Rose::HTML::Form::Field::DateTime::Split::MDYHMS - Compound field for dates with separate text fields for month, day, year, hour, minute, and second, and a pop-up menu for AM/PM.
$field = Rose::HTML::Form::Field::DateTime::Split::MDYHMS->new( label => 'When', name => 'when', default => '12/31/2002 6:30 p.m.'); print $field->field('time.minute')->internal_value; # "30" print $field->field('date.day')->internal_value; # "31" print $field->internal_value; # "2002-12-31T18:30:00" print $field->output_value; # "12/31/2002 06:30:00 PM" $field->input_value('blah'); # "Could not parse date: blah" $field->validate or warn $field->error; $field->input_value('4/30/1980 1:23pm'); $dt = $field->internal_value; # DateTime object print $dt->hour; # 13 print $dt->day_name; # Wednesday print $field->html; ...
Rose::HTML::Form::Field::DateTime::Split::MDYHMS is a compound field for dates with separate text fields for month, day, year, hour, minute, and second, and a pop-up menu for AM/PM.
This class inherits (indirectly) from both Rose::HTML::Form::Field::DateTime and Rose::HTML::Form::Field::Compound. This doesn't quite work out as expected without a bit of tweaking. We'd like inflate_value() and validate() methods to be inherited from Rose::HTML::Form::Field::DateTime, but everything else to be inherited from Rose::HTML::Form::Field::Compound.
To solve this problem, there's an intermediate class that imports the correct set of methods. This class then inherits from the intermediate class. This works, and isolates the tricky bits to a single intermediate class, but it also demonstrates the problems that can crop up when multiple inheritance is combined with a strong aversion to code duplication.
Inheritance shenanigans aside, this class is a good example of a compound field that includes other compound fields and also provides an "inflated" internal value (a DateTime object). This is the most complex custom field example in this distribution. It does everything: nested compound fields, validation, inflate/deflate, and coalesce/decompose.
The date portion of the field is handled by a Rose::HTML::Form::Field::DateTime::Split::MonthDayYear field, and the time portion is handled by a Rose::HTML::Form::Field::Time::Split::HourMinuteSecond field.
Get or set the date parser object. This object must include a
parse_datetime() method that takes a single string as an argument and returns a DateTime object, or undef if parsing fails.
If the parser object has an
error() method, it will be called to set the error message after a failed parsing attempt.
The parser object defaults to Rose::DateTime::Parser->new().
If the parser object has a time_zone() method, this method simply calls it, passing all arguments. Otherwise, undef is returned.
Other examples of custom fields:
A text field that only accepts valid email addresses.
Uses inflate/deflate to coerce input into a fixed format.
Uses inflate/deflate to convert input to a DateTime object.
A compound field whose internal value consists of more than one object.
A simple compound field that coalesces multiple subfields into a single value.
A compound field that uses inflate/deflate convert input from multiple subfields into a DateTime object.
John C. Siracusa (email@example.com)
Copyright (c) 2010 by John C. Siracusa. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.