Magento2: Add new Field in Cart page and Save in order?

Question

I want to Add new Field "Remark" in Cart Items Page. it is a purpose to "Remark" for product. When i save cart(Update cart) it will be saved in Quote items table. also "Procced To checkout" It will be saved in order detials. Also view in admin side

Answer 1

Magento provides additional attribute functionality to pass additional data. On cart page, create input field for remark then in custom module's events.xml, create an observer like below :

<?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="customremark" instance="Companyname\Modulename\Observer\customremark" />
    </event>

</config>

Then in observer, you can get this remark field from request

<?php

namespace Companyname\Modulename\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\RequestInterface;

class SetAdditionalOptions implements ObserverInterface
{
    /**
     * @var RequestInterface
     */
    protected $_request;

    /**
     * @param RequestInterface $request
     */
    public function __construct(
        RequestInterface $request
    ) {
        $this->_request = $request;
    }

    /**
     * @param \Magento\Framework\Event\Observer $observer
     */
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        // Check and set information according to your need
        if ($this->_request->getFullActionName() == 'checkout_cart_add') { //checking when product is adding to cart
            $product = $observer->getProduct();
            $additionalOptions = [];
            $additionalOptions[] = array(
                'label' => "Remark",
                'value' => "Your Information",
            );
            $observer->getProduct()->addCustomOption('additional_options', serialize($additionalOptions));
        }
    }
}

Hope this helps.