Ubuntu Manpage: HTML::FormFu::Constraint::CallbackOnce

SYNOPSIS

    $form->constraint({
        type => 'CallbackOnce',
        name => 'foo',
        callback => \&sfoo,
    );
    sub foo {
        my ( $value, $params ) = @_;
        # return true or false
    }

DESCRIPTION

Unlinke the HTML::FormFu::Constraint::Callback, this callback is only called once, regardless of how many values are submitted.

The first argument passed to the callback is the submitted value for the associated field; this may be a single value or an arrayref of value. The second argument passed to the callback is a hashref of name/value pairs for all input fields.

This constraint doesn't honour the not() value.