114 lines
3.5 KiB
TypeScript
114 lines
3.5 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {AfterContentInit, ContentChildren, Directive, ElementRef, Input, OnChanges, OnDestroy, QueryList, Renderer} from '@angular/core';
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import {Subscription} from 'rxjs/Subscription';
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import {NavigationEnd, Router} from '../router';
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import {UrlTree} from '../url_tree';
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import {RouterLink, RouterLinkWithHref} from './router_link';
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/**
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* The RouterLinkActive directive lets you add a CSS class to an element when the link's route
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* becomes active.
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*
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* Consider the following example:
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*
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* ```
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* <a [routerLink]="/user/bob" routerLinkActive="active-link">Bob</a>
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* ```
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*
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* When the url is either '/user' or '/user/bob', the active-link class will
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* be added to the `a` tag. If the url changes, the class will be removed.
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*
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* You can set more than one class, as follows:
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*
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* ```
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* <a [routerLink]="/user/bob" routerLinkActive="class1 class2">Bob</a>
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* <a [routerLink]="/user/bob" routerLinkActive="['class1', 'class2']">Bob</a>
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* ```
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*
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* You can configure RouterLinkActive by passing `exact: true`. This will add the classes
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* only when the url matches the link exactly.
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*
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* ```
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* <a [routerLink]="/user/bob" routerLinkActive="active-link" [routerLinkActiveOptions]="{exact:
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* true}">Bob</a>
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* ```
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*
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* Finally, you can apply the RouterLinkActive directive to an ancestor of a RouterLink.
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*
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* ```
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* <div routerLinkActive="active-link" [routerLinkActiveOptions]="{exact: true}">
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* <a [routerLink]="/user/jim">Jim</a>
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* <a [routerLink]="/user/bob">Bob</a>
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* </div>
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* ```
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*
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* This will set the active-link class on the div tag if the url is either '/user/jim' or
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* '/user/bob'.
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*
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* @stable
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*/
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@Directive({selector: '[routerLinkActive]'})
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export class RouterLinkActive implements OnChanges, OnDestroy, AfterContentInit {
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@ContentChildren(RouterLink, {descendants: true}) links: QueryList<RouterLink>;
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@ContentChildren(RouterLinkWithHref, {descendants: true})
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linksWithHrefs: QueryList<RouterLinkWithHref>;
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private classes: string[] = [];
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private subscription: Subscription;
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@Input() private routerLinkActiveOptions: {exact: boolean} = {exact: false};
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constructor(private router: Router, private element: ElementRef, private renderer: Renderer) {
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this.subscription = router.events.subscribe(s => {
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if (s instanceof NavigationEnd) {
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this.update();
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}
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});
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}
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ngAfterContentInit(): void {
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this.links.changes.subscribe(s => this.update());
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this.linksWithHrefs.changes.subscribe(s => this.update());
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this.update();
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}
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@Input()
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set routerLinkActive(data: string[]|string) {
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if (Array.isArray(data)) {
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this.classes = <any>data;
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} else {
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this.classes = data.split(' ');
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}
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}
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ngOnChanges(changes: {}): any { this.update(); }
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ngOnDestroy(): any { this.subscription.unsubscribe(); }
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private update(): void {
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if (!this.links || !this.linksWithHrefs || !this.router.navigated) return;
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const isActiveLinks = this.reduceList(this.links);
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const isActiveLinksWithHrefs = this.reduceList(this.linksWithHrefs);
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this.classes.forEach(
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c => this.renderer.setElementClass(
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this.element.nativeElement, c, isActiveLinks || isActiveLinksWithHrefs));
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}
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private reduceList(q: QueryList<any>): boolean {
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return q.reduce(
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(res: boolean, link: any) =>
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res || this.router.isActive(link.urlTree, this.routerLinkActiveOptions.exact),
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false);
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}
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}
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