JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test1" class="test">Test 1</div>
<div id="test2" class="test">Test 2</div>

CSS

.test{
    height: 80px;
    width: 80px;
    background: #000;
    padding: 20px;
    margin: 20px;
    color: #eee;
}

JavaScript

var current_button;
$('.test').on('mousedown', function(){
    current_button = this.id;
});
$(document).on('mouseup', function(){
    alert(current_button);
});