feat(router): set router-link-active when RouterLink is active

Closes #8376

modules/angular2/src/alt_router/directives/router_link.ts

@@ -26,6 +26,7 @@ export class RouterLink implements OnDestroy {
   private _subscription: any;
 
   @HostBinding() private href: string;
+  @HostBinding('class.router-link-active') private isActive: boolean = false;
 
   constructor(@Optional() private _routeSegment: RouteSegment, private _router: Router) {
     this._subscription =
@@ -53,6 +54,9 @@ export class RouterLink implements OnDestroy {
     let tree = this._router.createUrlTree(this._changes, this._routeSegment);
     if (isPresent(tree)) {
       this.href = this._router.serializeUrl(tree);
+      this.isActive = this._router.urlTree.contains(tree);
+    } else {
+      this.isActive = false;
     }
   }
 }

modules/angular2/src/alt_router/segments.ts

@@ -27,9 +27,7 @@ export class Tree<T> {
 
   pathFromRoot(t: T): T[] { return _findPath(t, this._root, []).map(s => s.value); }
 
-  contains(tree: Tree<T>): boolean {
-    return _contains(this._root, tree._root);
-  }
+  contains(tree: Tree<T>): boolean { return _contains(this._root, tree._root); }
 }
 
 export class UrlTree extends Tree<UrlSegment> {
@@ -59,7 +57,7 @@ function _findPath<T>(expected: T, c: TreeNode<T>, collected: TreeNode<T>[]): Tr
   collected.push(c);
 
   // TODO: vsavkin remove it once recognize is fixed
-  if(_equalValues(expected, c.value)) return collected;
+  if (_equalValues(expected, c.value)) return collected;
 
   for (let cc of c.children) {
     let r = _findPath(expected, cc, ListWrapper.clone(collected));
@@ -81,9 +79,9 @@ function _contains<T>(tree: TreeNode<T>, subtree: TreeNode<T>): boolean {
   return true;
 }
 
-function _equalValues(a:any, b:any):boolean {
+function _equalValues(a: any, b: any): boolean {
   if (a instanceof RouteSegment) return equalSegments(<any>a, <any>b);
-  if (a instanceof UrlSegment) return equalUrlSegments(<any>a, <any>b)
+  if (a instanceof UrlSegment) return equalUrlSegments(<any>a, <any>b);
   return a === b;
 }
 
@@ -156,6 +154,7 @@ export function equalSegments(a: RouteSegment, b: RouteSegment): boolean {
 export function equalUrlSegments(a: UrlSegment, b: UrlSegment): boolean {
   if (isBlank(a) && !isBlank(b)) return false;
   if (!isBlank(a) && isBlank(b)) return false;
+  if (a.segment != b.segment) return false;
   if (a.outlet != b.outlet) return false;
   if (isBlank(a.parameters) && !isBlank(b.parameters)) return false;
   if (!isBlank(a.parameters) && isBlank(b.parameters)) return false;

modules/angular2/test/alt_router/integration_spec.ts

@@ -192,6 +192,24 @@ export function main() {
                .toHaveText('team 22 { relativelink { simple }, aux:  }');
          })));
 
+      it("should set the router-link-active class",
+         fakeAsync(inject([Router, TestComponentBuilder], (router, tcb) => {
+           let fixture = tcb.createFakeAsync(RootCmp);
+           advance(fixture);
+
+           router.navigateByUrl('/team/22/relativelink');
+           advance(fixture);
+           expect(fixture.debugElement.nativeElement)
+               .toHaveText('team 22 { relativelink {  }, aux:  }');
+           let link = DOM.querySelector(fixture.debugElement.nativeElement, "a");
+           expect(DOM.hasClass(link, "router-link-active")).toEqual(false);
+
+           DOM.dispatchEvent(link, DOM.createMouseEvent('click'));
+           advance(fixture);
+
+           expect(DOM.hasClass(link, "router-link-active")).toEqual(true);
+         })));
+
       it("should update router links when router changes",
          fakeAsync(inject([Router, TestComponentBuilder], (router, tcb) => {
            let fixture = tcb.createFakeAsync(RootCmp);

modules/angular2/test/alt_router/tree_spec.ts

@@ -49,12 +49,14 @@ export function main() {
 
     describe("contains", () => {
       it("should work", () => {
-        let tree = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, []), new TreeNode<number>(3, [])]));
+        let tree = new Tree<any>(
+            new TreeNode<number>(1, [new TreeNode<number>(2, []), new TreeNode<number>(3, [])]));
         let subtree1 = new Tree<any>(new TreeNode<number>(1, []));
         let subtree2 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [])]));
         let subtree3 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(3, [])]));
         let notSubtree1 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(4, [])]));
-        let notSubtree2 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [new TreeNode<number>(4, [])])]));
+        let notSubtree2 = new Tree<any>(
+            new TreeNode<number>(1, [new TreeNode<number>(2, [new TreeNode<number>(4, [])])]));
 
         expect(tree.contains(subtree1)).toEqual(true);
         expect(tree.contains(subtree2)).toEqual(true);