To get the count of options in a dropdown list, use the length property in JavaScript.
Example
You can try to run the following code to find the number of options in the drop-down −
<!DOCTYPE html> <html> <body> <form id="myForm"> <select id="mySelect"> <option>One</option> <option>Two</option> <option>Three</option> </select> </form> <script> var val = document.getElementById("mySelect").length; document.write("<br>Options in the DropDown list: "+val); </script> </body> </html>