Child Elements

<!DOCTYPE html>
<html>
<body>

<p>Click the button to get the text of the third child node (index 2) of the select element.</p>

<select id="mySelect" size="4"><option>Audi</option><option>BMW</option><option>Saab</option><option>Volvo</option></select><br><br>

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

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

<script>
function myFunction() {
  var c = document.getElementById("mySelect").childNodes;
  document.getElementById("demo").innerHTML = c[0].text;
}
</script>

</body>
</html>