View source for Add functions (pre/post/...) to an existing node

{{howto|Advanced|[[Thomas Holz]] <vhskids@gmx.de>}}

Modifiers allow you to modify nodes on before they are used. To add [[triggers|functions like preUpdate]] use atkTriggerListener


'''Example of using atkTriggerListener:'''

Add the following code in your module_preload.inc (if this file is not present, create it in your module's directory):

<syntaxhighlight lang="php">
 $modifiers[] = 'modules.node';
</syntaxhighlight>

In your module.inc:

<syntaxhighlight lang="php">
 class mod_mymodule extends atkModule 
 {
    function module_node_modifier(&$node)
    {
        atkimport("module.mymodule.myListener");
        $node->addListener(new MyListener());
    }
 }
</syntaxhighlight>

now setup class.myListener.inc. The Listner contain the new functions. They will be called automatically by the node.

<syntaxhighlight lang="php">
  atkimport("atk.utils.atktriggerlistener");

  class MyListener extends atkTriggerListener
  {
  
  function preUpdate( &$record )
  { 
    do some code....
    return true;
  }
</syntaxhighlight>