JSFiddle - React, Tailwind, and code Playground

HTML

<select name="data" class="autotime" id="EventStartTimeMin">
    <option value=""></option>
    <option value="00">00</option>
    <option value="10">10</option>
    <option value="20">20</option>
    <option value="30">30</option>
    <option value="40">40</option>
    <option value="50">50</option>
</select>

JavaScript

$('#EventStartTimeMin').change(function() {
    if($(this).val()===""){ 
        console.log('empty');    
    }
});