You can create your own function by inheriting the GC.Spread.CalcEngine.Functions.Function, as shown in the following code: The evaluate function can return a GC.Spread.CalcEngine.CalcArray object to represent the custom function returns an array as following code: After you have added your own function, if you want to remove it or clear all custom functions, use the removeCustomFunction or clearCustomFunctions method.
window.onload = function () { var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"), { sheetCount: 2 }); initSpread(spread); }; function initSpread(spread) { spread.options.allowDynamicArray = true; var sheet = spread.getSheet(0); sheet.setValue(1, 1, 'Press \'Add a Custom Function\' button'); sheet.setColumnWidth(1, 225); sheet.setColumnWidth(2, 100); function FactorialFunction() { this.name = "FACTORIAL"; this.maxArgs = 1; this.minArgs = 1; } FactorialFunction.prototype = new GC.Spread.CalcEngine.Functions.Function(); FactorialFunction.prototype.evaluate = function (arg) { var result = 1; if (arguments.length === 1 && !isNaN(parseInt(arg))) { for (var i = 1; i <= arg; i++) { result = i * result; } return result; } return "#VALUE!"; }; var factorial = new FactorialFunction(); function FactorialArrayFunction() { this.name = "FACTORIAL.ARRAY"; this.maxArgs = 1; this.minArgs = 1; } FactorialArrayFunction.prototype = new GC.Spread.CalcEngine.Functions.Function(); FactorialArrayFunction.prototype.evaluate = function (arg) { var t = 1; var result = [[]]; if (arguments.length === 1 && !isNaN(parseInt(arg))) { for (var i = 1; i <= arg; i++) { t = i * t; result[0].push(t); } return new GC.Spread.CalcEngine.CalcArray(result); } return "#VALUE!"; }; var factorialArray = new FactorialArrayFunction(); document.getElementById("addCustomFunction").addEventListener('click',function() { sheet.setValue(3, 1, 'Formula'); sheet.setValue(3, 2, '=FACTORIAL(5)'); sheet.setValue(4, 1, 'Result'); sheet.addCustomFunction(factorial); sheet.setFormula(4, 2, "=factorial(5)"); sheet.setValue(6, 1, 'Formula'); sheet.setValue(6, 2, '=FACTORIAL.ARRAY(5)'); sheet.setValue(7, 1, 'Result'); sheet.addCustomFunction(factorialArray); sheet.setFormula(7, 2, "=FACTORIAL.ARRAY(5)"); }); document.getElementById("removeCustomFunction").addEventListener('click',function() { sheet.removeCustomFunction("FACTORIAL"); sheet.removeCustomFunction("FACTORIAL.ARRAY"); sheet.recalcAll(true); }); };
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