How to identify a current subcategory (if any)

Question

I've got the following piece of code

  $_helper = Mage::registry('current_category');
  $_categoryUrl = $_helper->getUrlKey();
  $_categoryId = $_helper->getId();
  $_subcategories = $_helper->getChildrenCategories();
  echo '<script>';
  echo 'var el = $(document.getElementById("'.$_categoryId.'"));';
  echo 'el.classList.add("active");';
  echo '</script>';

  $_categories = Mage::helper('catalog/category')->getStoreCategories();
  foreach($_categories as $_category) {
  $_subcategories = $_category->getChildrenCategories();
  foreach($_subcategories as $_subcategory){
   echo '<script>';
   echo 'var el = $(document.getElementById("'.$_subcategory->getParentCategory()->getId().'"));';
   echo 'el.classList.add("active");';
   echo '</script>';
  }
 }

What it does is to look for categories and their subcategories, in order to apply a script. The result is that the script -in the first part- is applied to the current category without checking if this is is a parent category or a child category. In the second part, the script gets applied to all subcategories which is not want I'd want.

I just want that Magento identifies the current category and then make a check:

• If the current category is a parent category, then the script should apply the script only to it, adding the class 'active' to the element of that category.

• If the current category is a child category, then the script should be applied only to that subcategory, adding the class 'active' to the element of its parent category.

Code so far (v2):

<?php
        /** @var \Mage_Catalog_Model_Category $category */
    $category = Mage::registry('current_category');
    $isChild = $category->getLevel() > 2;
    $isParent = (bool)$category->getChildrenCategories()->getSize();

    $categoryId = null;
    if($isChild) {
        $categoryId = $category->getParentCategory()->getId();
    } elseif($isParent) {
        $categoryId = $category->getId();
    }
?>

<?php if($categoryId): ?>
<script>
<?php
   echo 'if (( “#dropdown-menu” ).is( “.active” )) { ';
   echo 'var el = document.getElementById("'.$categoryId.'");';
   echo 'el.classList.add("active");';
   echo '}';
?>
</script>
<?php endif; ?>

The javascript does not seem to work, it is not to see in the browser's console when inspection the category page.

Answer 1

Here is a solution that does exactly what you ask but without the inefficient looping and nested foreach's. The only thing I am not sure of how you would want handled is, what is the category is both a parent AND a child.

<?php
    /** @var \Mage_Catalog_Model_Category $category */
    $category = Mage::registry('current_category');
    $isChild = $category->getLevel() > 2;
    $isParent = (bool)$category->getChildrenCategories()->getSize();

    $categoryId = null;
    if ($isChild) {
        $categoryId = $category->getParentCategory()->getId();
    } elseif ($isParent) {
        $categoryId = $category->getId();
    }
?>
<?php if ($categoryId) : ?>
    <script>
        var el = $(document.getElementById('<?php echo $categoryId; ?>'));
        el.classList.add("active");
    </script>
<?php endif; ?>

I should also mention, this logic all belongs inside of a block class. However, I made the answer to best suit what I think you are doing, which is putting it inside of a phtml file.