How to identify the Excel Sheet changed event in office js api?

Question

We have an Excel office js add-in written on angular. It has different functionalities based on the sheet the user is in. When users switch the sheets of excel, how can the

Answer 1

You can add handler for context.workbook.worksheets.onActivated

Excel.run((context) => {
  context.workbook.worksheets.onActivated.add(({ worksheetId }) => {
    console.log('Selected worksheet', worksheetId)
  })

  return context.sync()
    .then(function () {
        console.log("Event handler successfully registered");
    });
}).catch(errorHandlerFunction);

More info here