在codeigniter中将值插入数据库时​​，需要ajax代码来更改按钮

Need the ajax code for changing the button when a value is inserted to database and it need to remain as changed until the value is removed from database

$(document).ready(function() {
    $('.btn_add_remove_cart').click(function(e){
       e.preventDefault();
       var self = $(this);
       if (self.hasClass('add-cart')){ 
          // if it's add cart button, replace add-cart class by remove-cart and change label
          self.removeClass('add-cart').addClass('remove-cart').text('Remove');
       } else {
         // it's remove cart button, do the inverse
         self.removeClass('remove-cart').addClass('add-cart').text('Add to Cart');
       }
    });

});