helloris

<form>
    <fieldset disabled>
        <input/>
        <input/>
        <input/>
    </fieldset>
</form>

document.querySelectorAll('form input, form select, form textarea, form button')
  .forEach(elem => elem.setAttribute("disabled", "disabled"));

$( "body" ).on( "click", " #table > tbody > tr", function() {
      $.post("file.php",
       {Order: $(this).find("td").eq(2).text()},
        function() . . .