valor-software/ng2-bootstrap

import { Component } from '@angular/core';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import { TypeaheadMatch } from 'ngx-bootstrap/typeahead';

@Component({
  selector: 'demo-typeahead-async',
  templateUrl: './async.html'
})
export class DemoTypeaheadAsyncComponent {
  asyncSelected: string;
  typeaheadLoading: boolean;
  typeaheadNoResults: boolean;
  dataSource: Observable<any>;
  statesComplex: any[] = [
    { id: 1, name: 'Alabama', region: 'South' },
    { id: 2, name: 'Alaska', region: 'West' },
    { id: 3, name: 'Arizona', region: 'West' },
    { id: 4, name: 'Arkansas', region: 'South' },
    { id: 5, name: 'California', region: 'West' },
    { id: 6, name: 'Colorado', region: 'West' },
    { id: 7, name: 'Connecticut', region: 'Northeast' },
    { id: 8, name: 'Delaware', region: 'South' },
    { id: 9, name: 'Florida', region: 'South' },
    { id: 10, name: 'Georgia', region: 'South' },
    { id: 11, name: 'Hawaii', region: 'West' },
    { id: 12, name: 'Idaho', region: 'West' },
    { id: 13, name: 'Illinois', region: 'Midwest' },
    { id: 14, name: 'Indiana', region: 'Midwest' },
    { id: 15, name: 'Iowa', region: 'Midwest' },
    { id: 16, name: 'Kansas', region: 'Midwest' },
    { id: 17, name: 'Kentucky', region: 'South' },
    { id: 18, name: 'Louisiana', region: 'South' },
    { id: 19, name: 'Maine', region: 'Northeast' },
    { id: 21, name: 'Maryland', region: 'South' },
    { id: 22, name: 'Massachusetts', region: 'Northeast' },
    { id: 23, name: 'Michigan', region: 'Midwest' },
    { id: 24, name: 'Minnesota', region: 'Midwest' },
    { id: 25, name: 'Mississippi', region: 'South' },
    { id: 26, name: 'Missouri', region: 'Midwest' },
    { id: 27, name: 'Montana', region: 'West' },
    { id: 28, name: 'Nebraska', region: 'Midwest' },
    { id: 29, name: 'Nevada', region: 'West' },
    { id: 30, name: 'New Hampshire', region: 'Northeast' },
    { id: 31, name: 'New Jersey', region: 'Northeast' },
    { id: 32, name: 'New Mexico', region: 'West' },
    { id: 33, name: 'New York', region: 'Northeast' },
    { id: 34, name: 'North Dakota', region: 'Midwest' },
    { id: 35, name: 'North Carolina', region: 'South' },
    { id: 36, name: 'Ohio', region: 'Midwest' },
    { id: 37, name: 'Oklahoma', region: 'South' },
    { id: 38, name: 'Oregon', region: 'West' },
    { id: 39, name: 'Pennsylvania', region: 'Northeast' },
    { id: 40, name: 'Rhode Island', region: 'Northeast' },
    { id: 41, name: 'South Carolina', region: 'South' },
    { id: 42, name: 'South Dakota', region: 'Midwest' },
    { id: 43, name: 'Tennessee', region: 'South' },
    { id: 44, name: 'Texas', region: 'South' },
    { id: 45, name: 'Utah', region: 'West' },
    { id: 46, name: 'Vermont', region: 'Northeast' },
    { id: 47, name: 'Virginia', region: 'South' },
    { id: 48, name: 'Washington', region: 'South' },
    { id: 49, name: 'West Virginia', region: 'South' },
    { id: 50, name: 'Wisconsin', region: 'Midwest' },
    { id: 51, name: 'Wyoming', region: 'West' }
  ];

  constructor() {
    this.dataSource = Observable.create((observer: any) => {
      // Runs on every search
      observer.next(this.asyncSelected);
    }).mergeMap((token: string) => this.getStatesAsObservable(token));
  }

  getStatesAsObservable(token: string): Observable<any> {
    let query = new RegExp(token, 'ig');

    return Observable.of(
      this.statesComplex.filter((state: any) => {
        return query.test(state.name);
      })
    );
  }

  changeTypeaheadLoading(e: boolean): void {
    this.typeaheadLoading = e;
  }

  typeaheadOnSelect(e: TypeaheadMatch): void {
    console.log('Selected value: ', e.value);
  }
}