Why addEventListener to 'select' element does not work in JavaScript?

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

Instead, use querySelector() along with addEventListener().

Example

Following is the code −

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=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>
<body>
   <select id="selectDemo">
      <option value="Java">Java</option>
      <option value="Javascript">Javascript</option>
      <option value="MySQL">MySQL</option>
      <option value="MongoDB">MongoDB</option>
   </select>
</body>
<script>
   document.querySelector('#selectDemo').addEventListener('change', subjectMarks);
   function subjectMarks() {
      console.log(58);
   }
</script>
</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.

This will produce the following output −

Now, select the value from dropdown list −

Output

This will produce the following output −

raja
Published on 26-Oct-2020 15:11:06
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