$('#pizza_kind').prop('disabled', false); and $('#pizza_kind').prop('disabled', true);.As jQuery's documentation says: Properties generally affect the dynamic state of a DOM element without changing the serialized HTML attribute. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Whether you're building highly interactive web applications or you just need to add a date picker to a form control, jQuery UI is the perfect choice. If you're looking for explanations of the basics, workarounds for common problems, best practices, and how-tos, you're in the right place! The jQuery Select Option is to control the multiple attributes and content for the user input information. It is a special attribute used mostly in the dropdown list. val() returns the value of the