JSFiddle - React, Tailwind, and code Playground

HTML

<select name="sweets" id="select">
  <option>Chocolate</option>
  <option>Candy</option>
  <option>Taffy</option>
  <option>Caramel</option>
  <option>Fudge</option>
  <option>Cookie</option>
</select>
<div id="toclear">Texte qui va s'effacer si tu change</div>

JavaScript

var select = document.getElementById("select");
var toclear = document.getElementById("toclear");
select.addEventListener("change", function() {
    toclear.innerHTML = "";
});