var categorySelect = $('#category_select');
        var productSelect = $('#product_select');
        categorySelect.select2();
        productSelect.select2();
        categorySelect.on('change',function () {
            var categoryId = $(this).val();
            var url = "{{url("/ajax/category/:category/products")}}";
            url = url.replace(":category",categoryId);
            $.get(url,function (res) {
                var res = [
                    {id: 900, text: 'AABB'},
                    {id: 800, text: 'WWBB'},
                ]; // dummy response
                productSelect.select2('data',res);
            })
        })