Magento – Show Only Subcategories of Specific Category in Top Menu

menunavigation

These are my categories :

Root category
---> Shoes
---- ---> Red    shoes
---- ---> Green  shoes
---- ---> Yellow shoes
---> Shirts
---- ---> Black shirts
---- ---> White shirts
---- ---> Blue  shirts

and my top menu would be like:

-Shoes -Shirts

But I only want to show my shoes in the top menu, Like this :

-Red shoes -Green shoes -Yellow shoes

How can I do that?

Best Answer

The categories are added in the top menu using this method Mage_Catalog_Model_Observer::addCatalogToTopmenuItems.
buy default the method looks like this:

public function addCatalogToTopmenuItems(Varien_Event_Observer $observer)
{
    $this->_addCategoriesToMenu(Mage::helper('catalog/category')->getStoreCategories(), $observer->getMenu());
}

This means that it adds to the top menu the result of Mage::helper('catalog/category')->getStoreCategories() recursively.
All you need to do is to rewrite this method and make it show only the child categories you need.

Something like this. Let's say that your shoes category id is 5.

public function addCatalogToTopmenuItems(Varien_Event_Observer $observer)
{
    $parent = 5;
    $recursionLevel  = max(0, (int) Mage::app()->getStore()->getConfig('catalog/navigation/max_depth') - 1) //subtract 1 from the set recursion level because we skip a level;
    $categories= Mage::getModel('catalog/category')->getCategories($parent, $recursionLevel, false, false, true);
    $this->_addCategoriesToMenu($categories, $observer->getMenu());
}

I haven't tested it, but I think the idea is there.

Related Solutions

Magento – Top navigation menu stopped displaying

From the comments, it seams that the problem was solved by rebuilding the indexes.

Magento – Adding attributes as a dropdown in Main Category Navigation

Based on this question and this one. I've put up the following "module" that should do what you need.
The main idea is to get the categories menu, identify the attributes used in layered navigation and display a link to the filtered category for each option in the attribute.
The extension is called Easylife_Nav. The extension files:

app/etc/modules/Easylife_Nav.xml - the declaration file

<?xml version="1.0"?>
<config>
    <modules>
        <Easylife_Nav>
            <codePool>local</codePool>
            <active>true</active>
            <depends>
                <Mage_Catalog />
            </depends>
        </Easylife_Nav>
    </modules>
</config>

app/code/local/Easylife/Nav/etc/config.xml - the configuration file

<?xml version="1.0"?>
<config>
    <modules>
        <Easylife_Nav>
            <version>0.0.1</version>
        </Easylife_Nav>
    </modules>
    <global>
        <helpers>
            <easylife_nav>
                <class>Easylife_Nav_Helper</class>
            </easylife_nav>
        </helpers>
        <models>
            <easylife_nav>
                <class>Easylife_Nav_Model</class>
            </easylife_nav>
        </models>
    </global>
    <frontend>
        <events>
            <page_block_html_topmenu_gethtml_before> <!-- observe the menu generation event -->
                <observers>
                    <easylife_nav>
                        <class>easylife_nav/observer</class>
                        <method>addAttributes</method>
                    </easylife_nav>
                </observers>
            </page_block_html_topmenu_gethtml_before>
        </events>
    </frontend>
</config>

app/code/local/Easylife/Nav/Helper/Data.php - the module main helper

<?php
class Easylife_Nav_Helper_Data extends Mage_Core_Helper_Abstract {

}

app/code/local/Easylife/Nav/Model/Observer.php - the module observer

<?php
class Easylife_Nav_Model_Observer {
    public function addAttributes($observer){
        $menu = $observer->getMenu();
        $tree = $menu->getTree();
        //get all first level menu items
        foreach ($menu->getChildren() as $child){
            $nodeId = $child->getId();
            //check if the node id starts with `category-node-` - so it's a category
            if (substr($nodeId, 0, strlen('category-node-')) == 'category-node-') {
                //identify the category id
                $id = str_replace('category-node-', '', $nodeId);
                //remember the main category url
                $mainUrl = $child->getUrl();
                //get category filtrable attributes
                $attributes = $this->getAttributes($id);
                foreach ($attributes as $attribute) { 
                    //get the options for each attribute
                    $options = $attribute->getSource()->getAllOptions();
                    if (count($options) > 0) {
                        //add "By ..." menu item - non clickable
                        $attrNodeId = 'attribute-'.$id.'-'.$attribute->getId();
                        $data = array(
                            'name' => Mage::helper('easylife_nav')->__('By %s', $attribute->getFrontendLabel()),
                            'id' => $attrNodeId,
                            'url' => '#',
                            'is_active' => false
                        );
                        $attrNode = new Varien_Data_Tree_Node($data, 'id', $tree, $menu);
                        //for each option add a new sub menu
                        foreach ($options as $option) {
                            if ($option['value']) {
                                $optionNodeId = 'attribute-'.$id.'-'.$attribute->getId().'-'.$option['value'];
                                $data = array(
                                    'name' => $option['label'],
                                    'id' => $optionNodeId,
                                    'url' => $mainUrl.'?'.$attribute->getAttributeCode().'='.$option['value'],
                                    'is_active' => false
                                );
                                $optionNode = new Varien_Data_Tree_Node($data, 'id', $tree, $menu);
                                $attrNode->addChild($optionNode);
                            }
                        }
                        $child->addChild($attrNode);
                    }
                }
            }
        }
    }
    //get allowed attributes in that category
    public function getAttributes($categoryId) {
        $layer = Mage::getModel("catalog/layer");
        $layer->setCurrentCategory(Mage::getModel('catalog/category')->load($categoryId));
        $validAttributes = array();
        foreach ($layer->getFilterableAttributes() as $attribute) {
            //allow only select attributes - you can implement your additional filters here
            if ($attribute->getFrontendInput() == 'select'){
                $validAttributes[] = $attribute;
            }
        }
        return $validAttributes;
    }
}

Clear the cache and try it out.

Best Answer

Related Solutions

Magento – Top navigation menu stopped displaying

Magento – Adding attributes as a dropdown in Main Category Navigation

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