src/app/modal.component.ts


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import { Component, ElementRef, Input, OnInit, OnDestroy } from '@angular/core';

import { ModalService } from './modal.service';

@Component({
    selector: 'oid-modal',
    template:
        `<div class="oid-modal">
            <div class="oid-modal-body">
                <ng-content></ng-content>
            </div>
        </div>
        <div class="oid-modal-background"></div>`
})
export class ModalComponent implements OnInit, OnDestroy {
  @Input() id: string;
  private element: any;

  constructor(private modalService: ModalService, private el: ElementRef) {
    this.element = el.nativeElement;
  }

  ngOnInit(): void {
    if (!this.id) {
      console.error('modal must have an id');
      return;
    }

    // move element to bottom of page (just before </body>) so it can be displayed above everything else
    document.body.appendChild(this.element);

    // close modal on background click -- doesn't work
    this.element.addEventListener('click', function (e: any) {
      if (e.target.className === 'oid-modal') {
        this.close();
      }
    });

    // add self (this modal instance) to the modal service so it's accessible from controllers
    this.modalService.add(this);
  }

  // remove self from modal service when component is destroyed
  ngOnDestroy(): void {
    this.modalService.remove(this.id);
    this.element.remove();
  }

  open(): void {
    this.element.style.display = 'block';
    document.body.classList.add('oid-modal-open');
  }

  close(): void {
    this.element.style.display = 'none';
    document.body.classList.remove('oid-modal-open');
  }
}