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Lazy Loading Modules

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Lazy loading is a design pattern that allows you to load JavaScript components asynchronously when a specific route is activated. This can significantly improve the performance of your Angular application by reducing the initial load time. In this section, we will cover the following topics:

  1. What is Lazy Loading?
  2. Setting Up Lazy Loading in Angular
  3. Creating a Lazy-Loaded Module
  4. Configuring Routes for Lazy Loading
  5. Best Practices for Lazy Loading

  1. What is Lazy Loading?

Lazy loading is a technique where you defer the loading of a module until it is required. This helps in reducing the initial load time of the application, making it faster and more efficient.

Benefits of Lazy Loading:

  • Improved Performance: Only the necessary modules are loaded initially, reducing the initial load time.
  • Better User Experience: Faster load times lead to a smoother user experience.
  • Efficient Resource Utilization: Resources are loaded only when needed, optimizing the use of bandwidth and memory.

  1. Setting Up Lazy Loading in Angular

To set up lazy loading in Angular, you need to follow these steps:

  1. Create a Feature Module: This module will be lazy-loaded.
  2. Configure Routes: Set up the routes to load the module lazily.
  3. Update the Main Routing Module: Modify the main routing module to include the lazy-loaded routes.

  1. Creating a Lazy-Loaded Module

Let's create a feature module named AdminModule that we will lazy load.

Step-by-Step Guide:

  1. Generate the Module:

    ng generate module admin --route admin --module app.module

    This command will create a new module named AdminModule and configure it for lazy loading by adding the necessary route to the AppRoutingModule.

  2. Generate Components for the Module:

    ng generate component admin/dashboard
ng generate component admin/settings

    These commands will create two components, DashboardComponent and SettingsComponent, within the AdminModule.

  1. Configuring Routes for Lazy Loading

Next, we need to configure the routes for the AdminModule.

admin-routing.module.ts:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { DashboardComponent } from './dashboard/dashboard.component';
import { SettingsComponent } from './settings/settings.component';

const routes: Routes = [
  { path: 'dashboard', component: DashboardComponent },
  { path: 'settings', component: SettingsComponent }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class AdminRoutingModule { }

admin.module.ts:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { AdminRoutingModule } from './admin-routing.module';
import { DashboardComponent } from './dashboard/dashboard.component';
import { SettingsComponent } from './settings/settings.component';

@NgModule({
  declarations: [
    DashboardComponent,
    SettingsComponent
  ],
  imports: [
    CommonModule,
    AdminRoutingModule
  ]
})
export class AdminModule { }

  1. Updating the Main Routing Module

Finally, we need to update the main routing module to include the lazy-loaded route.

app-routing.module.ts:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

const routes: Routes = [
  { path: 'admin', loadChildren: () => import('./admin/admin.module').then(m => m.AdminModule) },
  { path: '', redirectTo: '/home', pathMatch: 'full' },
  { path: '**', redirectTo: '/home' }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Best Practices for Lazy Loading

  1. Modularize Your Application: Break down your application into feature modules that can be lazy-loaded.
  2. Optimize Route Configuration: Ensure that your routes are configured correctly to avoid unnecessary loading.
  3. Monitor Performance: Use tools like Angular CLI's built-in performance monitoring to track the impact of lazy loading on your application.

Conclusion

In this section, we learned about lazy loading in Angular, its benefits, and how to set it up in your application. By implementing lazy loading, you can significantly improve the performance and user experience of your Angular applications. In the next module, we will explore forms in Angular, starting with template-driven forms.

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