get layer navigation data available in product collection ( current category , search product ) .
To get layer navigation from the API
public function __construct(\Magento\Framework\Webapi\Rest\Request
$request){
$this->_request = $request;
}
/**
* Retrieve filterlist
*
* @api
* @return array
*/
public function retrieve(){
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$category = $obj->create('Magento\Catalog\Model\Category')->load($this->_request->getParam('categoryId'));
$filterableAttributes = $objectManager->getInstance()->get(\Magento\Catalog\Model\Layer\Category\FilterableAttributeList::class);
$appState = $objectManager->getInstance()->get(\Magento\Framework\App\State::class);
$layerResolver = $objectManager->getInstance()->get(\Magento\Catalog\Model\Layer\Resolver::class);
$filterList = $objectManager->getInstance()->create(
\Magento\Catalog\Model\Layer\FilterList::class,
[
'filterableAttributes' => $filterableAttributes
]
);
$layer = $layerResolver->get();
$layer->setCurrentCategory($category);
$filters = $filterList->getFilters($layer);
$maxPrice = $layer->getProductCollection()->getMaxPrice();
$minPrice = $layer->getProductCollection()->getMinPrice();
$i = 0;
foreach($filters as $filter)
{
$availablefilter = $filter->getRequestVar(); //Gives the request param name such as 'cat' for Category, 'price' for Price
$availablefilter = (string)$filter->getName(); //Gives Display Name of the filter such as Category,Price etc.
$items = $filter->getItems(); //Gives all available filter options in that particular filter
$filterValues = array();
$j = 0;
foreach($items as $item)
{
$filterValues[$j]['display'] = strip_tags($item->getLabel());
$filterValues[$j]['value'] = $item->getValue();
$filterValues[$j]['count'] = $item->getCount(); //Gives no. of products in each filter options
$j++;
}
if(!empty($filterValues) && count($filterValues)>1)
{
$filterArray['availablefilter'][$availablefilter] = $filterValues;
}
$i++;
}
echo json_encode($filterArray);
exit;
}Sample Output will be :
{
"availablefilter": {
"Climate": [
{
"display": "All-Weather",
"value": "202",
"count": "1"
},
{
"display": "Cool",
"value": "204",
"count": "1"
}
],
"Manufacturer": [
{
"display": "Azzedine Alaïa",
"value": "216",
"count": "1"
},
{
"display": "Balenciaga",
"value": "217",
"count": "1"
}
],
"Material": [
{
"display": "Cotton",
"value": "33",
"count": "1"
},
{
"display": "Nylon",
"value": "37",
"count": "1"
}
],