// on load
$(window).on('load', function(){

    // preloader
    $('.dtr-preloader').delay(400).fadeOut(500);
    
    // portfolio        
    $('.dtr-portfolio-grid').imagesLoaded( function () {
        $('.dtr-portfolio-grid').isotope(
            {
            itemSelector: '.dtr-portfolio-item',
            masonry: {},
            });
        });
        $('.dtr-filter-nav a').on('click', function () {
            $('.dtr-filter-nav a').removeClass('active');
            $(this).addClass('active');
            var selector = $(this).attr('data-filter');
            $('.dtr-portfolio-grid').isotope({
            filter: selector
        });
        return false;
    });
    
}); // close on load