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<!DOCTYPE html>
<html>
<body>
​
<select id="pets" size="3">
  <option>Cat</option>
  <option>Dog</option>
  <option>Horse</option> 
</select>
​
<p>Click the button to disable the third option (index 2) in the dropdown list.</p>
​
<button onclick="myFunction()">Disable Option</button>
​
<script>
function myFunction() {
  var x = document.getElementById("pets").options[2].disabled = true;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_option_disabled2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:47:52 GMT -->
</html>
​
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