Ajax with Combination in prestashop

$(function() {
    $(document).on('change', '.product-variants [data-product-attribute]', function (event) {
        var query = $(event.target.form).serialize() + '&ajax=1&action=productrefresh';
        var actionURL = $(event.target.form).attr('action');
        $.post(actionURL, query, null, 'json').then(function (resp) {
            var productUrl = resp.productUrl;
            $.post(productUrl, {ajax: '1',action: 'refresh' }, null, 'json').then(function (resp) {
                var idProductAttribute = resp.id_product_attribute;

                // your own code to perform some action on combination change
                //
                //

            });
        });
    });

Get an action when you change product combination on product page