<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
<ul class="nav nav-tabs" id="myTab" role="tablist">
  <li class="nav-item">
    <a rel="nofollow" class="nav-link active" id="home-tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
  </li>
  <li class="nav-item">
    <a rel="nofollow" class="nav-link" id="profile-tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false">Profile</a>
  </li>
  <li class="nav-item">
    <a rel="nofollow" class="nav-link" id="contact-tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
  </li>
</ul>
<div class="tab-content" id="myTabContent">
  <div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">
    Home Tab Content<br>
    <input type="text" id="homeText" /> Enter some value
  </div>
  <div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab">Profile Tab Content</div>
  <div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">Contact Tab Content</div>
</div>

$('#myTab a').on('click', function(e) {
  e.preventDefault();
  if (isValid()) {
    $(this).tab('show');
  }
});

function isValid() {
  const text = $("#homeText").val();
  if (text.length === 0) {
    return false;
  }
  return true;
}