Angular 5 - Autocomplete value gives only typed letters

[troncomputers]

In my autocomplete I have data from my API. It works fine, but when I select one it gives me only letters that I typed not whole selected item.

    const autoComplete = document.querySelector('.autocomplete');
    this.http.get('http://myapi.com/api/customers')
    .subscribe((result:any[]) => {
      let customers = {};
      for(var i=0;i<result.length;i++)
      {
        customers[result[i].Kod] = null;
      }
      M.Autocomplete.init(autoComplete, {
        data : customers
    });
    });

Is that a normal behavior?

[troncomputers]

Fixed with adding a change event
<input type="text" id="autocomplete_kontrahenci" class="autocomplete" (change)="selectItem($event)">

selectItem(event:any)
{
   this.Variable = event.target.value;
}