Hello I want to display a "Default Category" in nav main menu and all subcategory inside this. I know this question has been solved but I do not know how to do that

i have a template in vendor topmenu.html

 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.

 * Top menu for store
 * @var $block \Magento\Theme\Block\Html\Topmenu

$columnsLimit = $block->getColumnsLimit() ?: 0;
$_menuHtml = $block->getHtml('level-top', 'submenu', $columnsLimit)

<nav class="navigation" data-action="navigation">
    <ul data-mage-init='{"menu":{"responsive":true, "expanded":true, "position":{"my":"left top","at":"left bottom"}}}'>
        <?= /* @noEscape */ $_menuHtml?>
        <?= $block->getChildHtml() ?>

I see this solution but i don't know to add this because i have a error when i add this code in override topmenu Error: Class 'Mage' not found


  $root_category = Mage::getModel('catalog/category')->load(3); // Put your root category ID here.
  $subcategories = $root_category->getChildren();
  foreach(explode(',',$subcategories) as $subcategory) {
        $category = Mage::getModel('catalog/category')->load($subcategory);
        echo '<a href="'.$category->getURL() .'" />'.$category->getName().'</a><br/>';


Please how to do to display root category and submenu in main menu


  • Default category is static you could not find it in database. so you should write default category as satic.
    – S.P
    Commented Apr 19, 2022 at 5:15
  • @S.P Thanks how to write default category in static to be able to display it?
    – pleonasme
    Commented Apr 19, 2022 at 6:34
  • add echo '<a href="#" />Default Category </a><br/>'; at the top of your function.
    – S.P
    Commented Apr 19, 2022 at 6:38
  • please can you rewrite a template topmenu.phtml i don't undesrtand and why i have a error Error: Class 'Mage' not found
    – pleonasme
    Commented Apr 19, 2022 at 6:49
  • Might be your are using magento1.x,
    – S.P
    Commented Apr 19, 2022 at 6:54

1 Answer 1


Magento2 does not use Mage class,

You should use category factory object (Magento\Catalog\Model\ResourceModel\Category\CollectionFactory) in block constructor

$objectManager = $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$categoryFactory = $objectManager->create('Magento\Catalog\Model\ResourceModel\Category\CollectionFactory');
$categories = $categoryFactory->create()                              

foreach ($categories as $category){

Reference How to get Category Collection per Store in Magento 2?


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