Angular – Lazy Loading Same Module with Two Routes: The Ultimate Guide

Welcome to the world of Angular lazy loading, where the possibilities are endless, and the complexity can be overwhelming. In this article, we’ll embark on a journey to conquer one of the most intriguing topics in Angular: lazy loading the same module with two routes. Buckle up, folks, and get ready to dive into the depths of Angular routing and module configuration!

What is Lazy Loading in Angular?

Before we dive into the main topic, let’s take a step back and understand what lazy loading is all about in Angular. Lazy loading is a technique used to load modules or components on demand, rather than loading them all at once when the application starts. This approach can significantly improve the application’s performance, reducing the initial load time and minimizing the amount of code that needs to be loaded.

Benefits of Lazy Loading

• Improved performance: Lazy loading reduces the amount of code that needs to be loaded initially, resulting in faster page loads and improved user experience.
• Modularity: Lazy loading allows you to break down your application into smaller, independent modules, making it easier to maintain and update.
• Flexibility: With lazy loading, you can load modules dynamically, creating a more flexible and scalable architecture.

The Challenge: Lazy Loading Same Module with Two Routes

So, what happens when you need to lazy load the same module with two different routes? This is where things can get interesting (and a bit confusing). Suppose you have a module called `orders.module.ts` that needs to be loaded lazily for two different routes: `/orders` and `/orders/history`. How do you configure Angular to achieve this?

The Problem: Route Configuration

The main challenge lies in configuring the routes to load the same module for two different routes. You can’t simply use the same module in both routes, as Angular will throw an error. You need to create a mechanism that allows you to load the same module for different routes, without duplicating code or creating multiple modules.

The Solution: Using Route Parameters and Child Routes

The solution involves using route parameters and child routes to create a hierarchical routing structure. Let’s break it down step by step:

1. Create a parent route with a parameter, e.g., `orders/:type`.
2. Create two child routes with different route parameters, e.g., `orders` and `orders/history`.
3. Configure the lazy loading module to load for both child routes.

// app-routing.module.ts
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { OrdersModule } from './orders/orders.module';

const routes: Routes = [
  {
    path: 'orders/:type',
    loadChildren: () => import('./orders/ orders.module').then(m => m.OrdersModule)
  }
];

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

Child Routes Configuration

Now, let’s configure the child routes to load the `OrdersModule` for both `/orders` and `/orders/history` routes:

// orders-routing.module.ts
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { OrdersComponent } from './orders.component';
import { OrdersHistoryComponent } from './orders-history/orders-history.component';

const routes: Routes = [
  {
    path: '',
    component: OrdersComponent
  },
  {
    path: 'history',
    component: OrdersHistoryComponent
  }
];

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

Lazy Loading Module Configuration

Finally, let’s configure the `OrdersModule` to be lazy loaded for both child routes:

// orders.module.ts
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { OrdersRoutingModule } from './orders-routing.module';
import { OrdersComponent } from './orders.component';
import { OrdersHistoryComponent } from './orders-history/orders-history.component';

@NgModule({
  imports: [
    CommonModule,
    OrdersRoutingModule
  ],
  declarations: [OrdersComponent, OrdersHistoryComponent]
})
export class OrdersModule {}

Route	Parameter	Component
/orders	”	OrdersComponent
/orders/history	‘history’	OrdersHistoryComponent

Conclusion

And there you have it, folks! We’ve successfully lazy loaded the same module with two different routes using route parameters and child routes. This approach allows you to create a flexible and scalable architecture, while maintaining the performance benefits of lazy loading.

Best Practices

• Use route parameters to create a hierarchical routing structure.
• Lazy load modules to improve performance and reduce initial load time.
• Use child routes to create a modular architecture.
• Configure routes carefully to avoid route parameter conflicts.

By following these guidelines and best practices, you’ll be well on your way to creating a robust and efficient Angular application that leverages the power of lazy loading and modular architecture.

Final Thoughts

Angular lazy loading can be a complex topic, but with the right approach and configuration, it can unlock a world of possibilities for your application. Remember to keep it modular, flexible, and scalable, and always prioritize performance and user experience. Happy coding, and see you in the next article!

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