choice

Validates that the number of selected checkboxes in a group is within a specified range.

Options

Option	Type	Default	Description
min	number	undefined	Minimum number of checkboxes that must be checked
max	number	undefined	Maximum number of checkboxes that can be checked
message	string	locale default	Custom error message

Playground

Valid values

Value	Notes
2 checkboxes checked	Within min=1, max=3
1 checkbox checked	Equal to min

Invalid values

Value	Reason
0 checkboxes checked	Below min=1
4 checkboxes checked	Exceeds max=3

Notes

• If no checkboxes are checked, choice counts 0 selected items. Set min: 1 or higher to require at least one selection.
• Do not combine with notEmpty — it checks string values, not checkbox state.
• Applies to groups of checkboxes sharing the same name attribute.