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

     

    Add
     <?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());
    endforeach; 
    ?>
    
    just before getStateHtml() ?>
  • 3

     

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

    this works great to show filter B after filter A has been selected

    but....

    is there a way to only show filters B and C after A has been selected?

    • There is a way to anything you want, get in touch with our team for a quote 😉

  • If you're using solr with Enterprise you want to do:

    Mage::getSingleton('enterprise_search/catalog_layer')->getState()->getFilters()

    In order to get the active filters.

  • Paul Young

    Hi,
    Is it possible to adapt this solution to only show certain filters if a user in in a particular category?

    • Of course it is - anything with Magento is possible, its just a case of time and money. But this is more of a 'working concept' than production solution.

      In practice, we don't perform any logic in the template files, but in the relevant blocks/models that precede those.

  • Mary Brook

    Hi, I recommend to take a look at Improved Navigation Extension by Amasty. it provides you with functionality to show certain filters according to dependent attributes. make sure at http://amasty.com/improved-navigation.html

  • Robert

    I know this is an old post, how would I use this to not display "fits product" or "model" until product manufacturer is filtered? Basically creating a double dependency.