Mastering Angular Router Reuse Strategy: Using the Same Component on Two Routes

Are you tired of rebuilding the same component for multiple routes in your Angular application? Do you want to optimize your app’s performance and reduce unnecessary re-renders? Look no further! In this article, we’ll dive into the world of Angular Router Reuse Strategy and explore how to reuse the same component on two routes. Buckle up, folks!

What is Angular Router Reuse Strategy?

The Angular Router Reuse Strategy is a powerful feature that allows you to control how the router reuses or recreates components when navigating between routes. By default, the router destroys and recreates components when switching between routes. This can lead to performance issues and unnecessary re-renders. However, with the right strategy, you can optimize your app’s performance and reduce unnecessary overhead.

Type of Reuse Strategies

Angular provides two types of reuse strategies:

• Default: The default strategy destroys and recreates components when switching between routes.
• Reuse: The reuse strategy reuses the same component instance when switching between routes.

Why Use the Reuse Strategy?

Using the reuse strategy can bring several benefits to your Angular application:

• Improved Performance: By reusing the same component instance, you can reduce the number of unnecessary re-renders and improve your app’s overall performance.
• Reduced Memory Leak Risk: When components are recreated on every route change, they can lead to memory leaks. The reuse strategy helps mitigate this risk by reusing the same component instance.
• Simplified Component Logic: With the reuse strategy, you can simplify your component logic by reducing the number of times it needs to be initialized and destroyed.

Implementing the Reuse Strategy

To implement the reuse strategy, you’ll need to configure the Angular Router to use the Reuse strategy. Here’s a step-by-step guide:

1. Import the RouterModule: In your app module, import the RouterModule and configure it with the reuseStrategy option.
2. Configure the reuseStrategy: Set the reuseStrategy option to 'Reuse' to enable the reuse strategy.
3. Define Your Routes: Define your routes as usual, but make sure to include the data property with a unique value for each route.

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

const routes: Routes = [
  {
    path: 'route1',
    component: MyComponent,
    data: { reuse: 'route1' }
  },
  {
    path: 'route2',
    component: MyComponent,
    data: { reuse: 'route2' }
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes, { reuseStrategy: 'Reuse' })],
  exports: [RouterModule]
})
export class AppModule {}

Using the Same Component on Two Routes

Now that you’ve configured the reuse strategy, let’s explore how to use the same component on two routes. In this example, we’ll create a simple component that displays a greeting message based on the route.

MyComponent

// my.component.ts
import { Component, OnDestroy } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-my',
  template: `
    <h2>Hello from {{ routeName }}!</h2>
  `
})
export class MyComponent implements OnDestroy {
  routeName: string;

  constructor(private route: ActivatedRoute) {
    this.routeName = this.route.snapshot.data.reuse;
  }

  ngOnDestroy(): void {
    console.log('Component destroyed!');
  }
}

In this example, we’ve created a simple component that displays a greeting message based on the route. We’re using the ActivatedRoute to access the route data and retrieve the unique value set in the route configuration.

Route Configuration

Let’s take a closer look at the route configuration:

Route	Component	Data
/route1	MyComponent	{ reuse: ‘route1’ }
/route2	MyComponent	{ reuse: ‘route2’ }

In this example, we’ve defined two routes, route1 and route2, both using the same component, MyComponent. The key difference lies in the data property, where we’ve set a unique value for each route.

Navigation and Reuse

Now that we’ve configured the reuse strategy and defined our routes, let’s explore how the router behaves when navigating between routes:

1. Initial Navigation: When you navigate to route1, the router creates a new instance of MyComponent and initializes it with the route data.
2. Route Change: When you navigate to route2, the router reuses the same instance of MyComponent and updates the route data.
3. Component Lifecycle: Since the component is reused, the ngOnDestroy lifecycle hook is not called when navigating between routes.

Conclusion

In this article, we’ve explored the world of Angular Router Reuse Strategy and learned how to use the same component on two routes. By configuring the reuse strategy and defining unique route data, you can optimize your app’s performance and reduce unnecessary re-renders. Remember to keep your component logic simple and efficient to get the most out of this powerful feature.

Next time you’re building an Angular application, consider using the reuse strategy to take your app’s performance to the next level!

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