How to prevent specific routes from being stored using RouteReuseStrategy\'s shouldDetach method in Angular 2?

How to implement RouteReuseStrategy's shouldDetach for specific routes in Angular 2

Routing is an essential part of any single-page application, and Angular 2's routing capabilities are quite powerful. One of the most useful features of Angular 2's router is the ability to store the state of a route so that it can be reused later. This is done by implementing the RouteReuseStrategy interface.

The RouteReuseStrategy interface has a number of methods that can be implemented to customize how routes are stored and reused. One of the most important methods is shouldDetach, which is used to determine whether or not a route should be stored when the user navigates away from it.

By default, Angular 2 will store the state of all routes that are navigated to. However, there may be times when you want to prevent certain routes from being stored. For example, you may not want to store the state of a route that displays a modal dialog or a loading screen.

To prevent a route from being stored, you can implement the shouldDetach method and return false. This will tell Angular 2 not to store the state of the route when the user navigates away from it.

Here is an example of how to implement the shouldDetach method:

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

@Injectable()
export class CustomRouteReuseStrategy implements RouteReuseStrategy {

  shouldDetach(route: ActivatedRouteSnapshot): boolean {
    // Return `false` to prevent this route from being stored.
    return false;
  }

  store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {}

  shouldAttach(route: ActivatedRouteSnapshot): boolean {
    return false;
  }

  retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle {
    return null;
  }

  shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
    return false;
  }
}</code>

To use this custom route reuse strategy, you can provide it in your NgModule like this:

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

import { AppComponent } from './app.component';
import { CustomRouteReuseStrategy } from './custom-route-reuse-strategy';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    RouterModule.forRoot([
      { path: '', component: AppComponent }
    ], { useHash: true })
  ],
  providers: [
    { provide: RouteReuseStrategy, useClass: CustomRouteReuseStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}</code>

Now, the shouldDetach method of your custom route reuse strategy will be called whenever the user navigates away from a route. You can use this method to determine whether or not the route should be stored.

The above is the detailed content of How to prevent specific routes from being stored using RouteReuseStrategy\'s shouldDetach method in Angular 2?. For more information, please follow other related articles on the PHP Chinese website!