feat(router): Add transient info to RouterLink input (#53784)

This is a follow up to 5c1d441029
which added the `info` property to navigation requests. `RouterLink` now
supports passing that transient navigation info to the navigation
request.

This info object can be anything and doesn't have to be serializable.
One use-case might be for passing the element that was clicked. This
might be useful for something like view transitions. In the "animating
with javascript" example from the blog (https://stackblitz.com/edit/stackblitz-starters-cklnkm)
those links could have done this instead of needing to create a separate
directive that tracks clicks.

PR Close #53784

goldens/public-api/router/index.md

@@ -782,6 +782,7 @@ class RouterLink implements OnChanges, OnDestroy {
     constructor(router: Router, route: ActivatedRoute, tabIndexAttribute: string | null | undefined, renderer: Renderer2, el: ElementRef, locationStrategy?: LocationStrategy | undefined);
     fragment?: string;
     href: string | null;
+    info?: unknown;
     // (undocumented)
     static ngAcceptInputType_preserveFragment: unknown;
     // (undocumented)
@@ -808,7 +809,7 @@ class RouterLink implements OnChanges, OnDestroy {
     // (undocumented)
     get urlTree(): UrlTree | null;
     // (undocumented)
-    static ɵdir: i0.ɵɵDirectiveDeclaration<RouterLink, "[routerLink]", never, { "target": { "alias": "target"; "required": false; }; "queryParams": { "alias": "queryParams"; "required": false; }; "fragment": { "alias": "fragment"; "required": false; }; "queryParamsHandling": { "alias": "queryParamsHandling"; "required": false; }; "state": { "alias": "state"; "required": false; }; "relativeTo": { "alias": "relativeTo"; "required": false; }; "preserveFragment": { "alias": "preserveFragment"; "required": false; }; "skipLocationChange": { "alias": "skipLocationChange"; "required": false; }; "replaceUrl": { "alias": "replaceUrl"; "required": false; }; "routerLink": { "alias": "routerLink"; "required": false; }; }, {}, never, never, true, never>;
+    static ɵdir: i0.ɵɵDirectiveDeclaration<RouterLink, "[routerLink]", never, { "target": { "alias": "target"; "required": false; }; "queryParams": { "alias": "queryParams"; "required": false; }; "fragment": { "alias": "fragment"; "required": false; }; "queryParamsHandling": { "alias": "queryParamsHandling"; "required": false; }; "state": { "alias": "state"; "required": false; }; "info": { "alias": "info"; "required": false; }; "relativeTo": { "alias": "relativeTo"; "required": false; }; "preserveFragment": { "alias": "preserveFragment"; "required": false; }; "skipLocationChange": { "alias": "skipLocationChange"; "required": false; }; "replaceUrl": { "alias": "replaceUrl"; "required": false; }; "routerLink": { "alias": "routerLink"; "required": false; }; }, {}, never, never, true, never>;
     // (undocumented)
     static ɵfac: i0.ɵɵFactoryDeclaration<RouterLink, [null, null, { attribute: "tabindex"; }, null, null, null]>;
 }

packages/router/src/directives/router_link.ts

@@ -160,6 +160,13 @@ export class RouterLink implements OnChanges, OnDestroy {
    * @see {@link Router#navigateByUrl}
    */
   @Input() state?: {[k: string]: any};
+  /**
+   * Passed to {@link Router#navigateByUrl} as part of the
+   * `NavigationBehaviorOptions`.
+   * @see {@link NavigationBehaviorOptions#info}
+   * @see {@link Router#navigateByUrl}
+   */
+  @Input() info?: unknown;
   /**
    * Passed to {@link Router#createUrlTree} as part of the
    * `UrlCreationOptions`.
@@ -287,6 +294,7 @@ export class RouterLink implements OnChanges, OnDestroy {
       skipLocationChange: this.skipLocationChange,
       replaceUrl: this.replaceUrl,
       state: this.state,
+      info: this.info,
     };
     this.router.navigateByUrl(this.urlTree, extras);
 

packages/router/test/integration.spec.ts

@@ -7,13 +7,13 @@
  */
 
 import {CommonModule, HashLocationStrategy, Location, LocationStrategy, PlatformLocation, PopStateEvent} from '@angular/common';
-import {ChangeDetectionStrategy, Component, EnvironmentInjector, inject as coreInject, Inject, Injectable, InjectionToken, NgModule, NgModuleRef, NgZone, OnDestroy, QueryList, Type, ViewChild, ViewChildren, ɵConsole as Console, ɵNoopNgZone as NoopNgZone} from '@angular/core';
+import {ApplicationRef, ChangeDetectionStrategy, Component, EnvironmentInjector, inject as coreInject, Inject, Injectable, InjectionToken, NgModule, NgModuleRef, NgZone, OnDestroy, QueryList, Type, ViewChild, ViewChildren, ɵConsole as Console, ɵNoopNgZone as NoopNgZone} from '@angular/core';
 import {ComponentFixture, fakeAsync, inject, TestBed, tick} from '@angular/core/testing';
 import {By} from '@angular/platform-browser/src/dom/debug/by';
 import {expect} from '@angular/platform-browser/testing/src/matchers';
 import {ActivatedRoute, ActivatedRouteSnapshot, ActivationEnd, ActivationStart, ChildActivationEnd, ChildActivationStart, DefaultUrlSerializer, DetachedRouteHandle, Event, GuardsCheckEnd, GuardsCheckStart, Navigation, NavigationCancel, NavigationCancellationCode, NavigationEnd, NavigationError, NavigationSkipped, NavigationStart, ParamMap, Params, PreloadAllModules, PreloadingStrategy, PRIMARY_OUTLET, ResolveEnd, ResolveStart, RouteConfigLoadEnd, RouteConfigLoadStart, Router, RouteReuseStrategy, RouterEvent, RouterLink, RouterLinkActive, RouterModule, RouterOutlet, RouterPreloader, RouterStateSnapshot, RoutesRecognized, RunGuardsAndResolvers, UrlHandlingStrategy, UrlSegment, UrlSegmentGroup, UrlSerializer, UrlTree} from '@angular/router';
 import {RouterTestingHarness} from '@angular/router/testing';
-import {concat, EMPTY, Observable, Observer, of, Subscription} from 'rxjs';
+import {concat, EMPTY, firstValueFrom, Observable, Observer, of, Subscription} from 'rxjs';
 import {delay, filter, first, last, map, mapTo, takeWhile, tap} from 'rxjs/operators';
 
 import {CanActivateChildFn, CanActivateFn, CanMatchFn, Data, ResolveFn} from '../src/models';
@@ -158,6 +158,37 @@ describe('Integration', () => {
       expect(observedInfo).toEqual('navigation info');
     });
 
+    it('should set transient navigation info for routerlink', async () => {
+      let observedInfo: unknown;
+      const router = TestBed.inject(Router);
+      router.resetConfig([
+        {
+          path: 'simple',
+          component: SimpleCmp,
+          canActivate: [() => {
+            observedInfo = coreInject(Router).getCurrentNavigation()?.extras?.info;
+            return true;
+          }]
+        },
+      ]);
+      @Component({
+        standalone: true,
+        imports: [RouterLink],
+        template: `<a #simpleLink [routerLink]="'/simple'" [info]="simpleLink"></a>`
+      })
+      class App {
+      }
+
+      const fixture = TestBed.createComponent(App);
+      fixture.autoDetectChanges();
+      const anchor = fixture.nativeElement.querySelector('a');
+      anchor.click();
+      await fixture.whenStable();
+
+      // An example use-case might be to pass the clicked link along with the navigation information
+      expect(observedInfo).toBeInstanceOf(HTMLAnchorElement);
+    });
+
     it('should make transient navigation info available in redirect', async () => {
       let observedInfo: unknown;
       const router = TestBed.inject(Router);