Some have mentioned that utilizing this approach may be more suitable for a Component or a Directive, but delving into the inner workings of Angular can be quite interesting. This framework is highly modular, presenting a great opportunity to delve deeper into Dependency Injection (DI).
The Renderer2 possesses unique qualities in relation to services, particularly in its ability to exert more control over templates through the internal Renderer2Interceptor. Additionally, it operates within a distinct scope compared to providers injected at the root level or other global Angular providers; as it is responsible for rendering the templates of components and directives, its scope is limited to these specific types of declarations. Essentially, the Renderer2 serves as a fundamental provider utilized by Angular to establish declarations with views. Due to this crucial role, it can be injected into them—differentiating it from services which are also marked as @Injectable and handled separately by the Angular DI hierarchy.
In summary, while Renderer2 is accessible to module declarations, it is not available to providers. Declarations are instances requiring attached templates, whereas providers function as singletons where templates hold little significance.
Adopting the RendererFactory would be the sole method to directly inject a Renderer2 into a service.
Your concern regarding creating another instance of Renderer2 holds merit. Referencing a comment on the Angular repository:
rendererFactory.createRenderer(null, null)
offers a solution where omitting concrete parameters results in the default renderer being returned without generating a new instance.
Hence, employing
RendererFactory2.createRenderer(null, null)
simply returns the default
DomRenderer</code. The factory allows for custom renderer creation, ensuring Angular does not produce duplicate <code>DomRenderer</code instances when the factory is invoked.</p>
<p>To acquire the default <code>Renderer2
, inject
RendererFactory2 into the service.
Furthermore, I extend my gratitude to you for recognizing the significance of the Renderer in Angular and your dedication to leveraging its capabilities. It's commendable that you prioritize using this feature over direct DOM manipulation.