JSFiddle - React, Tailwind, and code Playground
HTML
<select>
<option value="" selected>Select an option...</option>
<option value="1">My first option</option>
<option value="2">My second option</option>
<option value="3">My third option</option>
</select>
JavaScript
document.querySelector( 'select' ).addEventListener( 'change' , function () {
// do something with the value
console.log(this.value);
} );