Отправка GET-запроса средствами jQuery

        setUrl: function () {
            var query = window.location.href.split('?');
            var section_id = $('.projects-list').attr('data-section-id');
            //var arFilterParam = "arrFilter_ff%5BSECTION_ID%5D%5B%5D";
 
            var $_GET   = $.parseParams(typeof query[1] == 'undefined' ? '' : query[1]);
 
            $_GET.arrFilter_ff_section_id = section_id;
            $_GET.set_filter = 'Y';
            $_GET.sortField = this.activeItem.attr('data-field');
            $_GET.sortDirection = this.activeItem.attr('data-direction');
            $_GET.PAGEN_1 = 1;
 
            var url = '?' + $.param($_GET);
            window.history.pushState(null, location.pathname, url);
            this.makeAjax(this.element.attr('data-href') + url);
        },

var arFilterParam = decodeURIComponent("arrFilter_ff%5BSECTION_ID%5D%5B%5D");
// arrFilter_ff[SECTION_ID][]

$_GET.arrFilter_ff = {
    SECTION_ID: [section_id]
};