laravel load more button ajax

With @Shan help, i found the problem.

First i fixed my js in the footer on this one:

<script type="text/javascript">
    var pageNumber = 2;

    $(document).ready(function() {
            $.ajax({
                type : 'GET',
                url: "websiteURL/posts?page=" +pageNumber,
                success : function(data){
                    pageNumber +=1;
                        if(data.length == 0){
                        }else{
                            $('#grid').append(data.html);
                        }
                },error: function(data){

                },
            })  
    });

    $(window).scroll(function() {
        if($(window).scrollTop() + $(window).height() >= $(document).height()) {
            $.ajax({
                type : 'GET',
                url: "websiteURL/posts?page=" +pageNumber,
                success : function(data){
                    pageNumber +=1;
                        if(data.length == 0){
                        }else{
                            $('#grid').append(data.html);
                        }
                },error: function(data){

                },
            })  
        }
    });

    function loadMoreData(){
            $.ajax({
                type : 'GET',
                url: "http://communitune.com/posts?page=" +pageNumber,
                success : function(data){
                    pageNumber +=1;
                        if(data.length == 0){
                            // :( no more articles
                        }else{
                            $('#grid').append(data.html);
                        }
                },error: function(data){

                },
            })  
    }
</script>
And then i put fixed controller also into

 public function index(Request $request)
    {
        $posts = Post::orderBy('created_at', 'desc')->paginate(8);
        //$posts = Post::orderBy('created_at', 'desc')->limit(8)->get();
        $categories = Category::all();

       if ($request->ajax()) {
           $view = view('posts.load', compact('posts', 'categories'))->render();
           return response()->json(['html'=>$view]);
       }

        return view('posts.display', compact('categories', 'posts'));
    }
The credits goes to @Shan, in the comment who helped me to solve this.