Display 3rd level category for Active Category on Category Page for Opencart

Date Tested: 9 November 2017
Version: Opencart V2.3.0.2

Situation: On the Category page's left column, only 1 subcategory level is displayed for the Active category.
Example:
Electronics (Active)
- Digital Devices
- Home Appliances
Beauty
Food

Objective: List the next subcategory level of the above listed subcategory level.
Example:
Electronics (Active)
- Digital Devices
- Mobile Phones
- Cameras
- Home Appliances
- Kitchen Appliances
- Cleaning Appliances
Beauty
Food

Number of Files to modify: 2
1) catalog / controller / extension / module / category.php
2) catalog / view / theme / default / template / extension / module / category.tpl

MODIFICATION:

1) catalog / controller / extension / module / category.php

<?php
class ControllerExtensionModuleCategory extends Controller {
 public function index() {
  $this->load->language('extension/module/category');

$data['heading_title'] = $this->language->get('heading_title');

if (isset($this->request->get['path'])) {
   $parts = explode('_', (string)$this->request->get['path']);
  } else {
   $parts = array();
  }

if (isset($parts[0])) {
   $data['category_id'] = $parts[0];
  } else {
   $data['category_id'] = 0;
  }

if (isset($parts[1])) {
   $data['child_id'] = $parts[1];
  } else {
   $data['child_id'] = 0;
  }

$this->load->model('catalog/category');

$this->load->model('catalog/product');

$data['categories'] = array();

$categories = $this->model_catalog_category->getCategories(0);

foreach ($categories as $category) {
   $children_data = array();

if ($category['category_id'] == $data['category_id']) {
    $children = $this->model_catalog_category->getCategories($category['category_id']);

foreach($children as $child) {
     $filter_data = array('filter_category_id' => $child['category_id'], 'filter_sub_category' => true);
     
     /*** START CHANGE ***/
     $childcatid = $child['category_id'];
     $children2_data = array();
     $num_of_nested_categories = $this->model_catalog_category->getTotalCategoriesByCategoryId($childcatid);
     if ($num_of_nested_categories > 0) {
      $children2 = $this->model_catalog_category->getCategories($childcatid);
      foreach($children2 as $nested_cat) {
       $filter_nested_data = array('filter_category_id' => $nested_cat['category_id'], 'filter_sub_category' => true);
       $children2_data[] = array(
        'category_id' => $nested_cat['category_id'],
        'name' => $nested_cat['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_nested_data) . ')' : ''),
        'href' => $this->url->link('product/category', 'path=' . $childcatid . '_' . $nested_cat['category_id'])
       );
      }
     }
     
     $children_data[] = array(
      'category_id' => $child['category_id'],
      'name' => $child['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
      'children2'    => $children2_data,
      'href' => $this->url->link('product/category', 'path=' . $category['category_id'] . '_' . $child['category_id'])
     );
     /*** END CHANGE ***/
     
    }
   }

$filter_data = array(
    'filter_category_id'  => $category['category_id'],
    'filter_sub_category' => true
   );

$data['categories'][] = array(
    'category_id' => $category['category_id'],
    'name'        => $category['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
    'children'    => $children_data,
    'href'        => $this->url->link('product/category', 'path=' . $category['category_id'])
   );

}

return $this->load->view('extension/module/category', $data);
 }
}

2) catalog / view / theme / default / template / extension / module / category.tpl

<div class="list-group">
  <?php foreach ($categories as $category) { ?>
   <?php if ($category['category_id'] == $category_id) { ?>
    <a href="<?php echo $category['href']; ?>" class="list-group-item active"><?php echo $category['name']; ?></a>
    <?php if ($category['children']) { ?>
     <?php foreach ($category['children'] as $child) { ?>
        
      <?php if ($child['category_id'] == $child_id) { ?>
       <a href="<?php echo $child['href']; ?>" class="list-group-item active">   - <?php echo $child['name']; ?></a>
        <?php if ($child['children2']) { ?>
       <?php foreach ($child['children2'] as $nested) { ?>
        <a href="<?php echo $nested['href']; ?>" class="list-group-item">      - <?php echo $nested['name']; ?></a>
       <?php } ?>
        <?php } ?>
     
      <?php } else { ?>
       <a href="<?php echo $child['href']; ?>" class="list-group-item">   - <?php echo $child['name']; ?></a>
        <?php if ($child['children2']) { ?>
       <?php foreach ($child['children2'] as $nested) { ?>
        <a href="<?php echo $nested['href']; ?>" class="list-group-item">      - <?php echo $nested['name']; ?></a>
       <?php } ?>
        <?php } ?>
          
     
      <?php } ?>
     <?php } ?>
    <?php } ?>
   <?php } else { ?>
  <a href="<?php echo $category['href']; ?>" class="list-group-item"><?php echo $category['name']; ?></a>
   <?php } ?>
  <?php } ?>
</div>

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