source: trip-planner-front/src/app/homepage/login/login.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)="onFormLogIn(loginRequest)">
                    <div class="form-group">

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

                        <label>Password</label>
                        <input formControlName="password" id="password" type="password" class="form-control"
                            [(ngModel)]="loginRequest.password" [ngClass]="{ 'is-invalid': myform.submitted && form.get('password')?.errors?.['required']}" />
                        <div *ngIf="form.get('password')?.hasError('required') && myform.submitted"
                            class="invalid-feedback">
                            Password is required</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>