Explanation
Data Validation can display instructions when a user selects a cell.
Input Message
Example:
Title: Enter Age
Message: Please enter an age between 18 and 60.
Error Alert
Excel can display an error when invalid data is entered.
Three main styles:
- Stop — prevents invalid entry
- Warning — warns the user
- Information — provides information
Example
For Age:
Allow: Whole Number
Between: 18 and 60
Error Alert: Stop
If someone enters 75, Excel displays an error message.
Practice
Create input messages and error alerts for:
- Age
- Department
- Salary
- Joining Date