JSFiddle - React, Tailwind, and code Playground

HTML

<select id="comboA">
    <option value="">Select combo</option>
    <option value="Value1">Text1</option>
    <option value="Value2">Text2</option>
    <option value="Value3">Text3</option>
</select>
To test, change the value

JavaScript

document.getElementById('comboA').addEventListener('change', function() {
    foo('bar');
}, false);

function foo(message) {
    alert(message);
}