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<!DOCTYPE html>
<html>
<body>

<h3>A demonstration of how to access a SELECT element</h3>

<select id="mySelect" size="4">
  <option>Apple</option>
  <option>Pear</option>
  <option>Banana</option>
  <option>Orange</option>
</select>

<p>Click the button to get the number of option elements found in a drop-down list.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("mySelect").length;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>