$(function () {
            var spread = new GC.Spread.Sheets.Workbook($("#ss")[0]);
            var activeSheet = spread.getActiveSheet();
            activeSheet.setRowCount(7);
            activeSheet.setValue(0, 0, "North");
            activeSheet.setValue(1, 0, "South");
            activeSheet.setValue(2, 0, "East");
            activeSheet.setValue(3, 0, "South");
            activeSheet.setValue(4, 0, "North");
            activeSheet.setValue(5, 0, "North");
            activeSheet.setValue(6, 0, "West");
            activeSheet.setColumnWidth(0, 80);

            //Set a rowFilter.
            activeSheet.rowFilter(new GC.Spread.Sheets.Filter.HideRowFilter(new GC.Spread.Sheets.Range(0, 0, 7, 1)));

            $("#button1").click(function () {
                var rowFilter = spread.getActiveSheet().rowFilter();
                //*********************************************
                //Exit if Column1 has not been filtered.
                //*********************************************
                if (!rowFilter.isFiltered(0)) {
                    return;
                }

                //*********************************************
                //Filtered strings
                //*********************************************
                var filterItems = rowFilter.getFilterItems(0);
                var str = "Filtered strings:";
                filterItems.forEach(function (item) {
                    str += " " + item.expected();
                })

                console.log(str);
                console.log("");

                //*********************************************
                //Number of Filtered-In (displayed) rows
                //*********************************************
                var range = rowFilter.range;
                var filteredInRows = [], filteredOutRows = [];
                for (var i = range.row, last = range.row + range.rowCount; i < last; i++) {
                    if (rowFilter.isRowFilteredOut(i)) {
                        filteredOutRows.push(i);
                    } else {
                        filteredInRows.push(i);
                    }
                }
                console.log("Number of Filtered-In (displayed) rows: " + filteredInRows.length);
                console.log("");

                //*********************************************
                //Number of Filtered-Out (hidden) rows
                //*********************************************
                console.log("Number of Filtered-Out (hidden) rows: " + filteredOutRows.length);
                console.log("");

                filteredOutRows.forEach(function(item){
                    console.log("Filtered-Out (hidden) row index: " + item);
                });
                console.log("");

                //*********************************************
                //Filtered-In (displayed)/Filtered-Out (hidden) rows
                //*********************************************
                filteredOutRows.forEach(function(item){
                    console.log("Data of Filtered-Out (hidden) row: " + activeSheet.getValue(item, 0));
                });
                console.log("");
                filteredInRows.forEach(function(item){
                    console.log("Data of Filtered-In (displayed) row: " + activeSheet.getValue(item, 0));
                });
            });         
        })