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<!DOCTYPE html>
<html>
<body>
​
<select size="6">
  <option value="BMW">BMW</option>
  <option value="Mercedes">Mercedes</option>
  <optgroup id="myOptgroup" label="Swedish Cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="koenigsegg">Koenigsegg</option>
  </optgroup>
</select>
​
<p>Click the button to disable some options in the dropdown list.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  document.getElementById("myOptgroup").disabled = true;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_optgroup_disabled2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:47 GMT -->
</html>
​
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