The code in the task pane add-in for Excel demonstrates how to build a simple user interface that saves data to cross-session web browser storage (localStorage). It also demonstrates how to detect ...

The add-in stores data as key/value pairs, using the JavaScript API for Office property bag, browser cookies, web storage (localStorage and sessionStorage), or by storing the data in a hidden div in ...

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 ...

At the Build 2018 developer conference that's taking place these days in Seattle, USA, Microsoft announced support for custom JavaScript functions in Excel.