CODE EXAMPLE FOR JAVASCRIPT

angular validar formulario

<input matInput placeholder="firstname"  class="form-control"  name="firstname" ngModel required>

<input matInput placeholder="lastname" class="form-control"  name="lastname" ngModel required>

<input matInput placeholder="email" class="form-control"  name="email" ngModel required>

<textarea rows="4" cols="50" matInput placeholder="message" class="form-control"  name="message" ngModel required></textarea>