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82 lines
2.0 KiB
TypeScript
82 lines
2.0 KiB
TypeScript
import { Injectable, RendererFactory2, ViewEncapsulation, Inject } from '@angular/core';
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import { DOCUMENT } from '@angular/common';
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/**
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* LinkHead Service injects <link> tag into the head element during runtime.
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*/
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@Injectable()
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export class LinkHeadService {
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constructor(
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private rendererFactory: RendererFactory2,
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@Inject(DOCUMENT) private document
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) {
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}
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addTag(tag: LinkDefinition, forceCreation?: boolean) {
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try {
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const renderer = this.rendererFactory.createRenderer(this.document, {
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id: '-1',
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encapsulation: ViewEncapsulation.None,
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styles: [],
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data: {}
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});
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const link = renderer.createElement('link');
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const head = this.document.head;
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if (head === null) {
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throw new Error('<head> not found within DOCUMENT.');
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}
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Object.keys(tag).forEach((prop: string) => {
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return renderer.setAttribute(link, prop, tag[prop]);
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});
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renderer.appendChild(head, link);
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} catch (e) {
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console.error('Error within linkService : ', e);
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}
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}
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removeTag(attrSelector: string) {
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if (attrSelector) {
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try {
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const renderer = this.rendererFactory.createRenderer(this.document, {
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id: '-1',
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encapsulation: ViewEncapsulation.None,
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styles: [],
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data: {}
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});
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const head = this.document.head;
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if (head === null) {
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throw new Error('<head> not found within DOCUMENT.');
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}
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const linkTags = this.document.querySelectorAll('link[' + attrSelector + ']');
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for (const link of linkTags) {
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renderer.removeChild(head, link);
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}
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} catch (e) {
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console.log('Error while removing tag ' + e.message);
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}
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}
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}
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}
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export declare type LinkDefinition = {
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charset?: string;
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crossorigin?: string;
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href?: string;
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hreflang?: string;
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media?: string;
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rel?: string;
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rev?: string;
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sizes?: string;
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target?: string;
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type?: string;
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} & {
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[prop: string]: string;
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};
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