JavaScript get the length of select options(dropdown)?

Javascript Web Development Object Oriented Programming

Let’s say the following is our dropdown (select) −

<select id="lengthListOfOptionDemo">
   <option>John</option>
   <option>Mike</option>
   <option>Sam</option>
   <option>David</option>
   <option>Carol</option>
</select>

Following is the code to get the length of list options in JavaScript −

Example

Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initialscale=
1.0">
<title>Document</title>
</head>
<link rel="stylesheet"
href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/fontawesome/
4.7.0/css/font-awesome.min.css">
<style>
</style>
<body>
<select id="lengthListOfOptionDemo">
<option>John</option>
<option>Mike</option>
<option>Sam</option>
<option>David</option>
<option>Carol</option>
</select>
<script>
   var lengthOfListOptions = $("#lengthListOfOptionDemo option").length;
   console.log("The length is=" + lengthOfListOptions);
</script>
</body>
</html>

To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.