JavaScript runtime error: ‘Excel’ is undefined

This blog shows you the cause of the error “JavaScript runtime error: ‘Excel’ is undefined”. There is a solution but might not resolving your problem.

When I run my Add-ins in Office 2013 Excel then I got the error “JavaScript runtime error: ‘Excel’ is undefined”.

I run the same code in Office 365 Excel then turn out to be fine.

Below is exactly the same code I am running for both Excel versions. (ctx) {

    // Create a proxy object for the active sheet

    var sheet = ctx.workbook.worksheets.getActiveWorksheet();

    // Queue a command to write the sample data to the worksheet

    sheet.getRange(“B3:D5”).values = values;

    // Run the queued-up commands, and return a promise to indicate task completion

    return ctx.sync();



I hope Microsoft can make the Excel object supported by Office 2013. My reason of cannot upgrade to Office 365 is because the organization is still yet to move away from Microsoft Exchange 2007. Somehow Office 365 cannot support Exchange 2007. I do hope Microsoft can have better backward compatibilities.


About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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