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    • August 5, 2014 at 11:04 am #2151
      Jason
      Keymaster

      Greetings!

      function validate_youtube_url($text) {
  $pattern = '/^https?:\/\/(www.)?youtu(be\.com|\.be)\/(watch\?v=)?([[:alnum:]_-]+)$/';
  return preg_match($pattern, $text);
}

piklist('field', array(
  'description' => 'Paste either the page or short url',
  'type'      => 'text',
  'field'     => 'design-video',
  'label'     => 'Video Url',
  'columns'   => 12,
  'validate'  => array(
    array(
      'type'      => 'youtube-url',
      'callback'  => 'validate_youtube_url',
      'message'   => 'Unrecognized youtube url'
    )
  )
));

      I’m attempting to validate a youtube url, but the validation never returns false. Am I misunderstanding how to use a custom callback?

      Thanks!

    • August 5, 2014 at 11:07 am #2152
      Jason
      Keymaster

      I just realized I was going about this all wrong. Oops! I have to add the validation first through the hook: https://piklist.com/user-guide/docs/piklist_validation_rules/

      I guess I’m not understanding what the callback is for, then? At what point in the validation process is the callback called and for what purpose?

    • August 5, 2014 at 12:33 pm #2154
      Steve
      Keymaster

      @jason– On the page you referred to, we have an example with the callback function.

      The filter adds the rule… the rule calls the callback.

    • August 5, 2014 at 12:36 pm #2155
      Steve
      Keymaster

      @jason– Since you’re validating with Regex, it’s even simpler:

      add_filter('piklist_validation_rules', 'validate_youtube_url', 11);
function validate_youtube_url()
{
  $validation_rules = array(
    'youtube-url' => array(
      'rule' => "/^https?:\/\/(www.)?youtu(be\.com|\.be)\/(watch\?v=)?([[:alnum:]_-]+)$/"
      ,'message' => __('Unrecognized youtube url')
    )
  );
 
  return $validation_rules;
}

      and your field:

      piklist('field', array(
  'description' => 'Paste either the page or short url',
  'type'      => 'text',
  'field'     => 'design-video',
  'label'     => 'Video Url',
  'columns'   => 12,
  'validate'  => array(
    array(
      'type'      => 'youtube-url',
    )
  )
));
    • August 5, 2014 at 4:18 pm #2164
      Jason
      Keymaster

      That’s exactly what I ended up doing. Worked great!

      I get the callback now. If it returns === true, then it’s valid; if it returns a string, that’s the error message. Might be a good idea to specify that in the docs. 😉

      This can be closed. Thanks!

    • August 5, 2014 at 4:36 pm #2166
      Steve
      Keymaster

      @jason– added to docs. Closing ticket.

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