JSFiddle - React, Tailwind, and code Playground

HTML

<select id="typeofworkday">
   <option value="lavorato" id="lavorato" name="lavorato"> lavorato </option>
   <option value="ferie" id="ferie" name="ferie"> ferie </option>
   <option value="malattia" id="malattia" name="malattia"> malattia </option>
</select>

<input type="checkbox" name="permesso" id="check1" onclick="check();"> Permesso

JavaScript

$("#typeofworkday").on("change", function() {
    if ($(this).val() === "ferie") {
        $("#check1").attr("disabled", "disabled");
    } else {
        $("#check1").removeAttr("disabled");
    }
});