debian man page for html::widget::constraint::callbackonce

HTML::Widget::Constraint::CallbackOnce(3pm)		User Contributed Perl Documentation	       HTML::Widget::Constraint::CallbackOnce(3pm)

NAME
       HTML::Widget::Constraint::CallbackOnce - CallbackOnce Constraint

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 "cfranks@cpan.org"

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

perl v5.10.1							    2007-03-01			       HTML::Widget::Constraint::CallbackOnce(3pm)