<!DOCTYPE html>
<html>
<body>

Select your favorite fruit:
<select id="mySelect">
  <option>Apple</option>
  <option>Orange</option>
  <option>Pineapple</option>
  <option>Banana</option>
</select>

<p>Click the button to display the text of all options in the dropdown list.</p>

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

<script>
function myFunction() {
    var x = document.getElementById("mySelect");
    var txt = "All options: ";
    var i;
    for (i = 0; i < x.length; i++) {
        txt = txt + "\n" + x.options[i].text;
    }
    
alert(txt);
}
</script>

</body>
</html>