getting multiple images when scrolling down a page

Question

I am using this code for scrolling to get the images but when I am scrolling down multiple images are displayed.

Please can anyone rectify issues, may be problem with if condition.

Excel::filter('chunk')->load(storage_path('excel/exports/').$fileName)->chunk(1000, function($results)
    {
        foreach($results as $key)
        {
            // even nothing to do
        }
    });