@cisstech/nge
Version:
NG Essentials is a collection of libraries for Angular developers.
175 lines • 21.8 kB
JavaScript
import { DOCUMENT } from '@angular/common';
import { Injectable, inject } from '@angular/core';
import { Observable, forkJoin, from, of } from 'rxjs';
import { concatMap, shareReplay, take } from 'rxjs/operators';
import * as i0 from "@angular/core";
export class ResourceLoaderConfig {
}
class LoadRequest {
get isFinished() {
return this.finished;
}
constructor(asset, document, config) {
this.asset = asset;
this.document = document;
this.config = config;
this.finished = false;
}
run() {
if (this.asset[0] === 'style') {
return this.loadStyle();
}
return this.loadScript();
}
loadStyle() {
return (this.request ??
(this.request = new Observable((observer) => {
const url = this.buildUrl(this.asset[1]);
const style = this.document.createElement('link');
style.href = url;
style.rel = 'stylesheet';
style.onload = () => {
observer.next(this.asset);
observer.complete();
this.finished = true;
};
style.onerror = (err) => {
observer.error(err);
this.finished = true;
};
const attributes = this.asset[2];
if (attributes) {
for (const key in attributes) {
if (attributes.hasOwnProperty(key)) {
style.setAttribute(key, attributes[key]);
}
}
}
this.document.head.appendChild(style);
}).pipe(take(1), shareReplay(1))));
}
loadScript() {
return (this.request ??
(this.request = new Observable((observer) => {
const url = this.buildUrl(this.asset[1]);
const script = this.document.createElement('script');
script.src = url;
script.onload = () => {
observer.next(this.asset);
observer.complete();
this.finished = true;
};
script.onerror = (err) => {
observer.error(err);
this.finished = true;
};
const attributes = this.asset[2];
if (attributes) {
for (const key in attributes) {
if (attributes.hasOwnProperty(key)) {
script.setAttribute(key, attributes[key]);
}
}
}
this.document.head.appendChild(script);
}).pipe(take(1), shareReplay(1))));
}
buildUrl(url) {
if (!this.config?.useDocumentBaseURI) {
return url;
}
if (url.startsWith('http')) {
return url;
}
if (!url.startsWith(document.baseURI)) {
url = url.startsWith('/') ? url.slice(1) : url;
return document.baseURI + url;
}
return url;
}
}
/**
* Services that dynamically inject scripts and styles elements to the DOM.
*/
export class ResourceLoaderService {
constructor() {
this.document = inject(DOCUMENT);
this.config = inject(ResourceLoaderConfig, { optional: true });
this.requests = new Map();
}
waitForPendings() {
return new Promise((resolve) => {
const interval = setInterval(() => {
for (const request of this.requests.values()) {
if (!request.isFinished) {
return;
}
}
clearInterval(interval);
resolve();
}, 100);
});
}
/**
* Injects styles and scripts from given urls to the head of the DOM.
* This method loads assets from same url once and the assets are
* loaded in the same order that given.
* @param resources Resources to load.
*/
loadAllSync(resources) {
if (!resources.length) {
return of([]);
}
const requests = this.createRequests(resources);
return new Observable((observer) => {
const response = [];
const subs = from(requests)
.pipe(concatMap((e) => e.run()))
.subscribe((e) => {
response.push(e);
if (response.length === resources.length) {
observer.next(response);
observer.complete();
}
});
return () => {
subs?.unsubscribe();
};
});
}
/**
* Injects styles and scripts from given urls to target place in DOM
* This method loads style and script from same url once.
* @param resources Resources to load.
*/
loadAllAsync(resources) {
if (!resources.length) {
return of([]);
}
const loaders = this.createRequests(resources);
return forkJoin(loaders.map((e) => e.run()));
}
createRequests(resources) {
return resources.map((asset) => {
const url = asset[1];
let request = this.requests.get(url);
if (!request) {
this.requests.set(url, (request = new LoadRequest(asset, this.document, this.config)));
}
return request;
});
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.1", ngImport: i0, type: ResourceLoaderService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.1", ngImport: i0, type: ResourceLoaderService, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.1", ngImport: i0, type: ResourceLoaderService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root',
}]
}] });
export const ResourceLoaderConfigProvider = (config) => ({
provide: ResourceLoaderConfig,
useValue: config,
});
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{ DOCUMENT } from '@angular/common'\nimport { Injectable, inject } from '@angular/core'\nimport { Observable, forkJoin, from, of } from 'rxjs'\nimport { concatMap, shareReplay, take } from 'rxjs/operators'\n\nexport class ResourceLoaderConfig {\n  /**\n   * If true, the document.baseURI will be used to build the url of the resource to load if the url is relative.\n   */\n  useDocumentBaseURI?: boolean\n}\n\n/**\n *  An array of [type, url, attributes] tuple where:\n *  - `type` is the type of an asset to load `script`| `style`\n *  - `url` is the url to a style/script to load\n *  - `attributes` is a map of optional attributes to add to the element.\n */\ndeclare type ResourceInfo = ['style' | 'script', string, Record<string, string>?]\n\nclass LoadRequest {\n  private request?: Observable<ResourceInfo>\n  private finished = false\n\n  get isFinished(): boolean {\n    return this.finished\n  }\n\n  constructor(\n    private readonly asset: ResourceInfo,\n    private readonly document: Document,\n    private readonly config?: ResourceLoaderConfig | null\n  ) {}\n\n  run() {\n    if (this.asset[0] === 'style') {\n      return this.loadStyle()\n    }\n    return this.loadScript()\n  }\n\n  private loadStyle(): Observable<ResourceInfo> {\n    return (\n      this.request ??\n      (this.request = new Observable<ResourceInfo>((observer) => {\n        const url = this.buildUrl(this.asset[1])\n        const style: HTMLLinkElement = this.document.createElement('link')\n        style.href = url\n        style.rel = 'stylesheet'\n\n        style.onload = () => {\n          observer.next(this.asset)\n          observer.complete()\n          this.finished = true\n        }\n        style.onerror = (err) => {\n          observer.error(err)\n          this.finished = true\n        }\n\n        const attributes = this.asset[2]\n        if (attributes) {\n          for (const key in attributes) {\n            if (attributes.hasOwnProperty(key)) {\n              style.setAttribute(key, attributes[key])\n            }\n          }\n        }\n        this.document.head.appendChild(style)\n      }).pipe(take(1), shareReplay(1)))\n    )\n  }\n\n  private loadScript(): Observable<ResourceInfo> {\n    return (\n      this.request ??\n      (this.request = new Observable<ResourceInfo>((observer) => {\n        const url = this.buildUrl(this.asset[1])\n        const script: HTMLScriptElement = this.document.createElement('script')\n        script.src = url\n\n        script.onload = () => {\n          observer.next(this.asset)\n          observer.complete()\n          this.finished = true\n        }\n        script.onerror = (err) => {\n          observer.error(err)\n          this.finished = true\n        }\n\n        const attributes = this.asset[2]\n        if (attributes) {\n          for (const key in attributes) {\n            if (attributes.hasOwnProperty(key)) {\n              script.setAttribute(key, attributes[key])\n            }\n          }\n        }\n\n        this.document.head.appendChild(script)\n      }).pipe(take(1), shareReplay(1)))\n    )\n  }\n\n  private buildUrl(url: string) {\n    if (!this.config?.useDocumentBaseURI) {\n      return url\n    }\n\n    if (url.startsWith('http')) {\n      return url\n    }\n\n    if (!url.startsWith(document.baseURI)) {\n      url = url.startsWith('/') ? url.slice(1) : url\n      return document.baseURI + url\n    }\n\n    return url\n  }\n}\n\n/**\n * Services that dynamically inject scripts and styles elements to the DOM.\n */\n@Injectable({\n  providedIn: 'root',\n})\nexport class ResourceLoaderService {\n  private readonly document = inject(DOCUMENT)\n  private readonly config = inject(ResourceLoaderConfig, { optional: true })\n  private readonly requests = new Map<string, LoadRequest>()\n\n  waitForPendings(): Promise<void> {\n    return new Promise<void>((resolve) => {\n      const interval = setInterval(() => {\n        for (const request of this.requests.values()) {\n          if (!request.isFinished) {\n            return\n          }\n        }\n        clearInterval(interval)\n        resolve()\n      }, 100)\n    })\n  }\n\n  /**\n   * Injects styles and scripts from given urls to the head of the DOM.\n   * This method loads assets from same url once and the assets are\n   * loaded in the same order that given.\n   * @param resources Resources to load.\n   */\n  loadAllSync(resources: ResourceInfo[]): Observable<ResourceInfo[]> {\n    if (!resources.length) {\n      return of([])\n    }\n    const requests = this.createRequests(resources)\n    return new Observable<ResourceInfo[]>((observer) => {\n      const response: ResourceInfo[] = []\n      const subs = from(requests)\n        .pipe(concatMap((e) => e.run()))\n        .subscribe((e) => {\n          response.push(e)\n          if (response.length === resources.length) {\n            observer.next(response)\n            observer.complete()\n          }\n        })\n      return () => {\n        subs?.unsubscribe()\n      }\n    })\n  }\n\n  /**\n   * Injects styles and scripts from given urls to target place in DOM\n   * This method loads style and script from same url once.\n   * @param resources Resources to load.\n   */\n  loadAllAsync(resources: ResourceInfo[]): Observable<ResourceInfo[]> {\n    if (!resources.length) {\n      return of([])\n    }\n    const loaders = this.createRequests(resources)\n    return forkJoin(loaders.map((e) => e.run()))\n  }\n\n  private createRequests(resources: ResourceInfo[]): LoadRequest[] {\n    return resources.map((asset) => {\n      const url = asset[1]\n      let request = this.requests.get(url)\n      if (!request) {\n        this.requests.set(url, (request = new LoadRequest(asset, this.document, this.config)))\n      }\n      return request\n    })\n  }\n}\n\nexport const ResourceLoaderConfigProvider = (config: Partial<ResourceLoaderConfig>): any => ({\n  provide: ResourceLoaderConfig,\n  useValue: config,\n})\n"]}