Javascript Bootstrap V5表单验证&；Sweetalert2:成功提交后显示成功消息

我有一个基于Bootstrap5的简单表单，带有一个验证选项。如果表单字段使用Sweatalert2成功提交，我将尝试显示警告消息

这是我的代码：

HTML

    <form action="" method="POST" class="needs-validation" novalidate>
        <label for="validationCustomUsername" class="form-label">Username</label>
        <div class="input-group has-validation mb-3">
            <span class="input-group-text" id="inputGroupPrepend">@</span>
            <input type="text" class="form-control" id="validationCustomUsername" placeholder="Username *" aria-describedby="inputGroupPrepend" required />
            <div class="invalid-feedback">
                Please choose a username.
            </div>
        </div>
        <button class="btn btn-primary" type="submit">Submit form</button>
    </form>

(function () {
  'use strict'

  // Fetch all the forms we want to apply custom Bootstrap validation styles to
  var forms = document.querySelectorAll('.needs-validation')

  // Loop over them and prevent submission
  Array.prototype.slice.call(forms)
    .forEach(function (form) {
      form.addEventListener('submit', function (event) {
        if (!form.checkValidity()) {
          event.preventDefault()
          event.stopPropagation()
        }

        form.classList.add('was-validated')
      }, false)
    })
})()