Allow calling a callback in a filter when value is empty

[mbn18]

I think it might be useful to be able to call a callback when value is absent

Something like this:

$this->add($factory->createInput(array(
    'name'          => 'var_id',
    'callback_if_empty'   => array(
        'callback'      => array($model, 'getValue'),
        'messages'   => array(
            'callbackValue'  => "What ever",
        ),
    ),
)));

[ralphschindler]

Can you provide a pull request for this feature request?

[samsonasik]

ping @mbn18

[mbn18]

@ralphschindler , is this feature still needed?

[weierophinney]

Closing due to inactivity, and uncertainty exactly which component this actually targets.