One type of cell drop-down in SpreadJS is the calculator. When added to the workbook as a cell style with JavaScript code, the calculator provides users with a means to do quick calculation and have that result be displayed in the cell. The below spreadsheet shows how that works.

Drop-downs provide a developer the ability to add a drop-down menu with specific properties to cells in a workbook. These drop-down menus don't require any extra code other than simply specifying which one to use for the drop-down menu. SpreadJS has 9 different kinds of drop-downs, and this demo shows how to use the Calculator. You can use calculator drop-down with the following code :
var spreadNS = GC.Spread.Sheets; window.onload = function () { var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss")); initSpread(spread); }; function initSpread(spread) { var sheet = spread.getSheet(0); sheet.suspendPaint(); var style = new GC.Spread.Sheets.Style(); style.cellButtons = [ { imageType: GC.Spread.Sheets.ButtonImageType.dropdown, command: "openCalculator", useButtonStyle: true, } ]; sheet.setText(4, 5, "Calculator"); sheet.setStyle(5, 5, style); sheet.resumePaint(); spread.commandManager().execute({cmd:"openCalculator",row:5,col:5,sheetName:"Sheet1"}); }
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