Author: m@g3m@nk3y$

To add custom conditions to product collection, you need to override build() function.  I hope you have a custom module with basic skeletons like registration.php and module.xml file,

Path: app/code/Magemonkeys/FilterSearch/etc/frontend/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">
    <!-- Magento Catalog search module's IndexBuilder.php plugin file -->
    <type name="MagentoCatalogSearchModelSearchIndexBuilder">
        <plugin name="Magemonkeys_FilterSearch::custom_filterSearchr_conditions"
                type="MagemonkeysFilterSearchPluginCatalogSearchModelSearchIndexBuilder" />
    </type>
</config>

Path: app/code/Magemonkeys/FilterSearch/Plugin/CatalogSearch/Model/Search/IndexBuilder.php

<?php
namespace MagemonkeysFilterSearchPluginCatalogSearchModelSearch;

use MagentoFrameworkSearchRequestInterface;

class IndexBuilder
{

    public function __construct(
        MagentoStoreModelStoreManagerInterface $storeManager,
        MagentoCatalogModelResourceModelProductCollectionFactory $productCollectionFactory
    ) {
        $this->storeManager = $storeManager;
        $this->_productCollectionFactory = $productCollectionFactory;
    }

    public function aroundBuild(MagentoCatalogSearchModelSearchIndexBuilder $subject, callable $proceed, RequestInterface $request)
    {
        $select = $proceed($request);
        /* customization by magemonkeys */
        	$storeId = $this->storeManager->getStore()->getStoreId();
            $query = 'WHERE_CUSTOM_CONDITION';
            $select->where($query);
        /* customization by magemonkeys end here */
        return $select;
    }

}

As per my requirements, I have created this type of controller. So basically you need 2 types of Controller.

The first one for adding the product in the comparison list and second for removing the product from the comparison list.

Step 1. Please create one controller for Add Product as below.

<?php

namespace MagemonkeysCompareajaxControllerIndex;

use MagentoCatalogApiProductRepositoryInterface;
use MagentoFrameworkDataFormFormKeyValidator;
use MagentoFrameworkViewResultPageFactory;
use MagentoFrameworkControllerResultJsonFactory;
use MagentoFrameworkExceptionNoSuchEntityException;
use MagentoFrameworkEventManagerInterface as EventManager;

class AddCompare extends MagentoFrameworkAppActionAction
{
    /**
     * @var JsonFactory
     */
    protected $resultJsonFactory;

    /**
    * @var EventManager
    */
    private $eventManager;

    /**
     * Customer id
     *
     * @var null|int
     */
    protected $_customerId = null;

    /**
     * Catalog session
     *
     * @var MagentoCatalogModelSession
     */
    protected $_catalogSession;

    /**
     * Catalog product compare list
     *
     * @var MagentoCatalogModelProductCompareListCompare
     */
    protected $_catalogProductCompareList;

    /**
     * Customer visitor
     *
     * @var MagentoCustomerModelVisitor
     */
    protected $_customerVisitor;

    /**
     * Customer session
     *
     * @var MagentoCustomerModelSession
     */
    protected $_customerSession;

    /**
     * Item collection factory
     *
     * @var MagentoCatalogModelResourceModelProductCompareItemCollectionFactory
     */
    protected $_itemCollectionFactory;

    /**
     * Compare item factory
     *
     * @var MagentoCatalogModelProductCompareItemFactory
     */
    protected $_compareItemFactory;

    /**
     * @var MagentoStoreModelStoreManagerInterface
     */
    protected $_storeManager;

    /**
     * @var Validator
     */
    protected $_formKeyValidator;

    /**
     * @var MagentoFrameworkViewResultPageFactory
     */
    protected $resultPageFactory;

    /**
     * @var ProductRepositoryInterface
     */
    protected $productRepository;

    protected $_compareHelper;

    protected $_urlInterface;

    protected $_blockFactory;

    public function __construct(
        MagentoFrameworkAppActionContext $context,
        MagentoCatalogModelProductCompareItemFactory $compareItemFactory,
        MagentoCatalogModelResourceModelProductCompareItemCollectionFactory $itemCollectionFactory,
        MagentoCustomerModelSession $customerSession,
        MagentoCustomerModelVisitor $customerVisitor,
        MagentoCatalogModelProductCompareListCompare $catalogProductCompareList,
        MagentoCatalogModelSession $catalogSession,
        MagentoStoreModelStoreManagerInterface $storeManager,
        Validator $formKeyValidator,
        PageFactory $resultPageFactory,
        ProductRepositoryInterface $productRepository,
        JsonFactory $resultJsonFactory,
        EventManager $eventManager,
        MagentoCatalogHelperProductCompare $compareHelper,
        MagentoFrameworkUrlInterface $urlInterface,
        MagentoFrameworkViewElementBlockFactory $blockFactory
    ) {
        $this->resultJsonFactory = $resultJsonFactory;
        $this->_storeManager = $storeManager;
        $this->_compareItemFactory = $compareItemFactory;
        $this->_itemCollectionFactory = $itemCollectionFactory;
        $this->_customerSession = $customerSession;
        $this->_customerVisitor = $customerVisitor;
        $this->_catalogProductCompareList = $catalogProductCompareList;
        $this->_catalogSession = $catalogSession;
        $this->_formKeyValidator = $formKeyValidator;
        $this->resultPageFactory = $resultPageFactory;
        $this->productRepository = $productRepository;
        $this->eventManager = $eventManager;
        $this->_compareHelper = $compareHelper;
        $this->_urlInterface = $urlInterface;
        $this->_blockFactory = $blockFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $resultJson = $this->resultJsonFactory->create();

        $result = array();
        $error = true;
        $message = '';

        // TODO: Validate this is a POST request.

        $count = $this->_compareHelper->getItemCount();
        if($count >= 4) {
            $message = __('You can add the compared products under 4 item(s)');
            $error = true;
            return $resultJson->setData([
                'message' => $message,
                'data' => $result,
                'error' => $error
            ]);
        }

        $productId = (int)$this->getRequest()->getParam('product');
        if ($productId && ($this->_customerVisitor->getId() || $this->_customerSession->isLoggedIn())) {
            $storeId = $this->_storeManager->getStore()->getId();
            try {
                $product = $this->productRepository->getById($productId, false, $storeId);
            } catch (NoSuchEntityException $e) {
                $product = null;
                $message = __('Product does not exist');
                $error = true;
            }

            if ($product) {
                $this->_catalogProductCompareList->addProduct($product);
                $this->_eventManager->dispatch('catalog_product_compare_add_product', ['product' => $product]);
            }

            $this->_objectManager->get('MagentoCatalogHelperProductCompare')->calculate();
            $html = '';
            if($this->_compareHelper->hasItems()){ 
                $compItem = $this->_compareHelper->getItemCollection();
                $i = 1;
                $responseArray = array();
                foreach($compItem->getData() as $comitem){
                    $productNew = $this->_objectManager->get('MagentoCatalogModelProduct')->load($comitem['entity_id']);
                    $imageBlock = $this->_blockFactory->createBlock('MagentoCatalogBlockProductListProduct');
                    $productImage = $imageBlock->getImage($productNew, 'product_comparison_list');
                    $imageUrl = $productImage->getImageUrl();
                    $responseArray[$i]['id'] = $comitem["entity_id"];
                    $responseArray[$i]['url'] = $imageUrl;
                    $i++;
                }

                for ($j = 1; $j <= 4; $j++)
                {
                    if(isset($responseArray[$j]))
                    {
                        $html .= '<div class="compare-item active" data-itemid="'.$responseArray[$j]['id'].'">
                            <div class="compare-item-number">'. $j .'</div>
                            <a class="compare-item-remove removecompareajaxlink" href="javascript:void(0)" data-productid="'.$responseArray[$j]['id'].'" data-url="'. $this->_urlInterface->getUrl().'compareajax/index/removeCompare/product/'.$responseArray[$j]['id'] .'?isAjax=true"><i class="fa fa-remove"></i></a>
                            <img src="'. $responseArray[$j]['url'] .'" class="imageCompare" />
                        </div>';
                    }
                    else
                    {
                        $html .= '<div class="compare-item active" data-itemid="">
                            <div class="compare-item-number">'. $j .'</div>
                        </div>';
                    }
                }
            }
            $message = __('Product successfully added in comparison list');
            $result = array('html'=>$html,'id'=>$productId);
            $error = false;
        }

        return $resultJson->setData([
                    'message' => $message,
                    'data' => $result,
                    'error' => $error
        ]);
    }
}

Step 2. Please create another controller for removing the product as below.

<?php

namespace MagemonkeysCompareajaxControllerIndex;

use MagentoCatalogApiProductRepositoryInterface;
use MagentoFrameworkDataFormFormKeyValidator;
use MagentoFrameworkViewResultPageFactory;
use MagentoFrameworkControllerResultJsonFactory;
use MagentoFrameworkExceptionNoSuchEntityException;
use MagentoFrameworkEventManagerInterface as EventManager;

class RemoveCompare extends MagentoFrameworkAppActionAction
{
    /**
     * @var JsonFactory
     */
    protected $resultJsonFactory;

    /**
    * @var EventManager
    */
    private $eventManager;

    /**
     * Customer id
     *
     * @var null|int
     */
    protected $_customerId = null;

    /**
     * Catalog session
     *
     * @var MagentoCatalogModelSession
     */
    protected $_catalogSession;

    /**
     * Catalog product compare list
     *
     * @var MagentoCatalogModelProductCompareListCompare
     */
    protected $_catalogProductCompareList;

    /**
     * Customer visitor
     *
     * @var MagentoCustomerModelVisitor
     */
    protected $_customerVisitor;

    /**
     * Customer session
     *
     * @var MagentoCustomerModelSession
     */
    protected $_customerSession;

    /**
     * Item collection factory
     *
     * @var MagentoCatalogModelResourceModelProductCompareItemCollectionFactory
     */
    protected $_itemCollectionFactory;

    /**
     * Compare item factory
     *
     * @var MagentoCatalogModelProductCompareItemFactory
     */
    protected $_compareItemFactory;

    /**
     * @var MagentoStoreModelStoreManagerInterface
     */
    protected $_storeManager;

    /**
     * @var Validator
     */
    protected $_formKeyValidator;

    /**
     * @var MagentoFrameworkViewResultPageFactory
     */
    protected $resultPageFactory;

    /**
     * @var ProductRepositoryInterface
     */
    protected $productRepository;

    protected $_compareHelper;

    protected $_urlInterface;

    protected $_blockFactory;

    public function __construct(
        MagentoFrameworkAppActionContext $context,
        MagentoCatalogModelProductCompareItemFactory $compareItemFactory,
        MagentoCatalogModelResourceModelProductCompareItemCollectionFactory $itemCollectionFactory,
        MagentoCustomerModelSession $customerSession,
        MagentoCustomerModelVisitor $customerVisitor,
        MagentoCatalogModelProductCompareListCompare $catalogProductCompareList,
        MagentoCatalogModelSession $catalogSession,
        MagentoStoreModelStoreManagerInterface $storeManager,
        Validator $formKeyValidator,
        PageFactory $resultPageFactory,
        ProductRepositoryInterface $productRepository,
        JsonFactory $resultJsonFactory,
        EventManager $eventManager,
        MagentoCatalogHelperProductCompare $compareHelper,
        MagentoFrameworkUrlInterface $urlInterface,
        MagentoFrameworkViewElementBlockFactory $blockFactory
    ) {
        $this->resultJsonFactory = $resultJsonFactory;
        $this->_storeManager = $storeManager;
        $this->_compareItemFactory = $compareItemFactory;
        $this->_itemCollectionFactory = $itemCollectionFactory;
        $this->_customerSession = $customerSession;
        $this->_customerVisitor = $customerVisitor;
        $this->_catalogProductCompareList = $catalogProductCompareList;
        $this->_catalogSession = $catalogSession;
        $this->_formKeyValidator = $formKeyValidator;
        $this->resultPageFactory = $resultPageFactory;
        $this->productRepository = $productRepository;
        $this->eventManager = $eventManager;
        $this->_compareHelper = $compareHelper;
        $this->_urlInterface = $urlInterface;
        $this->_blockFactory = $blockFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $resultJson = $this->resultJsonFactory->create();

        $result = array();
        $error = true;
        $message = '';

        // TODO: Validate this is a POST request.

        $productId = (int)$this->getRequest()->getParam('product');
        if ($productId) {
            $storeId = $this->_storeManager->getStore()->getId();
            try {
                $product = $this->productRepository->getById($productId, false, $storeId);
            } catch (NoSuchEntityException $e) {
                $product = null;
                $message = __('Product does not exist');
                $error = true;
            }

            if ($product) {
                $item = $this->_compareItemFactory->create();
                if ($this->_customerSession->isLoggedIn()) {
                    $item->setCustomerId($this->_customerSession->getCustomerId());
                } elseif ($this->_customerId) {
                    $item->setCustomerId($this->_customerId);
                } else {
                    $item->addVisitorId($this->_customerVisitor->getId());
                }

                $item->loadByProduct($product);

                if ($item->getId()) {
                    $item->delete();
                    $productName = $this->_objectManager->get(MagentoFrameworkEscaper::class)
                        ->escapeHtml($product->getName());
                    $message = __('You removed product %1 from the comparison list.', $productName);
                    $this->_eventManager->dispatch('catalog_product_compare_remove_product',['product' => $item]);
                    $this->_objectManager->get('MagentoCatalogHelperProductCompare')->calculate();
                }

                $html = '';
                if($this->_compareHelper->hasItems()){ 
                    $compItem = $this->_compareHelper->getItemCollection();
                    $i = 1;
                    $responseArray = array();
                    foreach($compItem->getData() as $comitem){
                        $productNew = $this->_objectManager->get('MagentoCatalogModelProduct')->load($comitem['entity_id']);
                        $imageBlock = $this->_blockFactory->createBlock('MagentoCatalogBlockProductListProduct');
                        $productImage = $imageBlock->getImage($productNew, 'product_comparison_list');
                        $imageUrl = $productImage->getImageUrl();
                        $responseArray[$i]['id'] = $comitem["entity_id"];
                        $responseArray[$i]['url'] = $imageUrl;
                        $i++;
                    }

                    for ($j = 1; $j <= 4; $j++)
                    {
                        if(isset($responseArray[$j]))
                        {
                            $html .= '<div class="compare-item active" data-itemid="'.$responseArray[$j]['id'].'">
                                <div class="compare-item-number">'. $j .'</div>
                                <a class="compare-item-remove removecompareajaxlink" href="javascript:void(0)" data-productid="'.$responseArray[$j]['id'].'" data-url="'. $this->_urlInterface->getUrl().'compareajax/index/removeCompare/product/'.$responseArray[$j]['id'] .'?isAjax=true"><i class="fa fa-remove"></i></a>
                                <img src="'. $responseArray[$j]['url'] .'" class="imageCompare" />
                            </div>';
                        }
                        else
                        {
                            $html .= '<div class="compare-item active" data-itemid="">
                                <div class="compare-item-number">'. $j .'</div>
                            </div>';
                        }
                    }
                }
                $message = __('You removed product from the comparison list.');
                $result = array('html'=>$html,'id'=>$productId);
                $error = false;
            }

        }

        return $resultJson->setData([
                    'message' => $message,
                    'data' => $result,
                    'error' => $error
        ]);
    }
}

You can execute and modify these controllers as per your requirements.

Please follow below steps to assign order item value from the quote item.

step 1) Create a di.xml under app/code/Vendor/Module/etc/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">
    <type name="MagentoQuoteModelQuoteItemToOrderItem">
        <plugin name="vendor_mymodule_sales_quote_item_order_item" type="VendorModulePluginSetOrderItemValue" />
    </type>    
</config>

step 2) Create the plugin file app/code/Vendor/Module/Plugin/SetOrderItemValue.php

<?php
namespace VendorModulePlugin;
use MagentoFrameworkSerializeSerializerInterface;

class SetOrderItemValue
{
    public function aroundConvert(MagentoQuoteModelQuoteItemToOrderItem $subject, callable $proceed, $quoteItem, $data)
    {
        $orderItem = $proceed($quoteItem, $data);
        $quotecustomattribute = $quoteItem->getMyCustomAttribite();
        $orderItem->setMyCustomAttribite($quotecustomattribute);
        return $orderItem;
    }
}

By using the below code, we can get customer group multi-select option with the help of system.xml.

We can get all Customer group by system.xml in System -> Configuration Section of admin.

Create system.xml file,
Path, app/code/Magemonkeys/Customer/etc/adminhtml/system.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="catalog">
            <group id="customer_group" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <field id="list" translate="label" type="multiselect" sortOrder="3" showInDefault="1" showInWebsite="1" showInStore="0">
                    <label>Customer Groups</label>
                    <source_model>MagemonkeysCustomerModelAdminhtmlSystemConfigSourceCustomerGroup</source_model>
                    <can_be_empty>1</can_be_empty>
                </field>
            </group>
        </section>
    </system>
</config>

You need to get  all customer group using a Model file

Create Group.php file,
Path, app/code/Magemonkeys/Customer/Model/Adminhtml/System/Config/Source/Customer/Group.php

<?php
namespace MagemonkeysCustomerModelAdminhtmlSystemConfigSourceCustomer;

class Group implements MagentoFrameworkOptionArrayInterface
{
    public function __construct(MagentoCustomerModelResourceModelGroupCollectionFactory $groupCollectionFactory)
    {
        $this->_groupCollectionFactory = $groupCollectionFactory;
    }

    /**
     * @return array
     */
    public function toOptionArray()
    {
        if (!$this->_options) {
            $this->_options = $this->_groupCollectionFactory->create()->loadData()->toOptionArray();
        }
        return $this->_options;
    }
}

Clear Cache using php bin/magento cache:flush

‘Contact Us’ page is one of the essential things you can see in various companies or websites having established products, services, or brand names.

Via contact page, customers and visitors send inquiries, messages, or emails. It enables you, for the most part, to be customers in contact with you.

You can customize the ‘Contact Us’ page available in Magento 2 as per your requirements.

‘Contact Us’ page set up:

• The first step is to go to ‘Admin Panel’ in Magento.
• Now, go to store – Configuration – General – Contacts.
• After the setting screen appears, make necessary changes.

To enable the ‘Contact Us’ page on the storefront, select ‘yes’ option.

Email Options:

1. Send Emails to: Please note the email address in this field to which you would like to receive all the emails sent using the contact us form.

2. Email Sender: Pick the name that you want to see as a sender.

3. Email Template: You can use any email template to send messages or emails.

4. And finally, click on ‘save config’ to enable the changes.

Customizing ‘Contact Us’ page:

1. Go to Content > Blocks.

2. In the Blocks page, go to Action Menu and click on Edit option for ‘Contact Us’.

3. Now go to the content box and make necessary changes to appear on the ‘Contact Us’ page.

4. Click on ‘Save Block’ to finish your customization.

After you finish all of the above steps, you have completed the configuration of the ‘Contact Us’ page in Magento 2.

Magento provides so many default fields but If we need custom information in customer address then we can create a new customer_address type attribute.

In this article, I will share how we can add text type attribute in Customer Address,

You need to create InstallData.php file in your existing module or you can create a new module as well as,

If you are creating in your existing module: app/code/[Vendor Name]/[Module Name]/Setup/InstallData.php

<?php
namespace [Vendor Name]/[Module Name]Setup;
 
use MagentoCustomerSetupCustomerSetupFactory;
use MagentoEavModelEntityAttributeSet as AttributeSet;
use MagentoEavModelEntityAttributeSetFactory as AttributeSetFactory;
use MagentoFrameworkSetupInstallDataInterface;
use MagentoFrameworkSetupModuleContextInterface;
use MagentoFrameworkSetupModuleDataSetupInterface;
 
class InstallData implements InstallDataInterface
{	
	/**
     * @var CustomerSetupFactory
     */
    private $customersetupFactory;
 	
 	/**
     * @var AttributeSetFactory
     */
    private $attributesetFactory;
 	
 	/**
     * @param CustomerSetupFactory $customersetupFactory
     * @param AttributeSetFactory $attributesetFactory
     */
    public function __construct(
        CustomerSetupFactory $customersetupFactory,
        AttributeSetFactory $attributesetFactory
    ) {
        $this->customersetupFactory = $customersetupFactory;
        $this->attributesetFactory = $attributesetFactory;
    }
 
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
 
        $customerSetup = $this->customersetupFactory->create(['setup' => $setup]);
        $customerEntity = $customerSetup->getEavConfig()->getEntityType('customer');
        $attributeSetId = $customerEntity->getDefaultAttributeSetId();
        $attributeSet = $this->attributesetFactory->create();
        $attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);
 
        $customerSetup->addAttribute('customer_address', 'job_title', [
            'type' => 'varchar',
            'label' => 'Job Title',
            'input' => 'text', //You can change your input type as per your requirement
            'required' => false, //If You need this field is required in customer address area then you can just set "true" in stand of "false"
            'visible' => true,
            'user_defined' => true,
            'sort_order' => 1000,
            'position' => 1000,
            'system' => 0,
        ]);
 
        $attribute = $customerSetup->getEavConfig()->getAttribute('customer_address', 'job_title')
            ->addData([
                'attribute_set_id' => $attributeSetId,
                'attribute_group_id' => $attributeGroupId,
                'used_in_forms' => ['adminhtml_customer_address'], //Other list of forms: customer_address_edit, customer_register_address where you want to display the custom attribute 
            ]);
 
        $attribute->save();
    }
}

After creating the above file you have to run below commands:

php bin/magento setup:upgrade
php bin/magento cache:clean

Now you can check in the customer section in the admin area.
Our newly created attribute shown in the customer address form.