[html-formfu] custom element with automatic constraint

[Carl Franks]

On 26/02/2008, Steve Caldwell <info-formfu at caldwellhb.com> wrote:
> All,
>
>  Because I have so many instances of this in my code:
>
>   - type: Select
>     ...
>     constraints:
>       - type: AutoSet
>
>
>  I wanted to create a custom class that inherits from Element::Select and
>  automatically includes AutoSet as a constraint.  After poking around at
>  the documentation/code for a little bit, it's not immediately obvious to
>  me how to do this.  Has anyone tried this before, or have any advice on
>  where I could look?

I believe this should work (untested):

package MySelect;
use strict;
use base 'HTML::FormFu::Element::Select';
use Class::C3;

sub process {
    my $self = shift;

    $self->constraint('AutoSet')
        unless $self->get_constraint({ type => 'AutoSet' });

    return $self->next::method(@_);
}


    ---
    element:
      - type: '+MySelect'

The '+' prefix is because it isn't within the HTML::FormFu::Element::*
namespace.

Carl