$('.ct-variable-carousel').on('slid.bs.carousel', function(){
    var $this = $(this);
    var $activeSlide = $this.find('.active');
    var $id = $activeSlide.attr('data-variation-id');
    var $price = $activeSlide.attr('data-regular-price');

    if($id){
        $this.parent().find('a.variable_data_button').attr('href', '/?add-to-cart=' + $id);
        $this.parent().find('span.woocommerce-Price-amount.amount').text($price);
    }
});