0
class Ab_CategoryObserver_Model_Observer{
  public function updateTopMenuJson(Varien_Event_Observer $observer){
      $_helper = Mage::helper('catalog/category');
      $_categories = $_helper->getStoreCategories();
      $recursionLevel = '';
      $storeId = '';
      $node = '';

      $categoryTreeData = $this->getCategoryTree($recursionLevel, $storeId);
      $categoryData = $this->getNodeChildrenData($node);

      $arr = json_encode(getCategoryTree(3));
      echo "<pre>";print_r($arr);
      echo("<script>console.log('PHP: ".$arr."');</script>");
      file_put_contents("cat_node.json", $arr);
    }

    protected function getCategoryTree($recursionLevel, $storeId = 1)
    {
        $parent = Mage::app()->getStore()->getRootCategoryId();
        $tree = Mage::getResourceModel('catalog/category_tree');
        /* @var $tree Mage_Catalog_Model_Resource_Category_Tree */

        $nodes = $tree->loadNode($parent)
            ->loadChildren($recursionLevel)
            ->getChildren();
        $tree->addCollectionData(null, false, $parent);

        $categoryTreeData = array();
        foreach ($nodes as $node) {
            $categoryTreeData[$node->getData('entity_id')] = getNodeChildrenData($node);
        }

        return $categoryTreeData;
    }

    protected function getNodeChildrenData(Varien_Data_Tree_Node $node)
    {
        $categoryData = array(
          'title' => $node->getData('name'),
          'url'   => $node->getData('url_key'),
          'id'    => $node->getId(),
          'img_url'=> $node->getImageUrl(),
          // 'mega_menu1'=> $node->getData('mega_menu')
          'mega_menu'=> 'false'
        );

        foreach ($node->getChildren() as $childNode) {
          if (!array_key_exists('children', $categoryData)) {
              $categoryData['mega_menu'] = 'true';
              $categoryData['children'] = array();
          }

            $categoryData['children'][$childNode->getData('entity_id')] = getNodeChildrenData($childNode);
        }
        return $categoryData;
    }
} // End of Class
?>
0

Change

$categoryTreeData[$node->getData('entity_id')] = getNodeChildrenData($node);

to

$categoryTreeData[$node->getData('entity_id')] = $this->getNodeChildrenData($node);
  • why do you have $categoryData = $this->getNodeChildrenData($node); in updateTopMenuJson method ? as the $node you are passing in here is a blank string $node=''; you need to give Varien_Data_Tree_Node object. – Priyank May 29 '17 at 5:36
0

As the question with accepted answer is closed I am posting the answer to this question.

The issue seems to be with your function updateTopMenuJson, You have used $node = ''; and then you are passing it to $categoryData = $this->getNodeChildrenData($node); which triggers the error.

Use below code.

<?php
class Ab_CategoryObserver_Model_Observer{
  public function updateTopMenuJson(Varien_Event_Observer $observer){
      $_helper = Mage::helper('catalog/category');
      $_categories = $_helper->getStoreCategories();
      $recursionLevel = 3; // Add recursion level
      $storeId = 1; // Add your Store ID for which you want to get category tree
      $node = '';
      $categoryTreeData = $this->getCategoryTree($recursionLevel, $storeId);
      $arr = json_encode($this->getCategoryTree(3));
      echo "<pre>";print_r($arr);
      echo("<script>console.log('PHP: ".$arr."');</script>");
      file_put_contents("cat_node.json", $arr);
    }

    protected function getCategoryTree($recursionLevel, $storeId = 1)
    {
        $parent = Mage::app()->getStore($storeId)->getRootCategoryId();
        $tree = Mage::getResourceModel('catalog/category_tree');
        /* @var $tree Mage_Catalog_Model_Resource_Category_Tree */

        $nodes = $tree->loadNode($parent)
            ->loadChildren($recursionLevel)
            ->getChildren();
        $tree->addCollectionData(null, false, $parent);

        $categoryTreeData = array();
        foreach ($nodes as $node) {
            $categoryTreeData[$node->getData('entity_id')] = $this->getNodeChildrenData($node);
        }

        return $categoryTreeData;
    }

    protected function getNodeChildrenData(Varien_Data_Tree_Node $node)
    {
        $categoryData = array(
          'title' => $node->getData('name'),
          'url'   => $node->getData('url_key'),
          'id'    => $node->getId(),
          // 'mega_menu1'=> $node->getData('mega_menu')
          'mega_menu'=> 'false'
        );

        foreach ($node->getChildren() as $childNode) {
          if (!array_key_exists('children', $categoryData)) {
              $categoryData['mega_menu'] = 'true';
              $categoryData['children'] = array();
          }

            $categoryData['children'][$childNode->getData('entity_id')] = $this->getNodeChildrenData($childNode);
        }
        return $categoryData;
    }
} // End of Class
?>

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