<input type="text" (change)="fill Unit()" formControlName="companyname" [class.is-invalid]="f.company_name.invalid && f.company_name.touched " class="form-control" placeholder="Company Name" >
<input type="text" (change)="fillUnit()" formControlName="company_name" [class.is-invalid]="f.company_name.invalid && f.company_name.touched " class="form-control" placeholder="Company Name" >