Username: <input type="text" [(ngModel)]="username"> <br />
Password: <input type="password" [(ngModel)]="password"> <br />
Tip:
<select [(ngModel)]="type">
  <option value="kupac">Kupac</option>
  <option value="prodavac">Prodavac</option>
</select>
<br>
<button (click)="login()">Login</button>
<br />
<p class="error">{{error}}</p>