JSFiddle - React, Tailwind, and code Playground

HTML

<select id="some_id">
    <option>1</option>
    <option>2</option>
    <option>3</option>
</select>

JavaScript

$(function(){
    var current_value = null;
    $('#some_id').change(function(){
        current_value = $(this).val();//storing
        alert(current_value);
    });
});