Angular Material Autocomplete force selection

Question

In my angular 5 application I have some matAutocomplete, but I want to force the selection of oone of suggestions, so I am following this approach: stackblitz but for some reas

Answer 1

maybe I'm late, but I fount this https://onthecode.co.uk/force-selection-angular-material-autocomplete/ Really simple solution based on validator:

export function RequireMatch(control: AbstractControl) {
    const selection: any = control.value;
    if (typeof selection === 'string') {
        return { incorrect: true };
    }
    return null;
}