Spread.Sheets Documentation
Creating Custom Formulas
Spread.Sheets Documentation > Developer's Guide > Managing the User Interface > Using Formulas > Creating Custom Formulas

If you have functions that you use on a regular basis that are not in the built-in functions or if you wish to combine some of the built-in functions into a single function, you can do so by defining your own custom functions. They can be called as you would call any of the built-in functions.

Using Code

This example creates a custom function.

JavaScript
Copy Code
var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
var activeSheet = spread.getActiveSheet();
// Add Custom function
// Type =myfunc(1)
// in a cell to see the result
function myfunc() {}
myfunc.prototype = new GC.Spread.CalcEngine.Functions.Function("myfunc", 0, 0, {name: "myfunc",description: "This is my first function"});
myfunc.prototype.evaluate = function (args) {
    return 100;
spread.addCustomFunction(new myfunc());