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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 ['Fixed list', 'small']
sheet.add_row ['Dynamic list', 'red']
sheet.add_row ['No dropdown', 'north']
sheet.add_row
sheet.add_row ['Allowed values in B2 (dynamic list):', 'red', 'orange', 'navy blue']
sheet.add_data_validation('B1:B1',
type: :list,
formula1: '"small, medium, large"',
showErrorMessage: true,
errorTitle: '',
error: 'Allowed values: small, medium, large',
errorStyle: :stop,
showInputMessage: true,
promptTitle: '',
prompt: 'Choose a size:')
sheet.add_data_validation('B2:B2',
type: :list,
formula1: 'B5:D5',
showErrorMessage: true,
errorTitle: '',
error: 'Only values from B5:D5 allowed!',
errorStyle: :stop,
showInputMessage: true,
prompt: 'Choose a color (from list in B5:D5):')
sheet.add_data_validation('B3:B3',
type: :list,
formula1: '"north, east, south, west"',
hideDropDown: true,
showErrorMessage: true,
errorTitle: '',
error: 'Allowed values: north, east, south, west',
errorStyle: :stop,
showInputMessage: true,
prompt: 'Enter a direction:')
end
p.serialize 'list_validation_example.xlsx'
```
## Output
Validating with dropdown:
Validating without dropdown:
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