@url: https://forum.nette.org/cs/26907-addcondition-a-addconditionon

lambda.php

<?php

->addCondition(function() use ($form) {
    return ...; //true nebo false
})

retezeni.php

<?php

1) 
$videoLength = $video->addText('videoLength', 'Délka videa');
$videoLength->addConditionOn($form['article-published'], Form::EQUAL, TRUE)
    ->setRequired();
$videoLength->addCondition(Form::FILLED)
    ->addRule(Form::PATTERN
    
    


2)
$video->addText('videoLength', 'Délka videa')
    ->addConditionOn($form['article-published'], Form::EQUAL, TRUE)
    ->setRequired()
    ->endCondition()
    ->addCondition(Form::FILLED)
    ->addRule(Form::PATTERN, 'Délka musí být zadána ve formátu minuty:sekundy', '[0-9]+:[0-9]{2}');