@angular/router
Version:
Angular - the routing library
173 lines • 20 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { ChangeDetectorRef, ContentChildren, Directive, ElementRef, Input, Optional, QueryList, Renderer2 } from '@angular/core';
import { from, of } from 'rxjs';
import { mergeAll } from 'rxjs/operators';
import { NavigationEnd } from '../events';
import { Router } from '../router';
import { RouterLink, RouterLinkWithHref } from './router_link';
/**
*
* @description
*
* Tracks whether the linked route of an element is currently active, and allows you
* to specify one or more CSS classes to add to the element when the linked route
* is active.
*
* Use this directive to create a visual distinction for elements associated with an active route.
* For example, the following code highlights the word "Bob" when the router
* activates the associated route:
*
* ```
* <a routerLink="/user/bob" routerLinkActive="active-link">Bob</a>
* ```
*
* Whenever the URL is either '/user' or '/user/bob', the "active-link" class is
* added to the anchor tag. If the URL changes, the class is removed.
*
* You can set more than one class using a space-separated string or an array.
* For example:
*
* ```
* <a routerLink="/user/bob" routerLinkActive="class1 class2">Bob</a>
* <a routerLink="/user/bob" [routerLinkActive]="['class1', 'class2']">Bob</a>
* ```
*
* To add the classes only when the URL matches the link exactly, add the option `exact: true`:
*
* ```
* <a routerLink="/user/bob" routerLinkActive="active-link" [routerLinkActiveOptions]="{exact:
* true}">Bob</a>
* ```
*
* To directly check the `isActive` status of the link, assign the `RouterLinkActive`
* instance to a template variable.
* For example, the following checks the status without assigning any CSS classes:
*
* ```
* <a routerLink="/user/bob" routerLinkActive #rla="routerLinkActive">
* Bob {{ rla.isActive ? '(already open)' : ''}}
* </a>
* ```
*
* You can apply the `RouterLinkActive` directive to an ancestor of linked elements.
* For example, the following sets the active-link class on the `<div>` parent tag
* when the URL is either '/user/jim' or '/user/bob'.
*
* ```
* <div routerLinkActive="active-link" [routerLinkActiveOptions]="{exact: true}">
* <a routerLink="/user/jim">Jim</a>
* <a routerLink="/user/bob">Bob</a>
* </div>
* ```
*
* @ngModule RouterModule
*
* @publicApi
*/
export class RouterLinkActive {
constructor(router, element, renderer, cdr, link, linkWithHref) {
this.router = router;
this.element = element;
this.renderer = renderer;
this.cdr = cdr;
this.link = link;
this.linkWithHref = linkWithHref;
this.classes = [];
this.isActive = false;
this.routerLinkActiveOptions = { exact: false };
this.routerEventsSubscription = router.events.subscribe((s) => {
if (s instanceof NavigationEnd) {
this.update();
}
});
}
/** @nodoc */
ngAfterContentInit() {
// `of(null)` is used to force subscribe body to execute once immediately (like `startWith`).
of(this.links.changes, this.linksWithHrefs.changes, of(null)).pipe(mergeAll()).subscribe(_ => {
this.update();
this.subscribeToEachLinkOnChanges();
});
}
subscribeToEachLinkOnChanges() {
var _a;
(_a = this.linkInputChangesSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe();
const allLinkChanges = [...this.links.toArray(), ...this.linksWithHrefs.toArray(), this.link, this.linkWithHref]
.filter((link) => !!link)
.map(link => link.onChanges);
this.linkInputChangesSubscription = from(allLinkChanges).pipe(mergeAll()).subscribe(link => {
if (this.isActive !== this.isLinkActive(this.router)(link)) {
this.update();
}
});
}
set routerLinkActive(data) {
const classes = Array.isArray(data) ? data : data.split(' ');
this.classes = classes.filter(c => !!c);
}
/** @nodoc */
ngOnChanges(changes) {
this.update();
}
/** @nodoc */
ngOnDestroy() {
var _a;
this.routerEventsSubscription.unsubscribe();
(_a = this.linkInputChangesSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe();
}
update() {
if (!this.links || !this.linksWithHrefs || !this.router.navigated)
return;
Promise.resolve().then(() => {
const hasActiveLinks = this.hasActiveLinks();
if (this.isActive !== hasActiveLinks) {
this.isActive = hasActiveLinks;
this.cdr.markForCheck();
this.classes.forEach((c) => {
if (hasActiveLinks) {
this.renderer.addClass(this.element.nativeElement, c);
}
else {
this.renderer.removeClass(this.element.nativeElement, c);
}
});
}
});
}
isLinkActive(router) {
return (link) => router.isActive(link.urlTree, this.routerLinkActiveOptions.exact);
}
hasActiveLinks() {
const isActiveCheckFn = this.isLinkActive(this.router);
return this.link && isActiveCheckFn(this.link) ||
this.linkWithHref && isActiveCheckFn(this.linkWithHref) ||
this.links.some(isActiveCheckFn) || this.linksWithHrefs.some(isActiveCheckFn);
}
}
RouterLinkActive.decorators = [
{ type: Directive, args: [{
selector: '[routerLinkActive]',
exportAs: 'routerLinkActive',
},] }
];
RouterLinkActive.ctorParameters = () => [
{ type: Router },
{ type: ElementRef },
{ type: Renderer2 },
{ type: ChangeDetectorRef },
{ type: RouterLink, decorators: [{ type: Optional }] },
{ type: RouterLinkWithHref, decorators: [{ type: Optional }] }
];
RouterLinkActive.propDecorators = {
links: [{ type: ContentChildren, args: [RouterLink, { descendants: true },] }],
linksWithHrefs: [{ type: ContentChildren, args: [RouterLinkWithHref, { descendants: true },] }],
routerLinkActiveOptions: [{ type: Input }],
routerLinkActive: [{ type: Input }]
};
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {AfterContentInit, ChangeDetectorRef, ContentChildren, Directive, ElementRef, Input, OnChanges, OnDestroy, Optional, QueryList, Renderer2, SimpleChanges} from '@angular/core';\nimport {from, of, Subscription} from 'rxjs';\nimport {mergeAll} from 'rxjs/operators';\n\nimport {Event, NavigationEnd} from '../events';\nimport {Router} from '../router';\n\nimport {RouterLink, RouterLinkWithHref} from './router_link';\n\n\n/**\n *\n * @description\n *\n * Tracks whether the linked route of an element is currently active, and allows you\n * to specify one or more CSS classes to add to the element when the linked route\n * is active.\n *\n * Use this directive to create a visual distinction for elements associated with an active route.\n * For example, the following code highlights the word \"Bob\" when the router\n * activates the associated route:\n *\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive=\"active-link\">Bob</a>\n * ```\n *\n * Whenever the URL is either '/user' or '/user/bob', the \"active-link\" class is\n * added to the anchor tag. If the URL changes, the class is removed.\n *\n * You can set more than one class using a space-separated string or an array.\n * For example:\n *\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive=\"class1 class2\">Bob</a>\n * <a routerLink=\"/user/bob\" [routerLinkActive]=\"['class1', 'class2']\">Bob</a>\n * ```\n *\n * To add the classes only when the URL matches the link exactly, add the option `exact: true`:\n *\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive=\"active-link\" [routerLinkActiveOptions]=\"{exact:\n * true}\">Bob</a>\n * ```\n *\n * To directly check the `isActive` status of the link, assign the `RouterLinkActive`\n * instance to a template variable.\n * For example, the following checks the status without assigning any CSS classes:\n *\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive #rla=\"routerLinkActive\">\n *   Bob {{ rla.isActive ? '(already open)' : ''}}\n * </a>\n * ```\n *\n * You can apply the `RouterLinkActive` directive to an ancestor of linked elements.\n * For example, the following sets the active-link class on the `<div>`  parent tag\n * when the URL is either '/user/jim' or '/user/bob'.\n *\n * ```\n * <div routerLinkActive=\"active-link\" [routerLinkActiveOptions]=\"{exact: true}\">\n *   <a routerLink=\"/user/jim\">Jim</a>\n *   <a routerLink=\"/user/bob\">Bob</a>\n * </div>\n * ```\n *\n * @ngModule RouterModule\n *\n * @publicApi\n */\n@Directive({\n  selector: '[routerLinkActive]',\n  exportAs: 'routerLinkActive',\n})\nexport class RouterLinkActive implements OnChanges, OnDestroy, AfterContentInit {\n  @ContentChildren(RouterLink, {descendants: true}) links!: QueryList<RouterLink>;\n  @ContentChildren(RouterLinkWithHref, {descendants: true})\n  linksWithHrefs!: QueryList<RouterLinkWithHref>;\n\n  private classes: string[] = [];\n  private routerEventsSubscription: Subscription;\n  private linkInputChangesSubscription?: Subscription;\n  public readonly isActive: boolean = false;\n\n  @Input() routerLinkActiveOptions: {exact: boolean} = {exact: false};\n\n  constructor(\n      private router: Router, private element: ElementRef, private renderer: Renderer2,\n      private readonly cdr: ChangeDetectorRef, @Optional() private link?: RouterLink,\n      @Optional() private linkWithHref?: RouterLinkWithHref) {\n    this.routerEventsSubscription = router.events.subscribe((s: Event) => {\n      if (s instanceof NavigationEnd) {\n        this.update();\n      }\n    });\n  }\n\n  /** @nodoc */\n  ngAfterContentInit(): void {\n    // `of(null)` is used to force subscribe body to execute once immediately (like `startWith`).\n    of(this.links.changes, this.linksWithHrefs.changes, of(null)).pipe(mergeAll()).subscribe(_ => {\n      this.update();\n      this.subscribeToEachLinkOnChanges();\n    });\n  }\n\n  private subscribeToEachLinkOnChanges() {\n    this.linkInputChangesSubscription?.unsubscribe();\n    const allLinkChanges =\n        [...this.links.toArray(), ...this.linksWithHrefs.toArray(), this.link, this.linkWithHref]\n            .filter((link): link is RouterLink|RouterLinkWithHref => !!link)\n            .map(link => link.onChanges);\n    this.linkInputChangesSubscription = from(allLinkChanges).pipe(mergeAll()).subscribe(link => {\n      if (this.isActive !== this.isLinkActive(this.router)(link)) {\n        this.update();\n      }\n    });\n  }\n\n  @Input()\n  set routerLinkActive(data: string[]|string) {\n    const classes = Array.isArray(data) ? data : data.split(' ');\n    this.classes = classes.filter(c => !!c);\n  }\n\n  /** @nodoc */\n  ngOnChanges(changes: SimpleChanges): void {\n    this.update();\n  }\n  /** @nodoc */\n  ngOnDestroy(): void {\n    this.routerEventsSubscription.unsubscribe();\n    this.linkInputChangesSubscription?.unsubscribe();\n  }\n\n  private update(): void {\n    if (!this.links || !this.linksWithHrefs || !this.router.navigated) return;\n    Promise.resolve().then(() => {\n      const hasActiveLinks = this.hasActiveLinks();\n      if (this.isActive !== hasActiveLinks) {\n        (this as any).isActive = hasActiveLinks;\n        this.cdr.markForCheck();\n        this.classes.forEach((c) => {\n          if (hasActiveLinks) {\n            this.renderer.addClass(this.element.nativeElement, c);\n          } else {\n            this.renderer.removeClass(this.element.nativeElement, c);\n          }\n        });\n      }\n    });\n  }\n\n  private isLinkActive(router: Router): (link: (RouterLink|RouterLinkWithHref)) => boolean {\n    return (link: RouterLink|RouterLinkWithHref) =>\n               router.isActive(link.urlTree, this.routerLinkActiveOptions.exact);\n  }\n\n  private hasActiveLinks(): boolean {\n    const isActiveCheckFn = this.isLinkActive(this.router);\n    return this.link && isActiveCheckFn(this.link) ||\n        this.linkWithHref && isActiveCheckFn(this.linkWithHref) ||\n        this.links.some(isActiveCheckFn) || this.linksWithHrefs.some(isActiveCheckFn);\n  }\n}\n"]}