The following below steps to create custom module using Events & Observer
Step [1] – Nominate Module Name ::
Syntax as below
Namespace_Modulename =Mage2db_John
Magento2 Root Directory / app /code / Mage2db / JohnStep [2] – Create a module’s registration file :: This file name is registration.php & used to registered module.
File Path as below
Magento2 Root Directory / app /code / Mage2db / John / registration.phpWrite below code in registration.php
<?php
\Magento\Framework\Component\ComponentRegistrar::register(
\Magento\Framework\Component\ComponentRegistrar::MODULE,
'Mage2db_John',
__DIR__
);Step [3] – Create a module’s naming configuration file :: This file name is module.xml & used to define module name
File Path as below
Magento2 Root Directory / app /code / Mage2db / John / etc / module.xmlWrite below code in module.xml
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Mage2db_John" setup_version="1.0.0"/>
</config>Step [4] – Create a events.xml file to define events, observer & it’ file
File Path as below
Magento2 Root Directory / app /code / Mage2db / John / etc / events.xmlWrite below code in events.xml to define events
<?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="checkout_cart_product_add_after">
<observer name="checkout_cart_product_add_after_customprice" instance="Mage2db\John\Observer\Product\Data" />
</event>
</config>Event Name=checkout_cart_product_add_after
Observer Name =checkout_cart_product_add_after_customprice
Custom Observer File Path= Mage2db\John\Observer\Product\Data
inside path referring file = Data.php
Step [5] – Create Observer
Create a data.php file
File Path as below
Magento2 Root Directory / app /code / Mage2db / John / Observer / Product / Data.phpWrite below code in data.php to override core functionality of Product Model (to increase product price)
<?php
namespace Mage2db\John\Observer\Product;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
class Data implements ObserverInterface
{
public function execute(Observer $observer)
{
$item = $observer->getEvent()->getData('quote_item');
$item = ( $item->getParentItem() ? $item->getParentItem() : $item );
$price = 400;
$item->setCustomPrice($price);
$item->setOriginalCustomPrice($price);
$item->getProduct()->setIsSuperMode(true);
}
}Step [7] – Finally run below CLI command & changes would be reflected as below & changes will be reflected, once products added to Shopping Cart.
php bin/magento setup:upgrade && php bin/magento setup:static-content:deploy -f && php bin/magento indexer:reindex && php bin/magento cache:flush
Joust Duffle Bag (SKU 24-MB01) It is price INR 90 , once added to Shopping Cart, It price converted INR 300
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