Hello,

I have created a custom attribute for customer in Magento 2 site.

The HTML template of the field is this:

<input type="text"
name="<?= $block->escapeHtmlAttr($block->getFieldName('custom')) ?>"
id="custom"
value="<?= $block->escapeHtmlAttr($block->getObject()->getCustom()) ?>"
title="<?= $block->escapeHtmlAttr($block->getAttributeData()->getFrontendLabel('custom')) ?>"
class="input-text"
data-validate="{required:true, 'validateData':true}">

Look at all `$block` calls. None of them works.

`$block->getFieldName('custom')` returns an empty string

`$block->getObject()->getCustom()` throws an exception because `getObject` is null

`$block->getAttributeData()->getFrontendLabel('custom')` throws an exception because `$block->getAttributeData()` is null.

How can I keep the value the user has entered in the custom field when page is reloaded?

The field value is something that should be retrieved dynamically, because if there is an error in the registration form, and the page is reloaded, all fields should be repopulated. This works for all standard fields but not for the custom ones.

This is how I an creating the attribute:

public function addCustomAttribute()
    {
        $eavSetup = $this->eavSetupFactory->create();


        $eavSetup->addAttribute(
            \Magento\Customer\Model\Customer::ENTITY,
            'custom',
            [
                'type' => 'varchar',
                'label' => 'My label',
                'input' => 'text',
                'required' => 1,
                'visible' => 1,
                'user_defined' => 1,
                'sort_order' => 1,
                'position' => 1,
                'system' => 0,
                'is_used_in_grid' => true,
                'is_visible_in_grid' => true,
                'is_filterable_in_grid' => true,
                'is_searchable_in_grid' => true,
            ]
        );

        $attributeSetId = $eavSetup->getDefaultAttributeSetId(Customer::ENTITY);
        $attributeGroupId = $eavSetup->getDefaultAttributeGroupId(Customer::ENTITY);

        $attribute = $this->eavConfig->getAttribute(Customer::ENTITY, 'custom');
        $attribute->setData('attribute_set_id', $attributeSetId);
        $attribute->setData('attribute_group_id', $attributeGroupId);

        $attribute->setData('used_in_forms', [
            'adminhtml_checkout',
            'adminhtml_customer',
            'customer_account_create',
            'customer_account_edit',
            'checkout_index_index'
        ]);

        $this->attributeResource->save($attribute);
    }

Any help, please?