blog--angular-reactive-forms--reactive-2--1.html

<form [formGroup]="addFriendForm" (ngSubmit)="send()">
    <div>
        <label>Name</label>
        <input type="text" formControlName="name">
    </div>
    <div>
        <label>Email</label>
        <input type="text" formControlName="email">
    </div>
    
    <div>
      <button type="submit" [disabled]="!addFriendForm.valid">Submit</button>
    </div>
</form>