demo/src/app/components/+typeahead/demos/scrollable/scrollable.html
<pre class="card card-block card-header mb-3">Model: {{selected | json}}</pre>
<input [(ngModel)]="selected"
[typeahead]="states"
[typeaheadScrollable]="true"
[typeaheadOptionsInScrollableView]="5"
class="form-control">