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Try to get $select = clone Mage::getSingleton('catalog/layer')->getProductCollection()->getSelect(); Then you can modify the $select object to get COUNT() and fetch it. Note, you have the right co …

Unless you have some layered navigation extension that does the job for you, you can rewrite the categories filter model Mage_Catalog_Model_Layer_Filter_Category, not the template to show parent categ …

So you have the categories collection $categories and current facet selection in the $layer object. Then you can just call do $layer->getProductCollection() ->addCountToCategories($categor …

You can start from app\code\core\Mage\Catalog\Model\Layer\Filter\Attribute.php (it can be rewritten in the local pool or in the custom module) Note, the magento default function apply contains code t …

We did a lot of layered navigation customization for last five yerars, including the described one. Most clients do not change existing attributes but crestes a new one, like naviation-color and show …

It's default functionality. Please define the size attribute to be "Price" type, then set it as "Used in Layered Navigation". Reindex and you are done.

You need to rewrite app\code\core\Mage\Catalog\Model\Layer\Filter\Item.php to generate right urls and app\code\core\Mage\Catalog\Model\Layer\Filter\Attribute.php plus app\code\core\Mage\Catalog\Model …

Please see app\code\core\Mage\Catalog\Model\Layer\Filter\Category.php It gets the categories using method protected function _getItemsData() You can change its logic to return required category ID ( …

To add layered navigation to a custom page you basically need 1) Have the navigation block in the page layout 2) Use the Catalog Layer object to load product collection (and the modify it if needed) …

It is also possible 1) to hide layered navigation block from the output based on the user agents and filter our Google/Bing bots. 2) add a special variable in the url like "noind" and then in the …

You can remove some option directly in your theme template (dirty hack): app\design\frontend\base\default\template\catalog\layer\filter.phtml after line <?php foreach ($this->getItems() as $_ite …

Basically you can save layered navigation selection in the session. For this you may use of the pre-dispatch events. And update the Mage::app()->getRequest()->setParam('color', 13); Where 13 is the v …

You can disable the "Anchor" option in Product->Categories->[Your category name]->Display Setting

There 2 parts of the price filter in the layered navigation. The first one is frontend, by default it is only list of ranges, but you can modify it to a dropdown, slider or from-to widget in the .phr …

For your new size attribute set option "used in layered navigation" to "yes, filterable with results" and reindex.