$()$()$()$()

HTML

<select id="dropDown">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

JavaScript

$(document).ready(function(){

$("#dropDown").prop("disabled", true);
    
});