Creating a custom form validation within a modal window featuring tab navigation, all styled with the latest Bootstrap

Within a modal, I have incorporated a header with tabs and tab content in the body, following the structure of Bootstrap 5. The modal footer includes buttons separated by dots.

When encapsulating the modal body and footer within a form tag for validation purposes, issues arise, especially on mobile devices.

Answer №1

Include a placeholder button within the form for validation purposes. Then utilize JavaScript to handle the actual events and actions.

// Locate and gather all forms requiring custom Bootstrap validation styles
const forms = document.querySelectorAll('.needs-validation')
var form = forms[0];


function custom_submit(event) {
  if (!form.checkValidity()) {
    event.preventDefault()
    event.stopPropagation()
  } else {
    form.submit()
  }
  form.classList.add('was-validated')
  return false;
}

document.querySelector("#my-btn").addEventListener('click', custom_submit)
form.addEventListener('submit', custom_submit);
<link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="33515c5c47404741524373061d011d03">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d8bab7b7acabacaab9a898edf6eaf6e8">[email protected]</a>/dist/js/bootstrap.bundle.min.js"></script>


<form class="row g-3 needs-validation" novalidate>
  <div class="col-sm-4">
    <label for="validationCustom01" class="form-label">First name</label>
    <input type="text" class="form-control" id="validationCustom01" value="Mark" required>
    <div class="valid-feedback">
      Looks good!
    </div>
  </div>
  <div class="col-sm-4">
    <label for="validationCustom02" class="form-label">Last name</label>
    <input type="text" class="form-control" id="validationCustom02" value="Otto" required>
    <div class="valid-feedback">
      Looks good!
    </div>
  </div>
  <div class="col-sm-4">
    <label for="validationCustomUsername" class="form-label">Username</label>
    <div class="input-group has-validation">
      <span class="input-group-text" id="inputGroupPrepend">@</span>
      <input type="text" class="form-control" id="validationCustomUsername" aria-describedby="inputGroupPrepend" required>
      <div class="invalid-feedback">
        Please choose a username.
      </div>
    </div>
  </div>

  <div class="col-12">
    <div class="form-check">
      <input class="form-check-input" type="checkbox" value="" id="invalidCheck" required>
      <label class="form-check-label" for="invalidCheck">
        Agree to terms and conditions
      </label>
      <div class="invalid-feedback">
        You must agree before submitting.
      </div>
    </div>
  </div>
  <div class="col-12">
    <button id="btn" class="btn btn-primary" type="submit" style="display:none">Submit form</button>
  </div>
</form>

<button id="my-btn" class="btn btn-primary" type="submit">I am out of form submit</button>

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