feat(router): add isActive to router

modules/@angular/router/src/directives/router_link_active.ts

@@ -10,7 +10,7 @@ import {AfterContentInit, ContentChildren, Directive, ElementRef, Input, OnChang
 import {Subscription} from 'rxjs/Subscription';
 
 import {NavigationEnd, Router} from '../router';
-import {UrlTree, containsTree} from '../url_tree';
+import {UrlTree} from '../url_tree';
 
 import {RouterLink, RouterLinkWithHref} from './router_link';
 
@@ -97,18 +97,17 @@ export class RouterLinkActive implements OnChanges, OnDestroy, AfterContentInit
   private update(): void {
     if (!this.links || !this.linksWithHrefs || !this.router.navigated) return;
 
-    const currentUrlTree = this.router.parseUrl(this.router.url);
-    const isActiveLinks = this.reduceList(currentUrlTree, this.links);
-    const isActiveLinksWithHrefs = this.reduceList(currentUrlTree, this.linksWithHrefs);
+    const isActiveLinks = this.reduceList(this.links);
+    const isActiveLinksWithHrefs = this.reduceList(this.linksWithHrefs);
     this.classes.forEach(
         c => this.renderer.setElementClass(
             this.element.nativeElement, c, isActiveLinks || isActiveLinksWithHrefs));
   }
 
-  private reduceList(currentUrlTree: UrlTree, q: QueryList<any>): boolean {
+  private reduceList(q: QueryList<any>): boolean {
     return q.reduce(
         (res: boolean, link: any) =>
-            res || containsTree(currentUrlTree, link.urlTree, this.routerLinkActiveOptions.exact),
+            res || this.router.isActive(link.urlTree, this.routerLinkActiveOptions.exact),
         false);
   }
 }

modules/@angular/router/src/router.ts

@@ -31,7 +31,7 @@ import {LoadedRouterConfig, RouterConfigLoader} from './router_config_loader';
 import {RouterOutletMap} from './router_outlet_map';
 import {ActivatedRoute, ActivatedRouteSnapshot, RouterState, RouterStateSnapshot, advanceActivatedRoute, createEmptyState} from './router_state';
 import {PRIMARY_OUTLET, Params} from './shared';
-import {UrlSerializer, UrlTree, createEmptyUrlTree} from './url_tree';
+import {UrlSerializer, UrlTree, containsTree, createEmptyUrlTree} from './url_tree';
 import {andObservables, forEach, merge, shallowEqual, waitForMap, wrapIntoObservable} from './utils/collection';
 import {TreeNode} from './utils/tree';
 
@@ -305,6 +305,18 @@ export class Router {
    */
   parseUrl(url: string): UrlTree { return this.urlSerializer.parse(url); }
 
+  /**
+   * Returns if the url is activated or not.
+   */
+  isActive(url: string|UrlTree, exact: boolean): boolean {
+    if (url instanceof UrlTree) {
+      return containsTree(this.currentUrlTree, url, exact);
+    } else {
+      const urlTree = this.urlSerializer.parse(url);
+      return containsTree(this.currentUrlTree, urlTree, exact);
+    }
+  }
+
   private scheduleNavigation(url: UrlTree, preventPushState: boolean): Promise<boolean> {
     const id = ++this.navigationId;
     this.routerEvents.next(new NavigationStart(id, this.serializeUrl(url)));

tools/public_api_guard/router/index.d.ts

@@ -4,6 +4,7 @@ export declare class ActivatedRoute {
     data: Observable<Data>;
     outlet: string;
     params: Observable<Params>;
+    routeConfig: Route;
     snapshot: ActivatedRouteSnapshot;
     url: Observable<UrlSegment[]>;
     toString(): string;
@@ -15,6 +16,7 @@ export declare class ActivatedRouteSnapshot {
     data: Data;
     outlet: string;
     params: Params;
+    routeConfig: Route;
     url: UrlSegment[];
     toString(): string;
 }
@@ -157,6 +159,7 @@ export declare class Router {
     createUrlTree(commands: any[], {relativeTo, queryParams, fragment, preserveQueryParams, preserveFragment}?: NavigationExtras): UrlTree;
     dispose(): void;
     initialNavigation(): void;
+    isActive(url: string | UrlTree, exact: boolean): boolean;
     navigate(commands: any[], extras?: NavigationExtras): Promise<boolean>;
     navigateByUrl(url: string | UrlTree): Promise<boolean>;
     parseUrl(url: string): UrlTree;