Live Demo: Executing a Function on Change Event in jQuery

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Executing a Function on Change Event in jQuery</title>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
$(document).ready(function(){
    $("select").change(function(){
        var selectedOption = $(this).find(":selected").val();
        alert("You have selected - " + selectedOption);
    });
});
</script>
</head>
<body>
    <form>
        <label>City:</label>
        <select>
            <option>London</option>
            <option>Paris</option>
            <option>New York</option>
        </select>
    </form>
    <p><strong>Note:</strong> Select any value from the dropdown select and see the result.</p>
</body>
</html>