Typeahead is powered by the plugin ngx-bootstrap. Please refer there documentation for further details and instructions here https://valor-software.com/ngx-bootstrap/#/typeahead


First import it to your app module or any submodule as you wish

import { TypeaheadModule } from 'ngx-bootstrap';
  imports: [TypeaheadModule,...]
export class AppModule(){}

How to use

<div class="form-group typehead">
    <input placeholder="States of USA" [(ngModel)]="selectedState" [typeahead]="states"  [typeaheadScrollable]="true" [typeaheadOptionsInScrollableView]="5" class="form-control">

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