JSFiddle - React, Tailwind, and code Playground

HTML

<select id="afewitems" onchange="changeInfo(this)">
    <option value="0">Select</option>
    <option value="1">item1</option>
    <option value="2">item2</option>
</select>
<div id="info"></div>

JavaScript

function changeInfo(el) {
    var info = [ 
        "some text",       // option 0
        "something else",  // option 1
        "..."              // option 2
    ];
    var val = el.options[el.selectedIndex].value;
    document.getElementById('info').innerHTML = info[val];
}
changeInfo(document.getElementById('afewitems'));