Set cookie in Observer Not working when full page Cache is enabled

Question

I have to set category id in cookie when customer go to Category page and update cookie with category id when visit again using seperate module.

I have created Observer and set cookie there but not working. I have checked Observer is calling and also getting correct category ID.

Issue is with Cache. if Cache is enabled all is working fine.

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="catalog_controller_category_init_after">

    <observer name="cookieObserver" instance="Vendor\Module\Observer\Category\Data" />

</event>

</config>

Observer - Data.php

<?php
namespace Vendor\Module\Observer\Category;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

use Magento\Framework\Stdlib\Cookie\CookieMetadataFactory;
use Magento\Framework\Stdlib\CookieManagerInterface;


class Data implements ObserverInterface
{

const COOKIE_NAME = 'categoryId';
const COOKIE_DURATION = 86400; // One day (86400 seconds)

protected $cookieManager;

/**
 * @var CookieMetadataFactory
 */
protected $cookieMetadataFactory;

public function __construct(
    CookieManagerInterface $cookieManager,
    CookieMetadataFactory $cookieMetadataFactory
)
{
    $this->cookieManager = $cookieManager;
    $this->cookieMetadataFactory = $cookieMetadataFactory;
}

/**

 * Below is the method that will fire whenever the event runs!

 *

 * @param Observer $observer

 */

public function execute(Observer $observer)
{
    $data = $observer->getData();
    $metadata = $this->cookieMetadataFactory->createPublicCookieMetadata()->setDuration(86400)->setPath('/');
    $this->cookieManager->setPublicCookie('categoryId', $data['category']->getId(), $metadata);

return $this; }

}

Please provide some suggestion or help.

Answer 1

You can use event, observer to create/update/delete cookie when some visiting category page.

You can use the event catalog_controller_category_init_after or any other event like layout_load_before.

/* Set cookie */

$categoryId       = 'Category ID'
$objectManager    = \Magento\Framework\App\ObjectManager::getInstance();
$cookieManager    = $objectManager->create('\Magento\Framework\Stdlib\CookieManagerInterface');
$cookieMetadataFactory = $objectManager->create('\Magento\Framework\Stdlib\Cookie\CookieMetadataFactory');
$metadata         = $cookieMetadataFactory
                    ->createPublicCookieMetadata()
                    ->setDuration(1800)
                    ->setPath('/');
$cookieManager->setPublicCookie(
    'categoryId',
    $categoryId,
    $metadata
);


/* Retrive the cookie values */

$cookieManager    = $objectManager->create('\Magento\Framework\Stdlib\CookieManagerInterface');
$cookieValue      = $cookieManager->getCookie('categoryId');

You can follow manual to create a custom extension