Codeigniter / jQuery：将选择下拉列表中的值提取到数据表中时出现问题

I have a dropdown box which is fetching values from the database and a button, when the button is clicked the product in the dropdown box should display the product's details in the datatable. As of now when I click on the button to add the product into the datatable, nothing happens. I will post my code for MVC and the jQuery.I have a dropdown box which is fetching values