hidden

[hidden]  (단 기존과 반대로 동작한다. [hidden]="!newTrustFormVisible")

disabled

참조

[disabled]="!ngForm.valid"

<form #loginForm="ngForm">
    <input type="text" required> 
    <button  type="submit"  [disabled]="!loginForm.form.valid">Submit</button>
</form>