JSFiddle - React, Tailwind, and code Playground

HTML

<select id="test-dropdown" onchange="choice1(this)">
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>

JavaScript

function choice1(select) {
    alert(select.options[select.selectedIndex].text);
}