Dependant layered navigation filters in Magento

Although not the best method, we wrote a quick and easy means to remove layered navigation filters that are dependant on other filters being enabled. This code should really be in the block and popped into an extension - with the attributes administrable via the backend, but for the purposes of this tutorial - we are just going to hardcode it into the template and let you decide how you want to improve it.
  • 1


    Open ./app/design/frontend/default/default/template/catalogue/layer/view.phtml
  • 2


     <?php /*Create filter dependencies*/
     $_activeFilters[] = array();
     $_filters = Mage::getSingleton('Mage_Catalog_Block_Layer_State')->getActiveFilters();
     $_depends = array(
     "fits product" => array("product manufacturer")
    foreach ($_filters as $_filter):
    $_activeFilters[] = strtolower($_filter->getName());
    just before getStateHtml() ?>
  • 3


    Replace the contents of
    <dl id="narrow-by-list"> ... </dl>
     <?php $_filters = $this->getFilters() ?>
     <?php foreach ($_filters as $_filter): ?>
     <?php if($_filter->getItemsCount()): ?>
     <?php /*Hide filters whose dependencies are not enabled*/
     $_showFilter = true;
     $_filterDepends = &$_depends[strtolower($_filter->getName())];
     foreach ($_filterDepends as $_filterDepend):
     if (!in_array($_filterDepend,$_activeFilters) && $_showFilter) {
    $_showFilter = false;
     <?php if($_showFilter): ?>
     <dt><?php echo $this->__($_filter->getName()) ?></dt>
     <?php echo $_filter->getHtml() ?>
     <?php endif; ?>
     <?php endif; ?>
     <?php endforeach; ?>
  • 4


    Change $_depends in step 1 to reflect the names of the attributes that have dependencies on each other.
     $_depends = array(
     "fits product" => array("product manufacturer")
    Ie. In our example, we do not want to display fits product until product manufacturer has been filtered.