Check box for Excel Online

Hi! I'm excited to share some great news - the Checkbox is not only supported in Excel Online, but its API is also supported in the latest Excel Requirement Set 1.18!

You can now add and manage the in-cell checkbox with the following APIs:

• Excel.Range.Control​
• Excel.Range.ClearOrResetContents()​
• Excel.RangeAreas.ClearOrResetContents()​

Please check out the details here: 
Excel Range Control
Excel JS API 1.18

Below is a sample code snippet that demonstrates how you can set a checkbox in cells:

async function run() {​
  await Excel.run(async (context) => {​
    let range = context.workbook.getSelectedRange();​
    range.control = {​
      type: "Checkbox"​
    };​
    await context.sync();​
  });​
}​

Hope this is helpful!!