[SOLVED] how to add canonical link in angular 5

how to add canonical link in angular 5

How to add canonical link in angular 5 dynamically

<link rel="canonical" href="http://foobar.com/gotcah"/>

Solution

I got the solution, create link service(ex: link.service.ts) & paste the below code :

import { Injectable, Optional, RendererFactory2, ViewEncapsulation, Inject } from '@angular/core';
import { DOCUMENT } from '@angular/platform-browser';

@Injectable()
export class LinkService {

constructor(
    private rendererFactory: RendererFactory2,
    @Inject(DOCUMENT) private document
) {
}

/**
 * Inject the State into the bottom of the <head>
 */
addTag(tag: LinkDefinition, forceCreation?: boolean) {

    try {
        const renderer = this.rendererFactory.createRenderer(this.document, {
            id: '-1',
            encapsulation: ViewEncapsulation.None,
            styles: [],
            data: {}
        });

        const link = renderer.createElement('link');
        const head = this.document.head;
        const selector = this._parseSelector(tag);

        if (head === null) {
            throw new Error('<head> not found within DOCUMENT.');
        }

        Object.keys(tag).forEach((prop: string) => {
            return renderer.setAttribute(link, prop, tag[prop]);
        });

        // [TODO]: get them to update the existing one (if it exists) ?
        renderer.appendChild(head, link);

    } catch (e) {
        console.error('Error within linkService : ', e);
    }
}

private _parseSelector(tag: LinkDefinition): string {
    // Possibly re-work this
    const attr: string = tag.rel ? 'rel' : 'hreflang';
    return `${attr}="${tag[attr]}"`;
}
}

 export declare type LinkDefinition = {
  charset?: string;
  crossorigin?: string;
  href?: string;
  hreflang?: string;
  media?: string;
  rel?: string;
  rev?: string;
  sizes?: string;
  target?: string;
  type?: string;
} & {
    [prop: string]: string;
};

import service in component :

import { LinkService } from '../link.service';

constructor(private linkService: LinkService) {

this.linkService.addTag( { rel: 'canonical', href: 'url here'} );
}

please refer below link :

https://github.com/angular/angular/issues/15776