JQuery - contains

underscore library included

by Amitesh Kumar

HTML

<select onchange="f(this)">
    <option value="">Select</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
</select>

JavaScript

f = function(obj) {
  var selectedOption = obj.options[obj.selectedIndex];
  selectedOption.setAttribute("disabled","disabled");
}