doneit-web/src/app/pages/events/attendee-modal/attendee-modal.page.ts

import { Component, OnInit } from '@angular/core';
import { ModalController } from '@ionic/angular';
import { ContactsService } from 'src/app/services/contacts.service';
import { EventPerson } from 'src/app/models/eventperson.model';
import { ThrowStmt, removeSummaryDuplicates } from '@angular/compiler';

@Component({
  selector: 'app-attendee-modal',
  templateUrl: './attendee-modal.page.html',
  styleUrls: ['./attendee-modal.page.scss'],
})
export class AttendeeModalPage implements OnInit {

  contacts: EventPerson[];
  showLoader: boolean = false;
  eventPersons: EventPerson[];

  constructor(private modalCtrl: ModalController, private contactsService: ContactsService) { }

  ngOnInit() {
    this.fetchContacts("");
  }

  save(){
    this.modalCtrl.dismiss(this.contacts.filter(function(contact) {
      return contact.IsRequired == true;
    }));
  }

  close(){
    this.modalCtrl.dismiss(null);
  }

  onChange(evt: any) {
    this.fetchContacts(evt.detail.value);
  }

  selectContact(itm: EventPerson){
    itm.IsRequired = !itm.IsRequired;
  }

  async fetchContacts(filter: string) {
    this.showLoader = true;

    this.contactsService.getContacts(filter).subscribe(result =>
      {
        if (this.eventPersons != null)
        {
          this.eventPersons.forEach(attendee => {
            const index: number = result.findIndex((cont) => {
              return cont.EmailAddress == attendee.EmailAddress
            });
  
            result.splice(index, 1);
          });
        }

        this.contacts = result;
        this.showLoader = false;
      }
    );
  }

}