Orsdxy

I am using Magento 2.2.4 for online Bookstore. I have books under categories and sub-categories.

I need to list all these categories and sub-categories on Homepage left side like in the Screenshot below.

When clicking on the ctaegory, it should be navigated to the books under relevant category. Since I am fresher to Magento and PHP, I am trying customization using CMS rather code modifications. I tried this with widgets and blocks, but I could not find an effective way. Is there a way to do this?

I have to do something similar and I have used following code to achieve the requirement.

app/code/Anshu/CategoryFilter/registration.php

<?php



MagentoFrameworkComponentComponentRegistrar::register(

    MagentoFrameworkComponentComponentRegistrar::MODULE,

    'Anshu_CategoryFilter',

    __DIR__

);

app/code/Anshu/CategoryFilter/etc/module.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">

    <module name="Anshu_CategoryFilter" setup_version="1.0.0">

        <sequence>

            <module name="Magento_Catalog"/>

        </sequence>

    </module>

</config>

app/code/Anshu/CategoryFilter/Block/CategoryFilter.php

<?php



namespace AnshuCategoryFilterBlock;



class CategoryFilter extends MagentoFrameworkViewElementTemplate {



    /**

     * @var MagentoCatalogHelperCategory

     */

    protected $_categoryHelper;



    /**

     * @var MagentoCatalogModelIndexerCategoryFlatState

     */

    protected $categoryFlatConfig;



    /**

     * @var MagentoCatalogModelCategoryFactory

     */

    protected $_categoryFactory;



    /**

     * @param TemplateContext                                        $context

     * @param MagentoCatalogHelperCategory                        $categoryHelper

     * @param MagentoCatalogModelIndexerCategoryFlatState      $categoryFlatState

     * @param MagentoCatalogModelCategoryFactory                  $categoryFactory

     * @param array                                                   $data

     */

    public function __construct(

        MagentoFrameworkViewElementTemplateContext $context,

        MagentoCatalogHelperCategory $categoryHelper,

        MagentoCatalogModelIndexerCategoryFlatState $categoryFlatState,

        MagentoCatalogModelCategoryFactory $categoryFactory,

        $data = 

    )

    {

        $this->_categoryHelper           = $categoryHelper;

        $this->categoryFlatConfig        = $categoryFlatState;

        $this->_categoryFactory          = $categoryFactory;

        parent::__construct($context, $data);

    }



    /**

     * Get all categories

     *

     * @param bool $sorted

     * @param bool $asCollection

     * @param bool $toLoad

     *

     * @return array|MagentoCatalogModelResourceModelCategoryCollection|MagentoFrameworkDataTreeNodeCollection

     */

    public function getCategories($sorted = false, $asCollection = false, $toLoad = true)

    {

        $cacheKey = sprintf('%d-%d-%d-%d', $this->getSelectedRootCategory(), $sorted, $asCollection, $toLoad);

        if ( isset($this->_storeCategories[ $cacheKey ]) )

        {

            return $this->_storeCategories[ $cacheKey ];

        }

        /**

         * Check if parent node of the store still exists

         */

        $category = $this->_categoryFactory->create();



        $storeCategories = $category->getCategories($this->getSelectedRootCategory(), $recursionLevel = 0, $sorted, $asCollection, $toLoad);

        $this->_storeCategories[ $cacheKey ] = $storeCategories;

        return $storeCategories;

    }



    /**

     * Get current store root category id

     *

     * @return int|mixed

     */

    public function getSelectedRootCategory()

    {

        return $this->_storeManager->getStore()->getRootCategoryId();

    }



    /**

     * @param        $category

     * @param string $html

     * @param int    $level

     *

     * @return string

     */

    public function getChildCategoryView($category, $html = '', $level = 1)

    {   

        // Check if category has children

        if ( $category->hasChildren() )

        {  

            $childCategories = $this->getSubcategories($category);

            $childCount = (int)$category->getChildrenCount();

            if ( $childCount > 0 )

            {   

                $html .= '<ul class="o-list o-list--unstyled" style="display:none">';

                // Loop through children categories

                foreach ( $childCategories as $childCategory )

                {

                    $html .= '<li class="level' . $level . '">';

                    $html .= '<a href="' . $this->getCategoryUrl($childCategory) . '" title="' . $childCategory->getName() . '">' . $childCategory->getName() . '</a>';

                    if ($childCategory->hasChildren())

                    {

                        $html .= '<span class="expand"><i class="fa fa-plus">+/-</i></span>';

                        $html .= $this->getChildCategoryView($childCategory, '', ($level + 1));

                    }



                    $html .= '</li>';

                }

                $html .= '</ul>';

            }

        }

        return $html;

    }



    /**

     * Retrieve subcategories

     * 

     * @param $category

     *

     * @return array

     */ 

    public function getSubcategories($category)

    {

        if ($this->categoryFlatConfig->isFlatEnabled() && $category->getUseFlatResource()) {

            $subcategories = (array)$category->getChildrenNodes();

        } else {

            $subcategories = $category->getChildren();

        }

        return $subcategories;

    }



    /**

     * Return Category URL

     *

     * @param $category

     *

     * @return string

     */

    public function getCategoryUrl($category)

    {

        return $this->_categoryHelper->getCategoryUrl($category);

    }

}

app/code/Anshu/CategoryFilter/view/frontend/requirejs-config.js

var config = {

    map: {

        '*': {

            categoryfilter: 'Anshu_CategoryFilter/js/categoryfilter'

        }

    }

};

app/code/Anshu/CategoryFilter/view/frontend/web/js/categoryfilter.js

require(['jquery'], function ($) {

    $(function () {

        $('.category-heading').on('click', function () {

            $('.category-filter').toggle();

        });

        $('.category-filter').on('click', '.o-list .expand, .o-list .expanded', function () {

            var element = $(this).parent('li');

            if (element.hasClass('active')) {

                element.find('ul:first').slideUp();

                element.removeClass('active');

            } else {

                element.addClass('active');

                element.children('ul').slideDown();

                element.parent('ul').find('i').addClass('fa-plus');

                element.find('> span i').addClass('fa-minus');

            }

        });

    });

});

app/code/Anshu/CategoryFilter/view/frontend/templates/categoryfilter.phtml

<?php

$categories = $block->getCategories();

?>

<div class="category-filter-area">

    <div class="filter-heading">

        <h3><?php echo __('CATEGORY'); ?></h3>

    </div>

    <div class="category-filter">

        <ul class="o-list">

            <?php

            // Loop through categories

            foreach ( $categories as $category ) {

                ?>

                <li class="level0">

                    <a href="<?php echo $block->getCategoryUrl($category); ?>" title="<?php echo $category->getName(); ?>">

                        <?php echo $category->getName(); ?>

                    </a>

                    <?php if ( $category->hasChildren() ) { ?>

                        <span class="expand"><i class="fa fa-plus">+/-</i></span>

                    <?php } ?>



                    <?php echo $block->getChildCategoryView($category, $html = '', $level = $category->getLevel() + 1); ?>

                </li>

            <?php } ?>

        </ul>

    </div>

</div>    

<script type="text/javascript">

    require(['jquery','categoryfilter'], function () {});

</script>

You can modify this code according to your requirement.
I hope this will be helpful.

I have to show this block on cms page, so I have called it in CMS page in admin. You can call this or show this block at any place you want.