JSFiddle - React, Tailwind, and code Playground
HTML
<select id="selectarea" name="sometext" size="10" >
<option val=1>One</option>
<option val=2>Two</option>
<option val=3>Three</option>
<option val=4>Four</option>
</select>
JavaScript
var s=document.getElementById('selectarea');
s.onchange=function(e){
console.log(e.target.value)
}