Angular - How to Create Custom Elements in Angular
Angular allows you to create custom elements using the Angular Elements package. Angular Elements is a set of Angular directives that helps you convert Angular components into reusable custom elements (also known as web components). This enables you to use Angular components in non-Angular applications or frameworks.
Here are the general steps to create a custom element using Angular:
Install Angular Elements:
Make sure you have Angular CLI installed, and then install Angular Elements using the following command:
ng add @angular/elements.
Create an Angular Component:
Create a new Angular component using the Angular CLI or manually. For example, let's create a simple component named MyCustomElement:
ng generate component my-custom-element
Register the Component as a Custom Element:
In the component file (my-custom-element.component.ts), you need to use the createCustomElement function from @angular/elements to create a custom element from your Angular component:
import { Component, Input, OnInit } from '@angular/core';
import { createCustomElement } from '@angular/elements';
@Component({
selector: 'app-my-custom-element',
template: 'Hello from MyCustomElement!
',
})
export class MyCustomElementComponent implements OnInit {
ngOnInit(): void {
// Register the custom element
const myCustomElement = createCustomElement(MyCustomElementComponent, { injector: this.injector });
customElements.define('my-custom-element', myCustomElement);
}
}
Include the Component in AppModule:
Make sure to include your component in the declarations array of the AppModule and set entryComponents to your custom element:
@NgModule({
declarations: [
// other components...
MyCustomElementComponent,
],
entryComponents: [MyCustomElementComponent],
})
export class AppModule {
constructor(private injector: Injector) {}
ngDoBootstrap() {}
}
Bootstrap the Application:Since you're using Angular Elements, you need to manually bootstrap your application by adding an empty ngDoBootstrap method in the AppModule.
Build the Angular Application:
Build your Angular application using the Angular CLI:
ng build --prod
Include the Built Files:
Include the built files in your non-Angular application (e.g., a simple HTML file). Make sure to include the required polyfills for web components:
Use the Custom Element:
Now you can use your Angular custom element in any HTML file:
Angular Elements is most useful when you need to use Angular components in non-Angular environments. If you're building a full Angular application, you might not need to go through the process of creating custom elements
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