Value is not save in backend in magento2

Question

I am using Magento 2.1.0, and i created two customer attribute, it succefully created in backend, and i am that in database, customer grid and customer information page.

but when i enter any value in that, it is not save.

<?php

 namespace xxxxxx\CustomerAttr\Setup;

 use Magento\Eav\Setup\EavSetup;
  use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
 use Magento\Eav\Model\Config;



 /**
     * @codeCoverageIgnore
     */
       class InstallData implements InstallDataInterface
         {
/**
 * Customer setup factory
 *
 * @var CustomerSetupFactory
 */
private $eavSetupFactory;

/**
 * Init
 *
 * @param CustomerSetupFactory $customerSetupFactory
 */
           public function __construct(EavSetupFactory $eavSetupFactory, Config $eavConfig)
{
    $this->eavSetupFactory = $eavSetupFactory;
    $this->eavConfig = $eavConfig;
}


public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{
    $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
    $eavSetup->addAttribute(
        \Magento\Customer\Model\Customer::ENTITY,
        'city',
        [
            'type' => 'varchar',
            'label' => 'city',
            'input' => 'text',
            'required' => false,
            'sort_order' => 100,
            'system' => false,
            'position' => 100,
            'is_used_in_grid' => true,
            'is_visible_in_grid' => true,
            'is_filterable_in_grid' => true,
            'is_searchable_in_grid' => true,
        ]
    );
    $eavSetup->addAttribute(
        \Magento\Customer\Model\Customer::ENTITY,
        'area',
        [
            'type' => 'varchar',
            'label' => 'area',
            'input' => 'text',
            'required' => false,
            'sort_order' => 100,
            'system' => false,
            'position' => 100,
            'is_used_in_grid' => true,
            'is_visible_in_grid' => true,
            'is_filterable_in_grid' => true,
            'is_searchable_in_grid' => true,
        ]
    );
    $sampleAttribute = $this->eavConfig->getAttribute(\Magento\Customer\Model\Customer::ENTITY, 'city');
    $sampleAttribute->setData(
        'used_in_forms',
        ['adminhtml_customer_address', 'customer_address_edit', 'customer_register_address' ,'customer_account_create']
    );
    $sampleAttribute->save();
    $sampleAttribute = $this->eavConfig->getAttribute(\Magento\Customer\Model\Customer::ENTITY, 'area');
    $sampleAttribute->setData(
        'used_in_forms',
        ['adminhtml_customer_address', 'customer_address_edit', 'customer_register_address', 'customer_account_create']
    );
    $sampleAttribute->save();

}
}

even, i have two field on registration page, and i want this attribute take data from field, how to make relation between this???

Answer 1

To Save your attribute value in backend , You also need to pass Parameter backend with its value and also there are few modifications needed in your parameters Which i have done below .

So try below code :

 $eavSetup->addAttribute(
        \Magento\Customer\Model\Customer::ENTITY,
        'area',
        [
            'type' => 'varchar',
            'label' => 'area',
            'input' => 'text',
            'class' => '',
            'source' => '',
            'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
            'global' => \Magento\Catalog\Model\ResourceModel\Eav\Attribute::SCOPE_GLOBAL,
            'required' => false,
            'sort_order' => 100,
            'system' => false,
            'visible' => true,
            'required' => false,
            'user_defined' => false,
            'default' => 0,
            'searchable' => true,
            'filterable' => true,
            'comparable' => true,
            'visible_on_front' => true,
            'used_in_product_listing' => true,
            'unique' => false,
            'apply_to' => ''
        ]
    );