JSFiddle - React, Tailwind, and code Playground

HTML

<form name="dofilter" method="post" action="<%=site_url%>/product">
    <select name="ff">
        <option value="">--</option>
        <option id="filer-one" value="brut">brut</option>
        <option id="filer-two" value="Moet">Moet</option>
    </select>
</form>

JavaScript

$("form > select").change(function () {
    $(this).parent().attr("name", $(this).find("option:selected").attr("id"));
});