This is how I set the focus on a field in Angular 6. First, I declare the field in HTML:
<input type="text" name="myfield" [(ngModel)]="myfield" id="myfield" #focusMe /> 
Then in Javascript:
@ViewChild('focusMe') focusMe: ElementRef;
.....
this.focusMe.nativeElement.focus();
But I have a table and I need the focus on the first element; I don't know how to set #focusMe:
    <table>
        <tr *ngFor="let f of fields; let i = index">
            <td>
                {{f.name}}
            </td>
            <td>
                <input type="text" name="field{{i}}" [(ngModel)]="f.value" 
                    id="field{{i}}" />
            </td>
        </tr>
    </table> 
How to set the focus on the first input field?
 
    