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import { Injectable, Inject } from '@angular/core';
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import { DOCUMENT } from '@angular/common';
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import { Optional, RendererFactory2, ViewEncapsulation } from '@angular/core';
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@Injectable()
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export class SEOService {
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constructor( @Inject(DOCUMENT) private doc,
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private rendererFactory: RendererFactory2,
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@Inject(DOCUMENT) private document) {
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}
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createLinkForCanonicalURL(url:string, addParameters:boolean=true) {
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this.createLink(url,"relcan", "canonical", addParameters)
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}
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createLinkForCanonicalSearchURL(url:string, addParameters:boolean=true, ) {
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this.createLink(url,"relcan", "canonical", addParameters);
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this.createLink(url,"relnext", "next", addParameters)
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this.createLink(url,"relprev", "prev", addParameters)
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}
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createLinkForNextURL(url:string, addParameters:boolean=true) {
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this.createLink(url,"relnext", "next", addParameters)
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}
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createLinkForPrevURL(url:string, addParameters:boolean=true) {
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this.createLink(url,"relprev", "prev", addParameters)
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}
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createLink(url:string, id:string, relname:string, addParameters:boolean=true) {
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if(this.doc && (typeof this.doc.getElementById === "function" || typeof this.doc.createElement === "function") ){
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if(!addParameters && url && url.indexOf("?") != -1){
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url = url.substring(0,url.indexOf("?"));
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}
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if (typeof this.doc.getElementById === "function") {
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let currentLink: HTMLLinkElement = this.doc.getElementById(id);
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if(currentLink ){
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currentLink.setAttribute('href', url);
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return ;
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}
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}
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if (typeof this.doc.createElement === "function") {
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let link: HTMLLinkElement = this.doc.createElement('link');
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link.setAttribute('id', id);
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link.setAttribute('rel', relname);
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this.doc.head.appendChild(link);
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link.setAttribute('href', url);
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}
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}else{
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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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renderer.setAttribute(link, "rel", relname);
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renderer.setAttribute(link, "href", (addParameters)?url:url.split("?")[0]);
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renderer.setAttribute(link, "id", id);
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// [TODO]: get them to update the existing one (if it exists) ?
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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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}
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removeLinkForNextURL() {
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this.removeLink("relnext", "next");
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}
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removeLinkForPrevURL() {
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this.removeLink("relprev", "prev");
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}
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removeLink( id:string, relname:string) {
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if(this.doc && (typeof this.doc.getElementById === "function" || typeof this.doc.createElement === "function") ){
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if (typeof this.doc.getElementById === "function") {
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let currentLink: HTMLLinkElement = this.doc.getElementById(id);
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if(currentLink ){
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currentLink.setAttribute('href', "");
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currentLink.setAttribute('rel', "");
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return ;
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}
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}
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}
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}
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}
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/*
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* -- LinkService -- [Temporary]
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* @MarkPieszak
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*
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* Similar to Meta service but made to handle <link> creation for SEO purposes
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* -- NOTE: Soon there will be an overall DocumentService within Angular that handles Meta/Link everything
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*/
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//
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// import { Injectable, Optional, RendererFactory2, ViewEncapsulation, Inject } from '@angular/core';
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// import { DOCUMENT } from '@angular/platform-browser';
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//
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// @Injectable()
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// export class LinkService {
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//
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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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/**
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* Inject the State into the bottom of the <head>
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*/
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// addTag(tag: LinkDefinition, forceCreation?: boolean) {
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//
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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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//
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// const link = renderer.createElement('link');
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// const head = this.document.head;
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// const selector = this._parseSelector(tag);
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//
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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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//
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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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//
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// // [TODO]: get them to update the existing one (if it exists) ?
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// renderer.appendChild(head, link);
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//
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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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//
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// private _parseSelector(tag: LinkDefinition): string {
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// // Possibly re-work this
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// const attr: string = tag.rel ? 'rel' : 'hreflang';
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// return `${attr}="${tag[attr]}"`;
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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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