Navigating through Dynamic URL Parameters with RouterLink in an Angular Application

Question

Navigating through Dynamic URL Parameters with RouterLink in an Angular Application

Within my Angular 2 application, there exists a tab section where users can choose from a collection of separate yet contextually connected components. By clicking on one of these links, the corresponding component is loaded based on the routerLink definition, as shown here:

<a class="page-content-header-item" routerLink="/page1" routerLinkActive="selected">Page 1</a>

This functionality was functioning smoothly until we implemented a feature that saves user-selected filter options as parameters in the URL. This way, when they revisit the component, their most recent selections are still visible and applied to the data. For instance, the URL may appear like this after a user has set some filters:

http://somesite.com/page1;language_filter=true;language_selection=English

The code snippet for handling this process looks like so:

public changePage(page, value, type, body)
{
    this.onUserSelection(value, type, body, page);

    this.route.params.subscribe(
        (params: any) => {
            this.page = params['page'];
            this.language_filter = params['language_filter'];
            this.language_selection = params['language_selection'];
        }
    );
    this.router.navigate(
        ['/page1', {
            page: page,
            language_filter: this.language_filter,
            language_selection: this.language_selection,
        }]);
}

This approach works effectively for the primary navigation methods which utilize routing files with configurations like this:

{ path: 'page1', component: Page1Component, canActivate: [AuthGuard], data: {contentId: 'page1'} }

However, in the mentioned tab area, components are loaded based on fixed routerLink parameters. Consequently, when a user returns to a component through this method rather than other available pathways, it overrides the URL parameters due to the hardcoded "page1" loading.

Hence, the previously added URL parameters get erased upon reloading.

Therefore, my query is whether it's possible to modify this piece of code:

<a class="page-content-header-item" routerLink="/page1" routerLinkActive="selected">Page 1</a>

...to allow for dynamic variables? Or should I seek an alternative approach to handle navigation within this tab section?

javascript angular typescript routerlink

Answer 1

Answer №1

Here is my approach using the queryParams feature.

To begin, you can utilize the queryParams directive within the routerLink directive to pass parameters:

<a routerLink="/page1" [queryParams]="fooParams">Page 1</a>
<a routerLink="/page2">Page 2</a>
<router-outlet></router-outlet>

Here, fooParams represents a simple object:

export class MainComponent {
  fooParams = {
    language_filter: true,
    language_selection: 'english'
  }
}

Angular will generate a URL like

href="localhost:4200/page1?language_filter=true&language_selection=english"

Next, you need to intercept the ActivatedRoute in order to extract parameter values from the ActivatedRouteSnapshot. This can be accomplished through a resolver or directly in your component. In this instance, a resolver is employed:

@Injectable()
export class RoutingResolve implements Resolve<any> {
  resolve(routeSnapshot: ActivatedRouteSnapshot) {
    const { language_filter, language_selection } = routeSnapshot.queryParams;
    return { language_filter, language_selection };
  }
}

Subsequently, include the resolver in the route definition:

const ROUTES: Routes = [
  { 
    path: 'page1',
    component: PageOneComponent,
    // Define a resolver to intercept the activatedRoute snapshot before loading the component
    resolve: {
      routing: RoutingResolve
    }
  },
  { 
    path: 'page2',
    component: PageTwoComponent
  }
];

Within PageOneComponent, subscribe to the resolved data and manipulate it as needed, such as updating form values based on queryParams changes.

For a detailed example, refer to this plunker

Ensure to view the preview in a separate window to observe route changes in the browser.

By navigating to Page 1, modifying form values, switching to Page 2, then returning via browser back button, you'll notice the form reflects the params in the URL.

Answer 2

Here is my approach using the queryParams feature.

To begin, you can utilize the queryParams directive within the routerLink directive to pass parameters:

<a routerLink="/page1" [queryParams]="fooParams">Page 1</a>
<a routerLink="/page2">Page 2</a>
<router-outlet></router-outlet>

Here, fooParams represents a simple object:

export class MainComponent {
  fooParams = {
    language_filter: true,
    language_selection: 'english'
  }
}

Angular will generate a URL like

href="localhost:4200/page1?language_filter=true&language_selection=english"

Next, you need to intercept the ActivatedRoute in order to extract parameter values from the ActivatedRouteSnapshot. This can be accomplished through a resolver or directly in your component. In this instance, a resolver is employed:

@Injectable()
export class RoutingResolve implements Resolve<any> {
  resolve(routeSnapshot: ActivatedRouteSnapshot) {
    const { language_filter, language_selection } = routeSnapshot.queryParams;
    return { language_filter, language_selection };
  }
}

Subsequently, include the resolver in the route definition:

const ROUTES: Routes = [
  { 
    path: 'page1',
    component: PageOneComponent,
    // Define a resolver to intercept the activatedRoute snapshot before loading the component
    resolve: {
      routing: RoutingResolve
    }
  },
  { 
    path: 'page2',
    component: PageTwoComponent
  }
];

Within PageOneComponent, subscribe to the resolved data and manipulate it as needed, such as updating form values based on queryParams changes.

For a detailed example, refer to this plunker

Ensure to view the preview in a separate window to observe route changes in the browser.

By navigating to Page 1, modifying form values, switching to Page 2, then returning via browser back button, you'll notice the form reflects the params in the URL.

Navigating through Dynamic URL Parameters with RouterLink in an Angular Application

Answer №1

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