2.9. Errors

The gradebook is a flexible system, so that any class can be modeled using the Grader tool. Because of this, errors are not frequently thrown. Errors are given when required fields in dialog forms have not been filled out.

Figure 1: Fill out all required fields.


The spreadsheet also throws error conditions when an invalid input has been made. For example, for an input that accepts only numbers, any letters are not allowed. The spreadsheet will not let the user lose focus of the cell while there is invalid input in the cell.




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