Magento 2: How can i change page layout using Block file

Question

I need to change search page layout 1-column while Search page is empty. any idea please share.

Answer 1

you can update the page layout for empty result page by observing controller_action_layout_render_before event in your custom module as below.

app/code/{Namespace}/{Module}/etc/events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
 <event name="controller_action_layout_render_before">
 <observer name="layout_render_before" instance="{Namespace}\{Module}\Observer\LayoutRenderBefore" />
 </event>
</config>

app/code/{Namespace}/{Module}/Observer/LayoutRenderBefore.php

<?php
namespace {Namespace}\{Module}\Observer;
class LayoutRenderBefore implements \Magento\Framework\Event\ObserverInterface
{
 protected $_resultPageFactory;
 public function __construct(\Magento\Framework\View\Result\PageFactory $resultPageFactory) {
 $this->_resultPageFactory = $resultPageFactory;
 }
 public function execute(\Magento\Framework\Event\Observer $observer)
 {
 $resultPage = $this->_resultPageFactory->create();
 $block = $resultPage->getLayout()->getBlock('search.result');
 if ($block instanceof \Magento\CatalogSearch\Block\Result && !$block->getResultCount()) {
 $pageConfig = $resultPage->getConfig();
 $pageConfig->setPageLayout('1column');
 }
 }
}

• Dhaval Vaghela: Thank for your help.
• Shyam: Happy to hear that it worked for you.
• Dhaval Vaghela: Using above codes selected attribute result showing two times in left panel. Any idea bout this.
• Dhaval Vaghela: Below line is affect for that : $resultPage = $this->_resultPageFactory->create()