term 'component' over 'controller'.

Answer №2

In Angular 2, the component class has taken over the role of the Controller in Angular 1.x thanks to the introduction of ES6 classes.

By utilizing ES6 classes along with Typescript, dependency injection becomes much simpler and more efficient.

Both Angular and Angular 2 feature templates for creating dynamic user interfaces.

Answer №3

Source: (Please note that this tutorial may be based on an older version of the software.). Could still contain valuable information?

An important distinction between components and controllers is that components have self-contained internal structures, acting as isolated entities within a larger system.

Components establish their own hierarchy of scopes, shielded from external influences. They do not share scope with the main application, and vice versa.

By implementing a shadow DOM, components protect their views from interference by encapsulating them. This design choice ensures compatibility across various environments without concerns about CSS conflicts.

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