Angular Shared Modules

Overview

In Angular, modules are used to organize related components, directives, and pipes. Shared modules are a type of module that contain common functionality that can be used across multiple modules in your application.

Syntax

Here's the basic syntax to create a shared module in Angular:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { SharedModule } from './shared/shared.module';

@NgModule({
  imports: [
    CommonModule,
    SharedModule
  ],
  exports: [
    SharedModule
  ],
  declarations: []
})
export class MyModule { }

Example

Let's say you're building an e-commerce website and you have a ProductListComponent that displays a list of products. You may also have a ProductDetailComponent that displays detailed information about a specific product. These components may use common functionality such as a ProductService to retrieve data.

Here's how you could create a shared module to provide this common functionality:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { ProductService } from './product.service';

@NgModule({
  imports: [
    CommonModule
  ],
  providers: [
    ProductService
  ]
})
export class SharedModule { }

You can then import the SharedModule into any module that needs access to this common functionality.

Explanation

A shared module is simply a regular Angular module with a specific purpose: to contain common functionality that can be used across multiple parts of your application. Common functionality can include services, directives, pipes, and other components.

When creating a shared module, you'll typically import the CommonModule from @angular/common and any other modules that contain additional functionality that you need. You can also declare any components, directives, or pipes that are specific to the shared module.

One important thing to note is that shared modules should not provide any application-wide services. Rather, they should only provide services that are specific to their own functionality.

Use

The main use of shared modules is to provide common functionality that can be used across multiple modules in your application. This can help you keep your code organized and reduce duplication.

For example, you might have a set of UI components that are used across multiple pages in your application. Instead of duplicating the code for these components in each module, you could create a shared module that provides the components to all of the modules that need them.

Important Points

• Shared modules are a way to provide common functionality that can be used across multiple modules in your application.
• You should import the CommonModule and any other modules that contain functionality that you need in your shared module.
• Shared modules should not provide any application-wide services.
• Shared modules can help you keep your code organized and reduce duplication.

Summary

Shared modules are a powerful tool in Angular for providing common functionality that can be used across multiple modules in your application. By creating shared modules, you can keep your code organized, avoid duplication, and make your application more scalable.