JSFiddle - React, Tailwind, and code Playground

HTML

<select name = 'region' id = 'region'>
  <option value = '1'>Region 1</option>
    <option value = '2'>Region 2</option>
<select>

JavaScript

var select = document.getElementById('region');
if(select.addEventListener) {
    select.addEventListener('change', function(evt) {     
        var target = evt.target || evt.srcElement;
        var selected = target[target.selectedIndex];
        var text = selected.textContent || selected.innerText;
        alert(text);
    });
 }
else if(select.attachEvent) {
  select.attachEvent('onchange', function(evt) {
        var target = evt.target || evt.srcElement;
        var selected = target[target.selectedIndex];
        var text = selected.textContent || selected.innerText;
        alert(text);
    });
}