Option tag for a sub-menu

I'm currently working on an application that requires a submenu within the option tag. The idea is that when a user clicks on one of the submenu options, it should appear in the search bar for searching purposes. Unfortunately, I'm facing some challenges with implementing this feature. Below is the code snippet that I've been working with:

<div class="form-row">
            <select class="form-control mx-sm-3"">
            <option selected="selected">Variant</option>
            <option>Protein Variant</option>
            <option>Copy Number Alterations</option>
            <ul class="nav navbar-nav">
                <li class="dropdown">
                    <option href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true"> <span class="nav-label">Services</span> <span class="caret"></span></option>
                    <ul class="dropdown-menu">
                        <option>Service A</option>
                        <option>Service B</option>
                        <option>Service C</option>
                    </ul>
                </li>
            </ul>
            </select>
 </div>

The expected behavior is that when the user hovers over 'service', a new box should display with options 'Service A', 'Service B', 'Service C'.

htmlcssbootstrap-4

Answer №1

Only using HTML allows for the optgroup feature to be implemented:

<select>
  <optgroup label="Swedish Cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
  </optgroup>
  <optgroup label="German Cars">
    <option value="mercedes">Mercedes</option>
    <option value="audi">Audi</option>
  </optgroup>
</select>

If a more specific dropdown is needed, JavaScript can be used for implementation, like shown below:

$(document).ready(function() {
  $('.dropdown-submenu a').on("click", function(e) {
    $(this).parents('ul').find('.dropdown-submenu ul').hide();
    $(this).next('ul').toggle();
    e.stopPropagation();
    e.preventDefault();
  });
});
.dropdown-submenu {
  position: relative;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -1px;
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    All South Africa
  </button>
  <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <li class="dropdown-submenu">
      <a class="dropdown-item" href="#">Variant</a>
      <a class="dropdown-item" href="#">Protein Variant</a>
      <a class="dropdown-item" href="#">Copy Number Alterations</a>
      <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Service A</a></li>
        <li><a class="dropdown-item" href="#">Service B</a></li>
        <li><a class="dropdown-item" href="#">Service C</a></li>
      </ul>
    </li>
  </ul>
</div>

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