[TYPO3-english] TelephoneNumber ViewHelper

[Robert Wildling]

Hi,

I am trying to get into writing my own ViewHelpers. The first "bigger" 
test is a TelephonNumber ViewHelper that transforms phone numbers to 
links with the href:"tel:*" attr (knowing that modern devices do this 
automatically, also knowing about the respective meta-tag... as said: 
this is just for practicing).

So far I got this, which works fine (thanks to the vhc collection; the 
whole thing gets implemented into the cbgooglemaps ext):

// Script
class Tx_Cbgooglemaps_ViewHelpers_Link_TelephoneNumberViewHelper extends 
Tx_Fluid_Core_ViewHelper_AbstractTagBasedViewHelper  {
   protected $tagName = 'a';
   /**
    * @param string $number The phone number to parse
    * @param string $type The link type ("tel", "skype", "callme",...)
    * @return string Rendered phone link
    */
   public function render( $number, $type='tel' ) {
     $linkText = $number;
     $tagContent = $this->renderChildren();
     if ($tagContent !== NULL) { $linkText = $tagContent; }
     $this->tag->setContent($linkText);
     $this->tag->addAttribute('href', $type.':' .  $number);
     return $this->tag->render();
   }
}

// Template
{namespace l=Tx_Cbgooglemaps_ViewHelpers}
Telefon: <l:Link.TelephoneNumber 
number="{phone}">{phone}</l:Link.TelephoneNumber>


So far, so good. The problem starts, when there are is a list of comma 
seperated phone numbers to deal with. I started out with this:

public function render( $number, $type='tel' ) {
   $explodeStr = ",";
   // if $number is an array...
   if( strpos( $number, explodeStr) ){
     $numberArray = trim( explode( explodeStr, $number ));
       foreach ( $numberArray as $num ) {
         // how to deal with the $this->tag->foo, when
         // there is only one tag?
         // how shall the return value be put together?
       }
   } else {
     // code as before
   }
[...]


As the comments already say, I do not know how to deal with the 
render->children() and the like commands. Also, the final render-command 
has to be placed outside the foreach loop, right? So what would be the 
proper way to build it?


Thanks for your hints!
Greetings, Robert