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## Description
You could validate data based on an explicit list or a given range of cells.
## Code
```ruby
require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
wb.add_worksheet(name: 'Basic Worksheet') do |sheet|
sheet.add_row ['First', 'Second', 'Third']
sheet.add_row [1, 6, 11]
sheet.add_data_validation('A2:A2',
type: :list,
formula1: 'A1:C1',
showDropDown: false,
showErrorMessage: true,
errorTitle: '',
error: 'Only values from A1:C1',
errorStyle: :stop,
showInputMessage: true,
promptTitle: '',
prompt: 'Only values from A1:C1')
sheet.add_data_validation('B2:B2',
type: :list,
formula1: '"Red, Orange, NavyBlue"',
showDropDown: false,
showErrorMessage: true,
errorTitle: '',
error: 'Please use the dropdown selector to choose the value',
errorStyle: :stop,
showInputMessage: true,
prompt: 'Choose the value from the dropdown')
end
p.serialize 'list_validation_example.xlsx'
```
## Output
Validating by cells:
Validating by list:
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