In this blog we will see how generate a category tree, recursively showing all categories and sub categories.
The code is given below, will explain the code line by line
<?php
$rootcatId= Mage::app()->getStore()->getRootCategoryId();
$categories = Mage::getModel('catalog/category')->getCategories($rootcatId);
function get_categories($categories) {
$array= '<ul>';
foreach($categories as $category) {
$cat = Mage::getModel('catalog/category')->load($category->getId());
$count = $cat->getProductCount();
$array .= '<li>'.
'<a href="' . Mage::getUrl($cat->getUrlPath()). '">' .
$category->getName() . "(".$count.")</a>\n";
if($category->hasChildren()) {
$children = Mage::getModel('catalog/category')->getCategories($category->getId());
$array .= get_categories($children);
}
$array .= '</li>';
}
return $array . '</ul>';
}
echo get_categories($categories); ?>
Explanation of the code step by step:
$rootcatId= Mage::app()->getStore()->getRootCategoryId();
This function gives return the Root Catalog Id of your current store. Usually the value is 2 but its always better to use this function.
$categories = Mage::getModel('catalog/category')->getCategories($rootcatId);
This function returns all sub categories of the parent category. This function is defined in Mage_Catalog_Model_Category. the definition is
/**
* Retrieve categories by parent
*
* @param int $parent
* @param int $recursionLevel
* @param bool $sorted
* @param bool $asCollection
* @param bool $toLoad
* @return mixed
*/
public function getCategories($parent, $recursionLevel = 0, $sorted=false, $asCollection=false, $toLoad=true);
function get_categories($categories) { //This is the recursive function created and here we pass the a collection of categories.
$array= '<ul>'; //$array is a variable to store all the category detail .
foreach($categories as $category) {
$cat = Mage::getModel('catalog/category')->load($category->getId());
$count = $cat->getProductCount(); //$count the total no of products in the category
$array .= '<li>'.'<a href="' . Mage::getUrl($cat->getUrlPath()). '">' . $category->getName() . "(".$count.")</a>\n"; //In this line we get an a link for the product and product count of that category
if($category->hasChildren()) { if category has children or not. If yes then it proceed in inside loop.
$children = Mage::getModel('catalog/category')->getCategories($category-> getId()); // $children get a list of all subcategories
$array .= get_categories($children); //recursive call the get_categories function again.
}
$array .= '</li>';
}
return $array . '</ul>';
}
echo get_categories($categories); //echo all categories in the website, with number of products
You can use your own css and javascript to design the html generated.
- See more at: http://excellencetechnologies.co.in/Telephonia/blog/magento-generate-category-tree-recursively/#sthash.vDwZfAn4.dpuf
