SYNOPSIS

my $c = $widget->constraint( 'CallbackOnce', 'foo', 'bar' )->callback(
sub {
my ($foo, $bar) = @_;
return 1 if $foo == $bar * 2;
});

DESCRIPTION

A callback constraint which will only be run once for each call of ``process'' in HTML::Widget.

METHODS

callback

cb

Arguments: \&callback

Requires a subroutine reference used for validation, which will be passed a list of values corresponding to the constraint names.

``cb'' is provided as an alias to ``callback''.

process

Overrides ``process'' in HTML::Widget::Constraint to ensure ``validate'' is only called once for each call of ``validate''.

render_errors

Arguments: @names

A list of element names for which an error should be displayed.

If this is not set, the default behaviour is for the error to be displayed for all of the Constraint's named elements.

validate

perform the actual validation.

AUTHOR

Carl Franks "[email protected]"

LICENSE

This library is free software, you can redistribute it and/or modify it under the same terms as Perl itself.