Backpack custom btn error

@if ($crud->hasAccess('update'))
<a href="javascript:void(0)" onclick="updateEntry(this)"
    data-route="{{ url($crud->route.'/'.$entry->getKey().'/markasread') }}" class="btn btn-sm btn-link"
    data-button-type="update"><i class="la la-book"></i> Mark as {{$entry->is_read == '1' ? 'unread' : 'read'}}</a>
@endif

{{-- Button Javascript --}}
{{-- - used right away in AJAX operations (ex: List) --}}
{{-- - pushed to the end of the page, after jQuery is loaded, for non-AJAX operations (ex: Show) --}}
@push('after_scripts') @if (request()->ajax()) @endpush @endif
<script>
    console.log(this);
    if (typeof updateEntry != 'function') {
      $("[data-button-type=update]").unbind('click');
        function updateEntry(button) {
            // ask for confirmation before deleting an item
            // e.preventDefault();
            var route = $(button).attr('data-route');
                $.ajax({
                    url: route,
                    type: 'POST',
                    dataType: "json",
                    data: [
                    {
                    "id": {{$entry->getKey()}}
                    }
                    ],
                    success: function(result) {
                    // Show an alert with the result
                    console.log(result,route);
                        new Noty({
                            text: {{$entry->is_read == '1' ? 'Marked as unread' : 'Marked as read'}},
                            type: "success"
                        }).show();

                    // Hide the modal, if any
                    $('.modal').modal('hide');

                    crud.table.ajax.reload();
                },
                error: function(result) {
                        // Show an alert with the result
                        new Noty({
                            text: "Error",
                            type: "warning"
                        }).show();
                    }
                });
      }
    }
    // make it so that the function above is run after each DataTable draw event
    // crud.addFunctionToDataTablesDrawEventQueue('deleteEntry');
</script>
@if (!request()->ajax()) @endpush @endif