@angular/router
Version:
Angular - the routing library
160 lines (159 loc) • 16.3 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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 * as tslib_1 from "tslib";
import { ChangeDetectorRef, ContentChildren, Directive, ElementRef, Input, QueryList, Renderer2 } from '@angular/core';
import { NavigationEnd } from '../events';
import { Router } from '../router';
import { RouterLink, RouterLinkWithHref } from './router_link';
/**
*
* @description
*
* Lets you add a CSS class to an element when the link's route becomes active.
*
* This directive lets you add a CSS class to an element when the link's route
* becomes active.
*
* Consider the following example:
*
* ```
* <a routerLink="/user/bob" routerLinkActive="active-link">Bob</a>
* ```
*
* When the url is either '/user' or '/user/bob', the active-link class will
* be added to the `a` tag. If the url changes, the class will be removed.
*
* You can set more than one class, as follows:
*
* ```
* <a routerLink="/user/bob" routerLinkActive="class1 class2">Bob</a>
* <a routerLink="/user/bob" [routerLinkActive]="['class1', 'class2']">Bob</a>
* ```
*
* You can configure RouterLinkActive by passing `exact: true`. This will add the classes
* only when the url matches the link exactly.
*
* ```
* <a routerLink="/user/bob" routerLinkActive="active-link" [routerLinkActiveOptions]="{exact:
* true}">Bob</a>
* ```
*
* You can assign the RouterLinkActive instance to a template variable and directly check
* the `isActive` status.
* ```
* <a routerLink="/user/bob" routerLinkActive #rla="routerLinkActive">
* Bob {{ rla.isActive ? '(already open)' : ''}}
* </a>
* ```
*
* Finally, you can apply the RouterLinkActive directive to an ancestor of a RouterLink.
*
* ```
* <div routerLinkActive="active-link" [routerLinkActiveOptions]="{exact: true}">
* <a routerLink="/user/jim">Jim</a>
* <a routerLink="/user/bob">Bob</a>
* </div>
* ```
*
* This will set the active-link class on the div tag if the url is either '/user/jim' or
* '/user/bob'.
*
* @ngModule RouterModule
*
* @publicApi
*/
var RouterLinkActive = /** @class */ (function () {
function RouterLinkActive(router, element, renderer, cdr) {
var _this = this;
this.router = router;
this.element = element;
this.renderer = renderer;
this.cdr = cdr;
this.classes = [];
this.isActive = false;
this.routerLinkActiveOptions = { exact: false };
this.subscription = router.events.subscribe(function (s) {
if (s instanceof NavigationEnd) {
_this.update();
}
});
}
RouterLinkActive.prototype.ngAfterContentInit = function () {
var _this = this;
this.links.changes.subscribe(function (_) { return _this.update(); });
this.linksWithHrefs.changes.subscribe(function (_) { return _this.update(); });
this.update();
};
Object.defineProperty(RouterLinkActive.prototype, "routerLinkActive", {
set: function (data) {
var classes = Array.isArray(data) ? data : data.split(' ');
this.classes = classes.filter(function (c) { return !!c; });
},
enumerable: true,
configurable: true
});
RouterLinkActive.prototype.ngOnChanges = function (changes) { this.update(); };
RouterLinkActive.prototype.ngOnDestroy = function () { this.subscription.unsubscribe(); };
RouterLinkActive.prototype.update = function () {
var _this = this;
if (!this.links || !this.linksWithHrefs || !this.router.navigated)
return;
Promise.resolve().then(function () {
var hasActiveLinks = _this.hasActiveLinks();
if (_this.isActive !== hasActiveLinks) {
_this.isActive = hasActiveLinks;
_this.classes.forEach(function (c) {
if (hasActiveLinks) {
_this.renderer.addClass(_this.element.nativeElement, c);
}
else {
_this.renderer.removeClass(_this.element.nativeElement, c);
}
});
}
});
};
RouterLinkActive.prototype.isLinkActive = function (router) {
var _this = this;
return function (link) {
return router.isActive(link.urlTree, _this.routerLinkActiveOptions.exact);
};
};
RouterLinkActive.prototype.hasActiveLinks = function () {
return this.links.some(this.isLinkActive(this.router)) ||
this.linksWithHrefs.some(this.isLinkActive(this.router));
};
tslib_1.__decorate([
ContentChildren(RouterLink, { descendants: true }),
tslib_1.__metadata("design:type", QueryList)
], RouterLinkActive.prototype, "links", void 0);
tslib_1.__decorate([
ContentChildren(RouterLinkWithHref, { descendants: true }),
tslib_1.__metadata("design:type", QueryList)
], RouterLinkActive.prototype, "linksWithHrefs", void 0);
tslib_1.__decorate([
Input(),
tslib_1.__metadata("design:type", Object)
], RouterLinkActive.prototype, "routerLinkActiveOptions", void 0);
tslib_1.__decorate([
Input(),
tslib_1.__metadata("design:type", Object),
tslib_1.__metadata("design:paramtypes", [Object])
], RouterLinkActive.prototype, "routerLinkActive", null);
RouterLinkActive = tslib_1.__decorate([
Directive({
selector: '[routerLinkActive]',
exportAs: 'routerLinkActive',
}),
tslib_1.__metadata("design:paramtypes", [Router, ElementRef, Renderer2,
ChangeDetectorRef])
], RouterLinkActive);
return RouterLinkActive;
}());
export { RouterLinkActive };
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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, QueryList, Renderer2, SimpleChanges} from '@angular/core';\nimport {Subscription} from 'rxjs';\n\nimport {NavigationEnd, RouterEvent} from '../events';\nimport {Router} from '../router';\n\nimport {RouterLink, RouterLinkWithHref} from './router_link';\n\n\n/**\n *\n * @description\n *\n * Lets you add a CSS class to an element when the link's route becomes active.\n *\n * This directive lets you add a CSS class to an element when the link's route\n * becomes active.\n *\n * Consider the following example:\n *\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive=\"active-link\">Bob</a>\n * ```\n *\n * When the url is either '/user' or '/user/bob', the active-link class will\n * be added to the `a` tag. If the url changes, the class will be removed.\n *\n * You can set more than one class, as follows:\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 * You can configure RouterLinkActive by passing `exact: true`. This will add the classes\n * only when the url matches the link exactly.\n *\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive=\"active-link\" [routerLinkActiveOptions]=\"{exact:\n * true}\">Bob</a>\n * ```\n *\n * You can assign the RouterLinkActive instance to a template variable and directly check\n * the `isActive` status.\n * ```\n * <a routerLink=\"/user/bob\" routerLinkActive #rla=\"routerLinkActive\">\n *   Bob {{ rla.isActive ? '(already open)' : ''}}\n * </a>\n * ```\n *\n * Finally, you can apply the RouterLinkActive directive to an ancestor of a RouterLink.\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 * This will set the active-link class on the div tag if the url is either '/user/jim' or\n * '/user/bob'.\n *\n * @ngModule RouterModule\n *\n * @publicApi\n */\n@Directive({\n  selector: '[routerLinkActive]',\n  exportAs: 'routerLinkActive',\n})\nexport class RouterLinkActive implements OnChanges,\n    OnDestroy, AfterContentInit {\n  // TODO(issue/24571): remove '!'.\n  @ContentChildren(RouterLink, {descendants: true})\n  links !: QueryList<RouterLink>;\n  // TODO(issue/24571): remove '!'.\n  @ContentChildren(RouterLinkWithHref, {descendants: true})\n  linksWithHrefs !: QueryList<RouterLinkWithHref>;\n\n  private classes: string[] = [];\n  private subscription: 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 cdr: ChangeDetectorRef) {\n    this.subscription = router.events.subscribe((s: RouterEvent) => {\n      if (s instanceof NavigationEnd) {\n        this.update();\n      }\n    });\n  }\n\n\n  ngAfterContentInit(): void {\n    this.links.changes.subscribe(_ => this.update());\n    this.linksWithHrefs.changes.subscribe(_ => this.update());\n    this.update();\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  ngOnChanges(changes: SimpleChanges): void { this.update(); }\n  ngOnDestroy(): void { this.subscription.unsubscribe(); }\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.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    return this.links.some(this.isLinkActive(this.router)) ||\n        this.linksWithHrefs.some(this.isLinkActive(this.router));\n  }\n}\n"]}