Google Breadcrumb (schema.org microdate) for Prestashop 1.6

[trace]

Breadcrumbs for Google snippet. [updated]

Note: Before changing breadcrumbs, make sure that you have assigned the most relevant default category for each product. It is desirable that this category is the highest level of nesting, since the breadcrumbs path will be compiled on the basis of this category.
 
/theme/your_theme/breadcrumb.tpl code:

<!-- Breadcrumb -->
{if isset($smarty.capture.path)}{assign var='path' value=$smarty.capture.path}{/if}
<div class="breadcrumb" {if $page_name == 'product' or $page_name == 'category' or $page_name == 'cms'}itemscope itemtype="http://schema.org/BreadcrumbList"{/if}>
<!--    <div class="container"  > -->
        <!--<meta itemprop="name" content="{$meta_title|escape:'html':'UTF-8'}"/>-->
        <span {if $page_name == 'product' or $page_name == 'category' or $page_name == 'cms'}itemprop="itemListElement" itemscope="" itemtype="http://schema.org/ListItem"{/if}><meta itemprop="position" content="1"><a class="home" itemprop="item" href="{if isset($force_ssl) && $force_ssl}{$base_dir_ssl}{else}{$base_dir}{/if}" title="{l s='Return to Home'}"><meta itemprop="name" content="{l s='Home'}" /><i class="icon-home"></i></a></span>
    {if isset($path) AND $path}
        <span  class="navigation-pipe"  {if isset($category) && isset($category->id_category) && $category->id_category == (int)Configuration::get('PS_ROOT_CATEGORY')} style="display:none;"{/if}>{$navigationPipe|escape:'html':'UTF-8'}</span>
        {if $page_name == 'product' or $page_name == 'category' or $page_name == 'cms'}
            {if $path|strpos:'span' !== false}
                <span  class="navigation_page" >
                {$path|@replace:'<a ': '<span > <span >
                    <a itemprop="item" '|@replace:'data-gg="">': '>
                    <span >'|@replace:'</a>': '</a></span></span>'}</span>
            {else}
                <span itemprop="itemListElement" class="item-breadcrumb" itemscope="" itemtype="http://schema.org/ListItem"><meta itemprop="position" content="1"><meta itemprop="item" content="{if isset($force_ssl) && $force_ssl}https://{$smarty.server.HTTP_HOST}{$smarty.server.REQUEST_URI}{else}http://{$smarty.server.HTTP_HOST}{$smarty.server.REQUEST_URI}{/if}" /><meta itemprop="name" content="{$path}" /><span class="item-breadalone">{$path}</span></span>
            {/if}
        {else}
            {if $path|strpos:'span' !== false}
                <span  class="navigation_page" >
                {$path|@replace:'<a ': '<span > <span >
                    <a '|@replace:'data-gg="">': '>
                    <span >'|@replace:'</a>': '</a></span></span>'}</span>
            {else}
                <span class="item-breadalone">{$path}</span>
            {/if}
        {/if}
    {/if}
</div>

/override/classes/Tools.php

<?php

class Tools extends ToolsCore
{
    public static function getPath($id_category, $path = '', $link_on_the_item = false, $category_type = 'products', Context $context = null)
    {
        if (!$context)
            $context = Context::getContext();
        $id_category = (int)$id_category;
        if ($id_category == 1)
            return '<span class="navigation_end">'.$path.'</span>';
        $pipe = Configuration::get('PS_NAVIGATION_PIPE');
        if (empty($pipe))
            $pipe = '>';
        $full_path = '';
        if ($category_type === 'products')
        {
            $interval = Category::getInterval($id_category);
            $id_root_category = $context->shop->getCategory();
            $interval_root = Category::getInterval($id_root_category);
            if ($interval)
            {
                $sql = 'SELECT c.id_category, cl.name, cl.link_rewrite, cl.meta_title
                        FROM '._DB_PREFIX_.'category c
                        LEFT JOIN '._DB_PREFIX_.'category_lang cl ON (cl.id_category = c.id_category'.Shop::addSqlRestrictionOnLang('cl').')
                        '.Shop::addSqlAssociation('category', 'c').'
                        WHERE c.nleft <= '.$interval['nleft'].'
                            AND c.nright >= '.$interval['nright'].'
                            AND c.nleft >= '.$interval_root['nleft'].'
                            AND c.nright <= '.$interval_root['nright'].'
                            AND cl.id_lang = '.(int)$context->language->id.'
                            AND c.active = 1
                            AND c.level_depth > '.(int)$interval_root['level_depth'].'
                        ORDER BY c.level_depth ASC';
                $categories = Db::getInstance()->executeS($sql);
                $n = 1;
                $n_categories = count($categories);
                foreach ($categories as $key => $category)
                {
                    $key = $key+2;
                    $full_path .='<span itemprop="itemListElement" class="item-breadcrumb" itemscope="" itemtype="http://schema.org/ListItem" ><meta itemprop="position" content="'.$key.'">'. (($n < $n_categories || $link_on_the_item) ? '<a itemprop="url" href="'.Tools::safeOutput($context->link->getCategoryLink((int)$category['id_category'], $category['link_rewrite'])).'" title="'.htmlentities($category['name'], ENT_NOQUOTES, 'UTF-8').'">' : '<meta itemprop="url" content="'.Tools::safeOutput($context->link->getCategoryLink((int)$category['id_category'], $category['link_rewrite'])).'" title="'.htmlentities($category['name'], ENT_NOQUOTES, 'UTF-8').'" />').'<meta itemprop="name" content="'.htmlentities($category['name'], ENT_NOQUOTES, 'UTF-8').'" />'.
                    htmlentities($category['name'], ENT_NOQUOTES, 'UTF-8').
                    (($n < $n_categories || $link_on_the_item) ? '</a>' : '').
                    (($n++ != $n_categories || !empty($path)) ? '<span class="navigation-pipe">'.$pipe.'</span>' : '').'</span>';
                }
                return $full_path.$path;
            }
        }
        else if ($category_type === 'CMS')
        {
            $category = new CMSCategory($id_category, $context->language->id);
            if (!Validate::isLoadedObject($category))
                die(Tools::displayError());
            $category_link = $context->link->getCMSCategoryLink($category);
            if ($path != $category->name)
                $full_path .= '<a href="'.Tools::safeOutput($category_link).'">'.htmlentities($category->name, ENT_NOQUOTES, 'UTF-8').'</a><span class="navigation-pipe">'.$pipe.'</span>'.$path;
            else
                $full_path = ($link_on_the_item ? '<a href="'.Tools::safeOutput($category_link).'">' : '').htmlentities($path, ENT_NOQUOTES, 'UTF-8').($link_on_the_item ? '</a>' : '');
            return Tools::getPath($category->id_parent, $full_path, $link_on_the_item, $category_type);
        }
    }
}

/override/controllers/ProductController.php

<?php

class ProductController extends ProductControllerCore
{

    protected function assignCategory()
    {
        // Assign category to the template
        if ($this->category !== false && Validate::isLoadedObject($this->category) && $this->category->inShop() && $this->category->isAssociatedToShop()) {
            $this->category = new Category((int)$this->product->id_category_default, (int)$this->context->language->id);
            $path = Tools::getPath($this->product->id_category_default, $this->product->name, true);
        } elseif (Category::inShopStatic($this->product->id_category_default, $this->context->shop)) {
            $this->category = new Category((int)$this->product->id_category_default, (int)$this->context->language->id);
            if (Validate::isLoadedObject($this->category) && $this->category->active && $this->category->isAssociatedToShop()) {
                $path = Tools::getPath((int)$this->product->id_category_default, $this->product->name);
            }
        }
        if (!isset($path) || !$path) {
            $this->category = new Category((int)$this->product->id_category_default, (int)$this->context->language->id);
            $path = Tools::getPath($this->product->id_category_default, $this->product->name, true);
        }

        $sub_categories = array();
        if (Validate::isLoadedObject($this->category)) {
            $sub_categories = $this->category->getSubCategories($this->context->language->id, true);

            // various assignements before Hook::exec
            $this->context->smarty->assign(array(
                'path' => $path,
                'category' => $this->category,
                'subCategories' => $sub_categories,
                'id_category_current' => (int)$this->category->id,
                'id_category_parent' => (int)$this->category->id_parent,
                'return_category_name' => Tools::safeOutput($this->category->getFieldByLang('name')),
                'categories' => Category::getHomeCategories($this->context->language->id, true, (int)$this->context->shop->id)
            ));
        }
        $this->context->smarty->assign(array('HOOK_PRODUCT_FOOTER' => Hook::exec('displayFooterProduct', array('product' => $this->product, 'category' => $this->category))));
    }

}

 

Edited November 12, 2017 by trace
1. "position" starts at 1; 2. breadcramps path on product page is now based on the default category of product; 3. All "display:none;" changed to <meta> (see edit history)

[trace]

Use Structured Data Testing Tool for check result.

[mpatzekov]

Hi, trace. Is there any option to start the counter of the position property from 1 instead of 0? 

[trace]

Change this string in Tools.php:

$key = $key+1;

to:

$key = $key+2;

and in breadcrumb.tpl:

<meta itemprop="position" content="0">

to:

<meta itemprop="position" content="1">

But for what you need it? I watched Google's instructions and there the countdown started at 0.

[mpatzekov]

Hey, trace... Many thanks on the assistance, I really appreciate it. Well, this is interesting... I am sure that there may be some recommendations that give the 0 as a starting position. Actually, I haven't checked if there are examples in schema.org. What I've found is this: https://developers.google.com/search/docs/data-types/breadcrumbs and in all the examples (see markup buttons), the starting position is 1, so that's why I assumed that I should use 1 instead of 0. What do you think, is it possible that I may be wrong?