DigitaleBibliothek / Frontend / 99e5b9c8983

Commits

Nathan Buckingham authored 99e5b9c8983 01 Dec 2021

w2p-85140 ds-rss component now adds a button to all search pages and community and collection, link-head service adds the rss to the head element

src/app/core/services/link-head.service.ts

Added

-+
+import { Injectable, Optional, RendererFactory2, ViewEncapsulation, Inject } from '@angular/core';
-+
+import { DOCUMENT } from '@angular/common';
-+
-+
+@Injectable()
-+
+export class LinkHeadService {
-+
+  constructor(
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+    private rendererFactory: RendererFactory2,
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+    @Inject(DOCUMENT) private document
-+
+  ) {
-+
-+
+  }
-+
+  addTag(tag: LinkDefinition, forceCreation?: boolean) {
-+
-+
+    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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+      });
-+
-+
+      const link = renderer.createElement('link');
-+
-+
+      const head = this.document.head;
-+
+      const selector = this._parseSelector(tag);
-+
-+
+      if (head === null) {
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+        throw new Error('<head> not found within DOCUMENT.');
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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);
-+
-+
+    } catch (e) {
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+      console.error('Error within linkService : ', e);
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+    }
-+
+  }
-+
-+
+  removeTag(attrSelector: string) {
-+
+    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: [],
-+
+          data: {}
-+
+        });
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+        const head = this.document.head;
-+
+        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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+        }
-+
+      } catch (e) {
-+
+        console.log('Error while removing tag ' + e.message);
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+      }
-+
+    }
-+
+  }
-+
-+
+  private _parseSelector(tag: LinkDefinition): string {
-+
+    const attr: string = tag.rel ? 'rel' : 'hreflang';
-+
+    return `${attr}="${tag[attr]}"`;
-+
+  }
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+}
-+
-+
+export declare type LinkDefinition = {
-+
+  charset?: string;
-+
+  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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