How to Use Angular Elements in Another Angular Project?

You can use Angular elements in another Angular project by following these steps:

1. Building the Angular Element

• Create a new Angular project: Start by creating a new Angular project using the Angular CLI.
• Define the Angular element: Create a component that will be your Angular element. This component should have its own HTML template, CSS styles, and TypeScript logic.
• Register the element: Use the @NgModule decorator to register the component as a custom element. This step involves using the entryComponents and exports properties.
• Build the project: Build the project using ng build to create the production build.
• Create the element bundle: Once built, create a bundle containing the element using ng build --prod --output-hashing=none --build-optimizer=false --elements=my-element. This will create a bundle that can be used in other projects.

2. Consuming the Angular Element

• Include the bundle: Include the generated bundle in your other Angular project's index.html file.
• Register the custom element: Register the custom element in your Angular project using the CUSTOM_ELEMENTS_SCHEMA in your app.module.ts.
• Use the element in your templates: Use the custom element tag in your Angular project's templates.

Example

1. Creating the Angular Element:

// my-element.component.ts
import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-my-element',
  template: `
    <p>My element: {{message}}</p>
  `,
  styles: []
})
export class MyElementComponent {
  @Input() message: string = 'Hello from Angular Element!';
}

// app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { MyElementComponent } from './my-element/my-element.component';

@NgModule({
  declarations: [
    MyElementComponent
  ],
  imports: [
    BrowserModule
  ],
  exports: [
    MyElementComponent
  ],
  entryComponents: [
    MyElementComponent
  ],
  schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
export class AppModule { }

2. Consuming the Angular Element:

<!-- index.html -->
<script src="dist/my-element/my-element.js"></script>

<!-- app.component.html -->
<app-my-element message="Hello from Main Project!"></app-my-element>

Practical Insights

• Versioning: Be mindful of versioning when using Angular elements. Changes in the element's code might break compatibility with the consuming project.
• Testing: Test your Angular elements thoroughly to ensure they function correctly in different environments and with various inputs.
• Documentation: Provide clear documentation for your Angular element, including usage instructions, API details, and potential limitations.