The Excel Services REST and SOAP APIs introduced in SharePoint 2010 are SharePoint only, but with the Excel Services JavaScript API you can work with embedded workbooks on a host web page — from ...

Enabling JavaScript should make Excel more powerful, but increasing access points makes it even more of a web security nightmare than it already is.

Custom JavaScript functions work by creating three files and storing them on an accessible web server. These files are a JS file containing the custom equation, a html file that loads your ...