Including modifiers when extending nodes

ATK Howto: Including modifiers when extending nodes Complexity: easy Author: June Henriksen <juneih@linpro.no>

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This howto explains how you can include modifiers when you extend a node.

All modifiers added to a node will be run in the node's init function. Which modifiers that runs however, depends on the m_type of a node, which will be different for any node that extends it. In order to have the modifiers run, some changes has to be made in the extended nodes init node.

An example init_node:

function init()
 {
   $ret = parent::init();
   $oldtype = $this->m_type;
   $oldmodule= $this->m_module;
   $this->m_type='hours';
   $this->m_module='timereg';

   global $g_modifiers;

   if (isset($g_modifiers[$this->atknodetype()]))
   {
     foreach ($g_modifiers[$this->atknodetype()] as $modulename)
     {
       $module = &getModule($modulename);
       $module->modifier($this);
     }
   }
   $this->m_module=$oldmodule;
   $this->m_type = $oldtype;

   return $ret;
 }

This example is for running the modifiers added to the hours modules, this can of course be exchanged for any other node. The function itself is put in the extending node.

The result of including this is that you now will have access to all the attributes added by modifiers to the node that is extended.

--juneih 16:29, 23 November 2006 (CEST)