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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | 1x 1x 2x 2x 2x 2x 2x | import { NgOptimizedImage } from '@angular/common';
import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
import type { OnDestroy, OnInit } from '@angular/core';
import { Meta } from '@angular/platform-browser';
import type { MetaDefinition } from '@angular/platform-browser';
import { RouterLink } from '@angular/router';
/**
* Block robots from indexing the 404 page.
*/
export const ROBOTS_META: MetaDefinition = {
content: 'noindex, nofollow',
name: 'robots',
} as const;
/**
* Wildcard catchall route component for paths that do not match configured routes.
*/
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
imports: [ NgOptimizedImage, RouterLink ],
selector: 'app-page-not-found',
styleUrl: './page-not-found.component.scss',
templateUrl: './page-not-found.component.html',
})
export class PageNotFoundComponent implements OnDestroy, OnInit {
/** Angular service to manage Meta tags. https://angular.dev/api/platform-browser/Meta */
private readonly _metaService: Meta = inject(Meta);
/** Reference to the meta tag created OnInit to be removed OnDestroy. */
private _robotsTag: HTMLMetaElement | null = null; // eslint-disable-line unicorn/no-null -- DOM uses null
/**
* Remove the robot blocking meta tag from the HTML Head when this Component is no longer the
* routed Component.
*/
public ngOnDestroy(): void {
if (this._robotsTag) {
this._metaService.removeTagElement(this._robotsTag);
}
}
/**
* Prevent robots from indexing this soft 404 page. Note that this probably is only necessary
* with SSR or JavaScript executing web crawlers.
*/
public ngOnInit(): void {
this._robotsTag = this._metaService.addTag(ROBOTS_META);
}
}
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