$(document).ready(function(){
            $(this).on('click', '#all_items .pagination a', function(e){
                e.preventDefault();
                var page = $(this).attr('href').split('page=')[1];

                var subcategory_id = '';

                if(category_id != ''){
                    var pageUrl = 'ajax/category/item/' + category_id +'?page=' + page;
                }
                else if(subcategory_id != ''){

                }
                else{
                    var pageUrl = 'ajax/item?page=' + page;
                }

                $.ajax({
                    url: pageUrl,
                    beforeSend: function(){
                        wrap_loading.slideDown();
                    },
                    success: function(data){
                        all_items.html(data);
                        wrap_loading.slideUp();
                    }
                });

            });

    });

var pageUrl = 'ajax/category/item/' + category_id +'?page=' + page;

Route::get('ajax/item/', 'AjaxController@Item'); //Works very well
Route::get('ajax/category/item/{category_id}/', 'AjaxController@categoryItem');

public function Item(){

    $items = Item::orderBy('name', 'asc')->paginate(4);
    return view('items.paginate')->with('items', $items)->render();
}

public function categoryItem($category_id){

    $items = Category::find($category_id)->items()
    ->orderBy('items.name')
    ->paginate(2);

    return view('items.paginate_category_item')->with('items', $items)->render();
}