JSFiddle - React, Tailwind, and code Playground
by Antindexer
HTML
<select id="myselect">
<option value="1">Mr</option>
<option value="2">Mrs</option>
<option value="3">Ms</option>
<option value="4">Dr</option>
<option value="5">Prof</option>
</select>
JavaScript
$('#myselect').on('change', function(){
alert($( "#myselect option:selected" ).index());
});