I wanted to validate that a user has chosen a value from a combo box where the value is of type Guid. First I implemented a JavaScript function which tests whether a given value represent a valid Guid ...

The Excel JavaScript Library provides APIs to enable your add-in to add automatic data validation to tables, columns, rows, and other ranges in a workbook. To understand the concepts and the ...

The add-in bar does not appear when a message is selected. If this occurs, restart the add-in by selecting Debug - Stop Debugging in the Visual Studio window, then press F5 to rebuild and deploy the ...