e34c33cd46
When a ServerStylesHost instance is destroyed, all of the shared styles added to the DOM head element by that instance should be removed. Without this removal, over time a large number of style rules will build up and cause extra memory pressure. This brings the ServerStylesHost in line with the DomStylesHost used by the platform browser, which performs this same cleanup. PR Close #38367
44 lines
1.2 KiB
TypeScript
44 lines
1.2 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {DOCUMENT, ɵgetDOM as getDOM} from '@angular/common';
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import {Inject, Injectable, Optional} from '@angular/core';
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import {ɵSharedStylesHost as SharedStylesHost, ɵTRANSITION_ID} from '@angular/platform-browser';
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@Injectable()
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export class ServerStylesHost extends SharedStylesHost {
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private head: any = null;
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private _styleNodes = new Set<HTMLElement>();
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constructor(
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@Inject(DOCUMENT) private doc: any,
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@Optional() @Inject(ɵTRANSITION_ID) private transitionId: string) {
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super();
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this.head = doc.getElementsByTagName('head')[0];
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}
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private _addStyle(style: string): void {
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let adapter = getDOM();
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const el = adapter.createElement('style');
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el.textContent = style;
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if (!!this.transitionId) {
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el.setAttribute('ng-transition', this.transitionId);
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}
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this.head.appendChild(el);
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this._styleNodes.add(el);
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}
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onStylesAdded(additions: Set<string>) {
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additions.forEach(style => this._addStyle(style));
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}
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ngOnDestroy() {
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this._styleNodes.forEach(styleNode => styleNode.remove());
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}
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}
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