How to Implement a Custom RouteReuseStrategy to Detach Specific Routes in Angular?

Implementing RouteReuseStrategy's shouldDetach for Specific Routes in Angular 2

Background

RouteReuseStrategy allows you to instruct Angular to retain a component instead of destroying it when navigating, optimizing performance and preserving the component's state.

Problem Statement

You want to store the state for routes like "/documents" but not for specific routes like "/documents/:id."

Solution

Implement a custom RouteReuseStrategy by extending the built-in RouteReuseStrategy and overriding the appropriate methods:

import from Angular's router

<code class="typescript">import { RouteReuseStrategy } from '@angular/router';</code>

Create a class implementing RouteReuseStrategy

<code class="typescript">export class CustomRouteReuseStrategy implements RouteReuseStrategy {</code>

Override 'shouldDetach' for Selective Route Storage

<code class="typescript">shouldDetach(route: ActivatedRouteSnapshot): boolean {
  return route.routeConfig?.path === '/documents/id';
}</code>

Provide the Custom Strategy in the NgModule

<code class="typescript">providers: [
  { provide: RouteReuseStrategy, useClass: CustomRouteReuseStrategy },
]</code>

Explanation

• shouldDetach: Controls storage of the route. Return true for routes you want to store. In this scenario, store only "/documents" route.
• shouldAttach: Determines when to re-use a stored route. If this method returns true, Angular will reuse the component instead of recreating it. We don't override this method in our example.

Additional Notes:

• This implementation stores one instance of each qualified route throughout the user's session.
• You can customize further by modifying shouldDetach to control which routes to store based on your requirements.

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