magento2 unable to override custom search engine- getting blank page

Question

here is my full di.xml

 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

<preference for="Magento\Catalog\Block\Product\ProductList\Toolbar" type="Vendor\Module\Block\Catalog\Product\ProductList\Toolbar" />    

<preference for="Magento\LayeredNavigation\Block\Navigation" type="Vendor\Module\Block\CatalogSearch\Layer" />

<preference for="Magento\Catalog\Model\ResourceModel\Product\Collection" type="Vendor\Module\Model\Catalog\Resource\Product\Collection" />

</config>

In Vendor\Module\Model\Engine.php

$current_list_mode = $this->layout->createBlock('Vendor\Module\Block\Catalog\Product\ProductList\Toolbar')->getCurrentMode();

In \Vendor\Module\Block\Catalog\Product\ProductList\Toolbar.php

namespace Vendor\Module\Block\Catalog\Product\ProductList;

use Magento\Catalog\Helper\Product\ProductList;
use Magento\Catalog\Model\Product\ProductList\Toolbar as ToolbarModel;
use Magento\Framework\View\Element\Template;
use Magento\Framework\Registry;

class Toolbar extends \Magento\Catalog\Block\Product\ProductList\Toolbar
{
    protected $tglssearchHelper;

public function __construct(
    /* passing all Constructors parameters to the parent class -Magento\Catalog\Block\Product\ProductList\Toolbar.php*/
    \Magento\Framework\View\Element\Template\Context $context,
     \Magento\Catalog\Model\Session $catalogSession,
    \Magento\Catalog\Model\Config $catalogConfig,
    ToolbarModel $toolbarModel,
    \Magento\Framework\Url\EncoderInterface $urlEncoder,
    ProductList $productListHelper,
    \Magento\Framework\Data\Helper\PostHelper $postDataHelper,
    \Vendor\Module\Helper\Data $tglssearchHelper,      
    \Magento\Framework\Registry $registry,
    array $data = []
)  {
        $this->tglssearchHelper = $tglssearchHelper;
        $this->_catalogSession = $catalogSession;
        $this->_catalogConfig = $catalogConfig;
        $this->_toolbarModel = $toolbarModel;
        $this->_urlEncoder = $urlEncoder;
        $this->_productListHelper = $productListHelper;
        $this->_postDataHelper = $postDataHelper;
        $this->_registry = $registry;


        parent::__construct($context,$catalogSession,$catalogConfig,$toolbarModel,$urlEncoder,$productListHelper,$postDataHelper,$data);
   }

  public function getAvailableOrders()
{
    echo 'availablOrders';

}

But still im not able to override the custom block for my custom search engine:( my layout file name : catalogsearch_catalogsearch_resultcontroller.xml

Controller path is: Vendor\Module\Controller\CatalogSearch\ResultController

My system.log says:

Cache file with merged layout: LAYOUT_frontend_STORE1_3d41d8cd98f00b204e9800998ecf8427e and handles : Please correct the XML data and try again. [] []

I get a blank page when i search for the products. please help where am i wrong!!

Answer 1

Custom block calling in di.xml Preference is like

<preference for="Magento\Catalog\Block\Product\ProductList\Toolbar" type="Vendor\Module\Block\Catalog\Product\ProductList\Toolbar" />

I tried it is working

di.xml

<preference for="Magento\Catalog\Block\Product\ProductList\Toolbar" type="Vendor\Module\Block\Test" />

Custom Block

namespace Vendor\Module\Block;

    class Test extends \Magento\Catalog\Block\Product\ProductList\Toolbar
    {
         public function getAvailableOrders()
         {
              echo 'test';
              exit;
         }
    }

Then ran php magento setup:upgrade, I run the product list page ...:)

Hope this helps.