How to add a custom drop-down to the checkout page,and save its value on an order placement?

I have added the drop-down custom field on checkout page with custom values. It’s working fine for checkout page but once place order not save attribute values in the database.any idea how to save it?

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InstallSchema.php

$connection->addColumn(
                $installer->getTable('quote_address'),
                'mob_type',
                [
                    'type' => \Magento\Framework\DB\Ddl\Table ::TYPE_TEXT,
                    'nullable' => true,
                    'default' => NULL,
                    'length' => 255,
                    'comment' => 'Mob Type'
                ]
            );
        $connection->addColumn(
                $installer->getTable('sales_order_address'),
                'mob_type',
                [
                    'type' => \Magento\Framework\DB\Ddl\Table ::TYPE_TEXT,
                    'nullable' => true,
                    'default' => NULL,
                    'length' => 255,
                    'comment' => 'Mob Type'
                ]
            );
        $installer->endSetup();

Plugin

use Magento\Checkout\Block\Checkout\LayoutProcessor;

class MobPlugin
{
    public function afterProcess(LayoutProcessor $subject, $jsLayout) {
        $customAttributeCode = 'mob_type';
        $customField = [
            'component' => 'Magento_Ui/js/form/element/select',
            'config' => [
                'customScope' => 'shippingAddress.custom_attributes',
                'template' => 'ui/form/field',
                'elementTmpl' => 'ui/form/element/select',
                'id' => 'drop-down',
            ],
            'dataScope' => 'shippingAddress.custom_attributes.mob_type',
            'label' => 'Mob Type',
            'provider' => 'checkoutProvider',
            'visible' => true,
            'validation' => ['required-entry' => true],
            'sortOrder' => 150,
            'id' => 'drop-down',
            'options' => [
                [
                    'value' => 'local',
                    'label' => 'Local',
                ],
                [
                    'value' => 'vip',
                    'label' => 'VIP',
                ]
            ]
        ];

        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']['shippingAddress']['children']['shipping-address-fieldset']['children'][$customAttributeCode] = $customField;

        return $jsLayout;
    }
}

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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="Magento\Checkout\Model\ShippingInformationManagement">
        <plugin name="save_custom_field" type="Namespace\CustomModule\Plugin\Checkout\SaveAddressInformation" />
    </type>

</config>

SaveAddressInformation.php

class SaveAddressInformation
{
    protected $quoteRepository;
    public function __construct(
        \Magento\Quote\Model\QuoteRepository $quoteRepository
    ) {
        $this->quoteRepository = $quoteRepository;
    }
    /**
     * @param \Magento\Checkout\Model\ShippingInformationManagement $subject
     * @param $cartId
     * @param \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation
     */
    public function beforeSaveAddressInformation(
        \Magento\Checkout\Model\ShippingInformationManagement $subject,
        $cartId,
        \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation
    ) {
        $extensionAttributes = $addressInformation->getExtensionAttributes();
        $customField = $extensionAttributes->getMobType();
        $quote = $this->quoteRepository->getActive($cartId);
        $quote->setMobType($customField);
        //$quote->save();

    }
}


reference link - https://www.edmondscommerce.co.uk/handbook/Platforms/Magento-2/Custom-Shipping-Address-Field/
I want to display custom attribute in order view page and email template also.anyone have an idea what’s wrong with the code.Thanks in advance

Plugin code save quote_address table in values but fields do not display on order shipping address backend and frontend in order.

$shippingAddress = $addressInformation->getShippingAddress();
        $shippingAddressExtensionAttributes = $shippingAddress->getExtensionAttributes();
        if ($shippingAddressExtensionAttributes) {
            $customField = $shippingAddressExtensionAttributes->getMobType();
            $shippingAddress->setMobType($customField);
        }

Hi,

Did you ever figure this out? I am trying to do something very similar.

Thanks!

How can I get data from database to display in dropdown?? Please help me

Hi,

What data are you looking for? What dropdown?

Stan