isotope infinite load

isotope infinite load.js

jQuery(document).ready(function() {
      jQuery(function(){
        var $grid = jQuery(".isotope");
        $grid.isotope();
        
          jQuery(window).trigger('resize');
        console.log('triggered resize');
        
        var count = 2;
        var total = 251;
        var top_of_element = jQuery("#ajax_loader").offset().top - 1500;
        var bottom_of_element = jQuery("#ajax_loader").offset().top + jQuery("#ajax_loader").outerHeight();
        var is_loading = 0;
        
        loadgriditems();
        // console.log('load grid items first time');
        jQuery(window).scroll( function() {
          if (is_loading == 0) {
            loadgriditems();
          }
          
        });
        
        function loadgriditems() {
          
          
          var bottom_of_screen = jQuery(window).scrollTop() + jQuery(window).height();
          var top_of_screen = jQuery(window).scrollTop();
          
          if((bottom_of_screen > top_of_element) && is_loading == 0){ // && (top_of_screen < bottom_of_element) 
            
            // console.log('a');
            
            if (count > total){
                return false;
            }else{
              // console.log('b');
              is_loading = 1;
              console.log('grid is loading');
              jQuery('#ajax_loader').addClass('loading');
              
              var postdata = {
                'action': 'infinite_scroll',
                'page_no': count
              };
              
              jQuery.ajax({
                  url: "http://fishingtackleretailer.com/wp-admin/admin-ajax.php",
                  type:'POST',
                  data: postdata, 
                  success: function(html){
                    // console.log('c');
                    var $items = jQuery(html);
                    $grid.isotope( 'insert', $items );    // This will be the div where our content will be loaded
                    
                    
                    $items.imagesLoaded().progress( function() {
                      
                      $grid.isotope('reLayout');
                      $grid.isotope();
                      console.log('triggered again on success');
                    // console.log('added');
                      $grid.isotope('reloadItems');
                      // jQuery(".isotope").on( 'arrangeComplete', function( event, filteredItems ) {
                        console.log('arrangeComplete');
                        
                        jQuery('#ajax_loader').removeClass('loading');
                        top_of_element = jQuery("#ajax_loader").offset().top - 1500;
                        bottom_of_element = jQuery("#ajax_loader").offset().top + jQuery("#ajax_loader").outerHeight();
                      // });
                        
                        
                    });
                    
                        console.log('count: '+ count);
                        count++;
                        
                        jQuery(window).trigger('resize');
                        
                        setTimeout(function () {
                          is_loading = 0;
      
                        }, 500);
                    
                    
                    
                  }
              });
              
            }
          }
          
        }
      
      });
    
    });