[TYPO3-project-formidable] Validation against other input

[Uwe Grohne]

Hi,

I want to validate in the seminars extension, that the number of seats 
selected in the registration form is equal to the count of lines in the 
textarea for the attendees, so that I know, that the registering person 
entered as many persons as seats were reserved. I didn't find any hint on 
how to do this, cause I think, I will have to combine a custom PHP validator 
with another value. Any ideas on this?

This is the original part of the file:

  <renderlet:LISTBOX name="seats">
   <data>
    <items>
     <item value="1" caption="1" />
     <item value="2" caption="2" />
     <item value="3" caption="3" />
     <item value="4" caption="4" />
     <item value="5" caption="5" />
    </items>
    <defaultvalue>1</defaultvalue>
   </data>
   <validators>
    <validator:PREG>
     <pattern>
      <value>/^[\d]*$/</value>
      <message>LLL:EXT:seminars/pi1/locallang.xml:message_noSeatsNumber</message>
     </pattern>
    </validator:PREG>
    <validator:STANDARD>
     <userobj>
      <extension>this</extension>
      <method>canRegisterSeats</method>
      <message>LLL:EXT:seminars/pi1/locallang.xml:message_invalidNumberOfSeats</message>
     </userobj>
    </validator:STANDARD>
   </validators>
   <process>
    <userobj>
     <extension>this</extension>
     <method>hasRegistrationFormField</method>
     <params>
      <data name="elementname" value="seats" />
     </params>
    </userobj>
   </process>
  </renderlet:LISTBOX>

  <renderlet:TEXTAREA name="attendees_names">
   <validators>
    <validator:STANDARD>
     <userobj>
      <extension>this</extension>
      <method>hasAttendeesNames</method>
      <message>LLL:EXT:seminars/pi1/locallang.xml:message_provideAttendeesNames</message>
     </userobj>
    </validator:STANDARD>
   </validators>
   <process>
    <userobj>
     <extension>this</extension>
     <method>hasRegistrationFormField</method>
     <params>
      <data name="elementname" value="attendees_names" />
     </params>
    </userobj>
   </process>
  </renderlet:TEXTAREA>

Thanks in advance!