/*
#########################################################################################################
# Project:     PHP Link Directory - Link exchange directory @ http://www.phplinkdirectory.com/
# Module:      [AJAX Category Selection] @ http://www.frozenminds.com/phpld-ajax-categories.html
# Author:      Constantin Bejenaru aKa Boby @ http://www.frozenminds.com/
# Language:    AJAX (Based on Prototype and Scriptaculous libraries)
# License:     MIT (Copyright (c) 2006 Constantin Bejenaru - http://www.frozenminds.com)
# Version:     1.1
# Notice:      Please maintain this section
#########################################################################################################
*/

/* Function to load on event page start */
Event.observe(window, 'load', init_ajax_categs, false);

/* Loaded on page load */
function init_ajax_categs()
{
   if ($('toggleCategTree'))
   {
      Event.observe('toggleCategTree', 'click', toggleTree, false);
   }

   reload_categ_title();

   return false;
}

/* Effect applied to category title */
function catTitleEffect()
{
   if ($('catTitle'))
   {
      new Effect.Highlight('catTitle',{duration:1.5});
   }

   return false;
}

/* Close category tree */
function catTreeClose()
{
   if ($('categtree'))
   {
      new Effect.BlindUp('categtree',{duration:0.9, delay: 1});
   }

   /* Remove category tree element. Suggestion: leave this code intact */
   setTimeout('destroyCatTree();', 2100);

   return false;
}

/* Destroy category tree element. Useful to clean generated code and prevent overwriting of elements. */
function destroyCatTree()
{
   if ($('categtree'))
      Element.remove('categtree');
}

/* Apply different functions to category tree */
function toggleTree()
{
   if (!$('categtree'))
   {
      if ($('CATEGORY_ID'))
      {
         reload_categ_tree($F('CATEGORY_ID'));
      }
      else if ($('PARENT_ID'))
      {
         reload_categ_tree($F('PARENT_ID'));
      }
   }
   else
   {
      catTreeClose();
   }

   return false;
}

/* Update the category tree depending on provided information */
function update_categ_selection(categID, parentID, subcategs)
{
   /* Validate category ID */
   categID = (categID ? categID : 0);
   categID = (categID < 0 ? 0 : categID);

   select_cat(categID);

   if (subcategs == 1)
      reload_categ_tree(categID);

   return false;
}

/* Reload the category tree by provided category ID */
function reload_categ_tree(categID)
{
   /* Validate category ID */
   categID = (categID ? categID : 0);
   categID = (categID < 0 ? 0 : categID);

   if ($('CATEGORY_ID') || $('PARENT_ID'))
   {
      var url = 'categ-tree.php';
      var params = 'categID=' + categID;
      var target = 'categtreebox';
      var myAjax = new Ajax.Updater(target, url, { method: 'get', parameters: params});
   }

   return false;
}

/* Reload category title by available category ID (found automatically) */
function reload_categ_title()
{
   if ($('catTitle') && ($('CATEGORY_ID') || $('PARENT_ID')))
   {
      var url = 'categ-tree.php';

      if ($('CATEGORY_ID'))
         var params = 'action=titleupdate&categID=' + escape ($F('CATEGORY_ID'));
      else if ($('PARENT_ID'))
         var params = 'action=titleupdate&categID=' + escape ($F('PARENT_ID'));

      var target = 'catTitle';
      var myAjax = new Ajax.Updater(target, url, { method: 'get', parameters: params});
   }

   return false;
}

/* Make category selection */
function select_cat(categID)
{
   /* Validate category ID */
   categID = (categID ? categID : 0);
   categID = (categID < 0 ? 0 : categID);

   if ($('CATEGORY_ID'))
   {
      document.getElementById('CATEGORY_ID').value = categID;
      reload_categ_title();
      catTitleEffect();
   }
   else if ($('PARENT_ID'))
   {
      document.getElementById('PARENT_ID').value = categID;
      reload_categ_title();
      catTitleEffect();
   }

   return false;
}

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