What is Renderer2 in Angular?

Exploring Angular Renderer2: Enhancing Performance and Manipulating Elements

If you’re working with Angular, understanding Renderer2 is crucial. It is an essential API in Angular that facilitates the rendering of virtual DOM, resulting in improved application performance.

Renderer2 is a class that provides an API for manipulating elements within your Angular application without directly interacting with the DOM. It serves a purpose in various scenarios, including server-side rendering, native mobile apps, and applications that lack direct DOM access.

Let’s delve into an example that demonstrates the usage of Renderer2 and its benefits in Angular.

import {Component,Renderer2,ViewChild,ElementRef,
AfterViewInit
} from  "@angular/core";
@Component({
selector: "my-app",
templateUrl: `
<h1 #h1> Hello World</h1>`,
styles: []
})
export  class AppComponent implements AfterViewInit {
@ViewChild("h1") el: ElementRef;
constructor(private rd: Renderer2) {}
	ngAfterViewInit() {
	this.rd.setStyle(this.el.nativeElement, "color", "red");
	}
}

n the above code snippet, we import the necessary dependencies, including Renderer2, ViewChild, ElementRef, and AfterViewInit from the @angular/core package.

The AppComponent class showcases the utilization of Renderer2. We declare a template reference variable, h1, using ViewChild to access the h1 element in our template. The Renderer2 instance is injected via the constructor.

Within the ngAfterViewInit lifecycle hook, we employ the Renderer2 API to manipulate the style of the h1 element. In this case, we set the color of the element to red using the setStyle method.

By utilizing Renderer2, we can perform DOM manipulations and style changes without directly interacting with the DOM. This approach improves performance and ensures compatibility with various environments, such as server-side rendering and native mobile applications.

Conclusion:

Renderer2 is a vital API in Angular that enhances performance and enables element manipulation without direct DOM interaction. By following the example provided above, you can leverage the power of Renderer2 to enhance your Angular applications. Incorporating Renderer2 fosters improved performance, maintainability, and compatibility across different environments.