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Typeahead

A component to display a list of suggestions following what the user is typing.

The typeahead is an ng-bootstrap component.

This documentation gives only the specifics for a usage within Post project.
Read the complete information about the component's configuration in ng-bootstrap typeahead documentation.

Make sure the @ng-bootstrap/ng-bootstrap package is already present in your project or follow ng-bootstrap installation guidelines.

To import all ng-bootstrap components:

import { NgbModule } from '@ng-bootstrap/ng-bootstrap';

@NgModule({
  imports: [NgbModule],
})
export class YourAppModule {
}

To import only this component:

import {NgbTypeaheadModule} from '@ng-bootstrap/ng-bootstrap';

@NgModule({
  imports: [NgbTypeaheadModule],
})
export class YourAppModule {
}

A typeahead example that gets values from a static string[]

  • debounceTimeoperator
  • kicks in only if 2+ characters typed
  • limits to 10 results
template.html
<div class="form-control-wrapper form-floating mb-3">
  <input
    id="typeahead-basic"
    placeholder=" "
    type="text"
    class="form-control form-control-lg"
    [(ngModel)]="model"
    [ngbTypeahead]="search"
  />
  <label for="typeahead-basic" class="form-label">Search for a US state</label>
</div>
<hr />
<pre>Model: {{ model | json }}</pre>
component.ts
import { Component } from '@angular/core';
import { NgbTypeaheadModule } from '@ng-bootstrap/ng-bootstrap';
import { Observable, OperatorFunction } from 'rxjs';
import { debounceTime, distinctUntilChanged, map } from 'rxjs/operators';
import { FormsModule } from '@angular/forms';
import { JsonPipe } from '@angular/common';

const states = [
  'Alabama',
  'Alaska',
  'American Samoa',
  'Arizona',
  'Arkansas',
  'California',
  'Colorado',
  'Connecticut',
  'Delaware',
  'District Of Columbia',
  'Federated States Of Micronesia',
  'Florida',
  'Georgia',
  'Guam',
  'Hawaii',
  'Idaho',
  'Illinois',
  'Indiana',
  'Iowa',
  'Kansas',
  'Kentucky',
  'Louisiana',
  'Maine',
  'Marshall Islands',
  'Maryland',
  'Massachusetts',
  'Michigan',
  'Minnesota',
  'Mississippi',
  'Missouri',
  'Montana',
  'Nebraska',
  'Nevada',
  'New Hampshire',
  'New Jersey',
  'New Mexico',
  'New York',
  'North Carolina',
  'North Dakota',
  'Northern Mariana Islands',
  'Ohio',
  'Oklahoma',
  'Oregon',
  'Palau',
  'Pennsylvania',
  'Puerto Rico',
  'Rhode Island',
  'South Carolina',
  'South Dakota',
  'Tennessee',
  'Texas',
  'Utah',
  'Vermont',
  'Virgin Islands',
  'Virginia',
  'Washington',
  'West Virginia',
  'Wisconsin',
  'Wyoming',
];

@Component({
  selector: 'ngbd-typeahead-basic',
  standalone: true,
  imports: [NgbTypeaheadModule, FormsModule, JsonPipe],
  templateUrl: './typeahead-basic.html',
  styles: `.form-control { width: 300px; }`,
})
export class NgbdTypeaheadBasic {
  model: any;

  search: OperatorFunction<string, readonly string[]> = (text$: Observable<string>) =>
    text$.pipe(
      debounceTime(200),
      distinctUntilChanged(),
      map(term =>
        term.length < 2
          ? []
          : states.filter(v => v.toLowerCase().indexOf(term.toLowerCase()) > -1).slice(0, 10),
      ),
    );
}