Angular Signup Form with validations

signup.html

<div class="w3-container w3-blue">
	<h2>Signup</h2>
</div>

<form (ngSubmit)="onSubmit()" class="w3-container">
	<div>
		<p>Full Name</p>
		<input [(ngModel)]="application.fullname" name="fullname" #fullname="ngModel" class="w3-input w3-leftbar w3-border w3-border-blue" type="text" required minlength="5" [placeholder]="application.fullname" _placeholde="John Doe" />
	</div>
	<div>
		<p>Email</p>
		<input [(ngModel)]="application.email" name="email" #email="ngModel" class="w3-input w3-leftbar w3-border w3-border-blue" type="email" required minlength="5" [placeholder]="application.email" />
	</div>
	<div>
		<p>Phone Number</p>
		<input [(ngModel)]="application.phonenumber" name="phonenumber" #phonenumber="ngModel" class="w3-input w3-leftbar w3-border w3-border-blue" type="tel" required minlength="10" [placeholder]="application.phonenumber" />
	</div>
	<div class="w3-panel w3-pale-red w3-padding" *ngIf="!valid_form()">
		<div class="w3-text-red" *ngIf="fullname.touched && !fullname.valid">Full name is required.</div>
		<div class="w3-text-red" *ngIf="email.touched && !email.valid">Email Address is required.</div>
		<div class="w3-text-red" *ngIf="phonenumber.touched && !phonenumber.valid">Phone Number is required.</div>
	</div>
	<div class="w3-panel" *ngIf="!loading">
		<span class="w3-button w3-purple" (click)="user_applies()">Submit</span>
	</div>
</form>

{{application|json}}