JSFiddle - React, Tailwind, and code Playground

HTML

<select id="mySelect" onChange="showMyVal(this)">
    
    <option value="1">1</option>
        <option value="2">2</option>   
    <option value="3">3</option>
</select>

JavaScript

function showMyVal(obj) {
 console.log(obj);  
}