angular submit with required
<form (ngSubmit)="onSubmit()" #testForm="ngForm" ngNativeValidate>
<input type="text" id="test1" name="test1" [(ngModel)]="test" required>
<input type="text" id="test2" name="test2" [(ngModel)]="test" [required]="true">
<input type="text" id="test3" name="test3" [(ngModel)]="test" [attr.required]="true">
<button type="submit">submit</button>
</form>
<-- The important thing here is the "ngNativeValidate" -->