home.component.ts

import { Component, Inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';

declare const loadDocument: any;

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
})

export class HomeComponent {
  public _http: HttpClient;
  public _baseUrl: string;

  async onClickLoadDocument() {
    // get a document from the Web API endpoint 'LoadDocument'
    this._http.get<any>(this._baseUrl + 'api/viewer/loaddocument').subscribe(result => {
      loadDocument(result);
    }, error => console.error(error));
  }
}