JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<body>
    <div id="list1" class="dropdown-check-list" tabindex="100">
        <span class="anchor">Select Fruits</span>
        <ul id="items" class="items">
            <li><input type="checkbox" class="apple"/>Apple </li>
            <li><input type="checkbox" />Orange</li>
            <li><input type="checkbox" />Grapes </li>
            <li><input type="checkbox" />Berry </li>
            <li><input type="checkbox" />Mango </li>
            <li><input type="checkbox" />Banana </li>
            <li><input type="checkbox" />Tomato</li>
        </ul>
    </div>
</body>

CSS

.dropdown-check-list {
  display: inline-block;
}
.dropdown-check-list .anchor {
  position: relative;
  cursor: pointer;
  display: inline-block;
  padding: 5px 50px 5px 10px;
  border: 1px solid #ccc;
}
.dropdown-check-list .anchor:after {
  position: absolute;
  content: "";
  border-left: 2px solid black;
  border-top: 2px solid black;
  padding: 5px;
  right: 10px;
  top: 20%;
  -moz-transform: rotate(-135deg);
  -ms-transform: rotate(-135deg);
  -o-transform: rotate(-135deg);
  -webkit-transform: rotate(-135deg);
  transform: rotate(-135deg);
}
.dropdown-check-list .anchor:active:after {
  right: 8px;
  top: 21%;
}
.dropdown-check-list ul.items {
  padding: 2px;
  display: none;
  margin: 0;
  border: 1px solid #ccc;
  border-top: none;
}
.dropdown-check-list ul.items li {
  list-style: none;
}

JavaScript

var checkList = document.getElementById('list1');
var items = document.getElementById('items');
        checkList.getElementsByClassName('anchor')[0].onclick = function (evt) {
            if (items.classList.contains('visible')){
                items.classList.remove('visible');
                items.style.display = "none";
            }
            
            else{
                items.classList.add('visible');
                items.style.display = "block";
            }
            
            
        }

        items.onblur = function(evt) {
            items.classList.remove('visible');
        }
        
 if($('.apple').is(':checked')){
 	alert('I WAS CLIKED')
 }