JSFiddle - React, Tailwind, and code Playground

HTML

<select id="itemDepartment">
    <option class="placeHolder" value=""> Please Select Department </option>  
  <option value="1">Computer Accessories</option>
  <option value="2">Laptop</option>

</select>

JavaScript

$('#itemDepartment').focus(function() {
    $(this).find(".placeHolder").hide();
}).blur(function() {
    $(this).find(".placeHolder").show();
});