@angular/router
Version:
Angular - the routing library
229 lines • 26.7 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, EventEmitter, Input, Optional, Output, 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 } from './router_link';
import * as i0 from "@angular/core";
import * as i1 from "../router";
import * as i2 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>
* ```
*
* The `RouterLinkActive` directive can also be used to set the aria-current attribute
* to provide an alternative distinction for active elements to visually impaired users.
*
* For example, the following code adds the 'active' class to the Home Page link when it is
* indeed active and in such case also sets its aria-current attribute to 'page':
*
* ```
* <a routerLink="/" routerLinkActive="active" ariaCurrentWhenActive="page">Home Page</a>
* ```
*
* @ngModule RouterModule
*
* @publicApi
*/
export class RouterLinkActive {
get isActive() {
return this._isActive;
}
constructor(router, element, renderer, cdr, link) {
this.router = router;
this.element = element;
this.renderer = renderer;
this.cdr = cdr;
this.link = link;
this.classes = [];
this._isActive = false;
/**
* Options to configure how to determine if the router link is active.
*
* These options are passed to the `Router.isActive()` function.
*
* @see Router.isActive
*/
this.routerLinkActiveOptions = { exact: false };
/**
*
* You can use the output `isActiveChange` to get notified each time the link becomes
* active or inactive.
*
* Emits:
* true -> Route is active
* false -> Route is inactive
*
* ```
* <a
* routerLink="/user/bob"
* routerLinkActive="active-link"
* (isActiveChange)="this.onRouterLinkActive($event)">Bob</a>
* ```
*/
this.isActiveChange = new EventEmitter();
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, of(null)).pipe(mergeAll()).subscribe(_ => {
this.update();
this.subscribeToEachLinkOnChanges();
});
}
subscribeToEachLinkOnChanges() {
this.linkInputChangesSubscription?.unsubscribe();
const allLinkChanges = [...this.links.toArray(), this.link]
.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() {
this.routerEventsSubscription.unsubscribe();
this.linkInputChangesSubscription?.unsubscribe();
}
update() {
if (!this.links || !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);
}
});
if (hasActiveLinks && this.ariaCurrentWhenActive !== undefined) {
this.renderer.setAttribute(this.element.nativeElement, 'aria-current', this.ariaCurrentWhenActive.toString());
}
else {
this.renderer.removeAttribute(this.element.nativeElement, 'aria-current');
}
// Emit on isActiveChange after classes are updated
this.isActiveChange.emit(hasActiveLinks);
}
});
}
isLinkActive(router) {
const options = isActiveMatchOptions(this.routerLinkActiveOptions) ?
this.routerLinkActiveOptions :
// While the types should disallow `undefined` here, it's possible without strict inputs
(this.routerLinkActiveOptions.exact || false);
return (link) => link.urlTree ? router.isActive(link.urlTree, options) : false;
}
hasActiveLinks() {
const isActiveCheckFn = this.isLinkActive(this.router);
return this.link && isActiveCheckFn(this.link) || this.links.some(isActiveCheckFn);
}
}
RouterLinkActive.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.1.5", ngImport: i0, type: RouterLinkActive, deps: [{ token: i1.Router }, { token: i0.ElementRef }, { token: i0.Renderer2 }, { token: i0.ChangeDetectorRef }, { token: i2.RouterLink, optional: true }], target: i0.ɵɵFactoryTarget.Directive });
RouterLinkActive.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.1.5", type: RouterLinkActive, isStandalone: true, selector: "[routerLinkActive]", inputs: { routerLinkActiveOptions: "routerLinkActiveOptions", ariaCurrentWhenActive: "ariaCurrentWhenActive", routerLinkActive: "routerLinkActive" }, outputs: { isActiveChange: "isActiveChange" }, queries: [{ propertyName: "links", predicate: RouterLink, descendants: true }], exportAs: ["routerLinkActive"], usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.1.5", ngImport: i0, type: RouterLinkActive, decorators: [{
type: Directive,
args: [{
selector: '[routerLinkActive]',
exportAs: 'routerLinkActive',
standalone: true,
}]
}], ctorParameters: function () { return [{ type: i1.Router }, { type: i0.ElementRef }, { type: i0.Renderer2 }, { type: i0.ChangeDetectorRef }, { type: i2.RouterLink, decorators: [{
type: Optional
}] }]; }, propDecorators: { links: [{
type: ContentChildren,
args: [RouterLink, { descendants: true }]
}], routerLinkActiveOptions: [{
type: Input
}], ariaCurrentWhenActive: [{
type: Input
}], isActiveChange: [{
type: Output
}], routerLinkActive: [{
type: Input
}] } });
/**
* Use instead of `'paths' in options` to be compatible with property renaming
*/
function isActiveMatchOptions(options) {
return !!options.paths;
}
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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, EventEmitter, Input, OnChanges, OnDestroy, Optional, Output, 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';\nimport {IsActiveMatchOptions} from '../url_tree';\n\nimport {RouterLink} 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 * The `RouterLinkActive` directive can also be used to set the aria-current attribute\n * to provide an alternative distinction for active elements to visually impaired users.\n *\n * For example, the following code adds the 'active' class to the Home Page link when it is\n * indeed active and in such case also sets its aria-current attribute to 'page':\n *\n * ```\n * <a routerLink=\"/\" routerLinkActive=\"active\" ariaCurrentWhenActive=\"page\">Home Page</a>\n * ```\n *\n * @ngModule RouterModule\n *\n * @publicApi\n */\n@Directive({\n  selector: '[routerLinkActive]',\n  exportAs: 'routerLinkActive',\n  standalone: true,\n})\nexport class RouterLinkActive implements OnChanges, OnDestroy, AfterContentInit {\n  @ContentChildren(RouterLink, {descendants: true}) links!: QueryList<RouterLink>;\n\n  private classes: string[] = [];\n  private routerEventsSubscription: Subscription;\n  private linkInputChangesSubscription?: Subscription;\n  private _isActive = false;\n\n  get isActive() {\n    return this._isActive;\n  }\n\n  /**\n   * Options to configure how to determine if the router link is active.\n   *\n   * These options are passed to the `Router.isActive()` function.\n   *\n   * @see Router.isActive\n   */\n  @Input() routerLinkActiveOptions: {exact: boolean}|IsActiveMatchOptions = {exact: false};\n\n\n  /**\n   * Aria-current attribute to apply when the router link is active.\n   *\n   * Possible values: `'page'` | `'step'` | `'location'` | `'date'` | `'time'` | `true` | `false`.\n   *\n   * @see {@link https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-current}\n   */\n  @Input() ariaCurrentWhenActive?: 'page'|'step'|'location'|'date'|'time'|true|false;\n\n  /**\n   *\n   * You can use the output `isActiveChange` to get notified each time the link becomes\n   * active or inactive.\n   *\n   * Emits:\n   * true  -> Route is active\n   * false -> Route is inactive\n   *\n   * ```\n   * <a\n   *  routerLink=\"/user/bob\"\n   *  routerLinkActive=\"active-link\"\n   *  (isActiveChange)=\"this.onRouterLinkActive($event)\">Bob</a>\n   * ```\n   */\n  @Output() readonly isActiveChange: EventEmitter<boolean> = new EventEmitter();\n\n  constructor(\n      private router: Router, private element: ElementRef, private renderer: Renderer2,\n      private readonly cdr: ChangeDetectorRef, @Optional() private link?: RouterLink) {\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, of(null)).pipe(mergeAll()).subscribe(_ => {\n      this.update();\n      this.subscribeToEachLinkOnChanges();\n    });\n  }\n\n  private subscribeToEachLinkOnChanges() {\n    this.linkInputChangesSubscription?.unsubscribe();\n    const allLinkChanges = [...this.links.toArray(), this.link]\n                               .filter((link): link is RouterLink => !!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.router.navigated) return;\n    Promise.resolve().then(() => {\n      const hasActiveLinks = this.hasActiveLinks();\n      if (this._isActive !== hasActiveLinks) {\n        this._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        if (hasActiveLinks && this.ariaCurrentWhenActive !== undefined) {\n          this.renderer.setAttribute(\n              this.element.nativeElement, 'aria-current', this.ariaCurrentWhenActive.toString());\n        } else {\n          this.renderer.removeAttribute(this.element.nativeElement, 'aria-current');\n        }\n\n        // Emit on isActiveChange after classes are updated\n        this.isActiveChange.emit(hasActiveLinks);\n      }\n    });\n  }\n\n  private isLinkActive(router: Router): (link: RouterLink) => boolean {\n    const options: boolean|IsActiveMatchOptions =\n        isActiveMatchOptions(this.routerLinkActiveOptions) ?\n        this.routerLinkActiveOptions :\n        // While the types should disallow `undefined` here, it's possible without strict inputs\n        (this.routerLinkActiveOptions.exact || false);\n    return (link: RouterLink) => link.urlTree ? router.isActive(link.urlTree, options) : false;\n  }\n\n  private hasActiveLinks(): boolean {\n    const isActiveCheckFn = this.isLinkActive(this.router);\n    return this.link && isActiveCheckFn(this.link) || this.links.some(isActiveCheckFn);\n  }\n}\n\n/**\n * Use instead of `'paths' in options` to be compatible with property renaming\n */\nfunction isActiveMatchOptions(options: {exact: boolean}|\n                              IsActiveMatchOptions): options is IsActiveMatchOptions {\n  return !!(options as IsActiveMatchOptions).paths;\n}\n"]}