source: trip-planner-front/src/app/homepage/register/register.component.html

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet"
    integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">


<div class="readersack">
    <div class="container">
        <div class="row">
            <div class="col-md-6 offset-md-3">
                <form [formGroup]="form" #myform="ngForm" (ngSubmit)="onFormSubmitSignUp(user)">
                    <div class="form-group">
                        <label>Full name</label>
                        <input formControlName="fullName" id="fullName" type="text" class="form-control"
                            [(ngModel)]="user.fullName"
                            [ngClass]="{ 'is-invalid': myform.submitted && form.get('fullName')?.errors?.['required']}" />
                        <div *ngIf="myform.submitted && form.get('fullName')?.errors" class="invalid-feedback">
                            <div *ngIf="form.get('fullName')?.hasError('required') && myform.submitted">
                                Full Name is required
                            </div>
                        </div>

                        <label>Username (email)</label>
                        <input formControlName="username" id="username" type="text" class="form-control"
                            [(ngModel)]="user.username"
                            [ngClass]="{ 'is-invalid': myform.submitted && (form.get('username')?.errors?.['required'] || 
                            form.get('username')?.errors?.['email'] || form.get('username')?.hasError('validateUsername'))}" />
                        <div *ngIf="form.get('username')?.hasError('required') && myform.submitted"
                            class="invalid-feedback">
                            Username is required</div>
                        <div *ngIf="form.get('username')?.hasError('email') && myform.submitted"
                            class="invalid-feedback">
                            Please enter valid email.</div>
                        <div *ngIf="form.get('username')?.hasError('validateUsername') && myform.submitted"
                            class="invalid-feedback">
                            Username already exists</div>



                        <label>Password</label>
                        <input formControlName="password" id="password" type="password" class="form-control"
                            [(ngModel)]="user.password" [ngClass]="{ 'is-invalid': myform.submitted && (form.get('password')?.errors?.['required'] ||
                            form.get('password')?.errors?.['minlength'])}" />
                        <div *ngIf="form.get('password')?.hasError('required') && myform.submitted"
                            class="invalid-feedback">
                            Password is required</div>
                        <div *ngIf="form.get('password')?.errors?.['minlength'] && myform.submitted"
                            class="invalid-feedback">
                            Password must be at least 6 characters long.
                        </div>

                        <label>Confirm password</label>
                        <input formControlName="confirmPassword" id="confirmPassword" type="password"
                            class="form-control" [(ngModel)]="user.confirmPassword"
                            [ngClass]="{ 'is-invalid': myform.submitted && (form.get('confirmPassword')?.errors?.['required'] || 
                            form.get('confirmPassword')?.errors?.['minlength'] || form.get('confirmPassword')?.errors?.['mustMatch'])}" />
                        <div *ngIf="form.get('confirmPassword')?.hasError('required') && myform.submitted"
                            class="invalid-feedback">
                            Confirm Password is required</div>
                        <div *ngIf="form.get('confirmPassword')?.errors?.['minlength'] && myform.submitted"
                            class="invalid-feedback">
                            Confirm Password must be at least 6 characters long.
                        </div>
                        <div *ngIf="form.get('confirmPassword')?.errors?.['mustMatch'] && myform.submitted"
                            class="invalid-feedback">Password and confirm password must match
                        </div>

                        <div class="p-col-12 p-md-4">
                            <button type="submit" pButton pRipple class="p-button-secondary">Submit</button>
                        </div>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>