jQuery toggleClass example

Toggle class name on click in jQuery

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.1.3/js/bootstrap.min.js"></script>
<input class="form-control" id="myInput" type="text" placeholder="Search..">

<select autofocus="True" class="form-control  form-select select" id="asortyment" name="asortyment"><option value="493">Berlin</option><option value="494">Warsaw</option><option value="495">New York</option><option value="496">Moscow</option><option value="497">London</option><option value="498">Paris</option><option value="499">Wien</option></select>

JavaScript

$(document).ready(function(){
  $("#myInput").on("keyup", function() {
   
    var value = $(this).val().toLowerCase();
    var asortyment_tmp = document.getElementById('asortyment');
    $("#asortyment option").filter(function() {
      $(this).toggle($(this).text().toLowerCase().indexOf(value) > -1);
    });



  });
});