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How to display field "VAT Number" (required) during registration.

This field is visible when editing the user from the administration panel. Only how to display them during registration?

I found code in:

app/design/frontend/YOUR_PACKAGE/YOUR_THEME/Magento_Customer/templates/form/register.phtml

This file contains fields that are displayed during registration:

 <input type="hidden" name="create_address" value="1" />
 <div class="field company">
 <label for="company" class="label"><span><?php /* @escapeNotVerified */ echo __('Company') ?></span></label>
 <div class="control">
 <input type="text" name="company" id="company" value="<?php echo $block->escapeHtml($block->getFormData()->getCompany()) ?>" title="<?php /* @escapeNotVerified */ echo __('Company') ?>" class="input-text <?php /* @escapeNotVerified */ echo $this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('company') ?>">
 </div>
 </div>
 <div class="field telephone">
 <label for="telephone" class="label"><span><?php /* @escapeNotVerified */ echo __('Phone Number') ?></span></label>
 <div class="control">
 <input type="text" name="telephone" id="telephone" value="<?php echo $block->escapeHtml($block->getFormData()->getTelephone()) ?>" title="<?php /* @escapeNotVerified */ echo __('Phone Number') ?>" class="input-text <?php /* @escapeNotVerified */ echo $this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('telephone') ?>">
 </div>
 </div>

 <?php $_streetValidationClass = $this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('street'); ?>

 <div class="field street required">
 <label for="street_1" class="label"><span><?php /* @escapeNotVerified */ echo __('Street Address') ?></span></label>
 <div class="control">
 <input type="text" name="street[]" value="<?php echo $block->escapeHtml($block->getFormData()->getStreet(0)) ?>" title="<?php /* @escapeNotVerified */ echo __('Street Address') ?>" id="street_1" class="input-text <?php /* @escapeNotVerified */ echo $_streetValidationClass ?>">
 <div class="nested">
 <?php $_streetValidationClass = trim(str_replace('required-entry', '', $_streetValidationClass)); ?>
 <?php for ($_i = 2, $_n = $this->helper('MagentoCustomerHelperAddress')->getStreetLines(); $_i <= $_n; $_i++): ?>
 <div class="field additional">
 <label class="label" for="street_<?php /* @escapeNotVerified */ echo $_i ?>">
 <span><?php /* @escapeNotVerified */ echo __('Address') ?></span>
 </label>
 <div class="control">
 <input type="text" name="street[]" value="<?php echo $block->escapeHtml($block->getFormData()->getStreetLine($_i - 1)) ?>" title="<?php /* @escapeNotVerified */ echo __('Street Address %1', $_i) ?>" id="street_<?php /* @escapeNotVerified */ echo $_i ?>" class="input-text <?php /* @escapeNotVerified */ echo $_streetValidationClass ?>">
 </div>
 </div>
 <?php endfor; ?>
 </div>
 </div>
 </div>

 <div class="field required">
 <label for="city" class="label"><span><?php /* @escapeNotVerified */ echo __('City') ?></span></label>
 <div class="control">
 <input type="text" name="city" value="<?php echo $block->escapeHtml($block->getFormData()->getCity()) ?>" title="<?php /* @escapeNotVerified */ echo __('City') ?>" class="input-text <?php /* @escapeNotVerified */ echo $this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('city') ?>" id="city">
 </div>
 </div>

 <div class="field region required">
 <label for="region_id" class="label"><span><?php /* @escapeNotVerified */ echo __('State/Province') ?></span></label>
 <div class="control">
 <select id="region_id" name="region_id" title="<?php /* @escapeNotVerified */ echo __('State/Province') ?>" class="validate-select" style="display:none;">
 <option value=""><?php /* @escapeNotVerified */ echo __('Please select a region, state or province.') ?></option>
 </select>
 <input type="text" id="region" name="region" value="<?php echo $block->escapeHtml($block->getRegion()) ?>" title="<?php /* @escapeNotVerified */ echo __('State/Province') ?>" class="input-text <?php /* @escapeNotVerified */ echo $this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('region') ?>" style="display:none;">
 </div>
 </div>

 <div class="field zip required">
 <label for="zip" class="label"><span><?php /* @escapeNotVerified */ echo __('Zip/Postal Code') ?></span></label>
 <div class="control">
 <input type="text" name="postcode" value="<?php echo $block->escapeHtml($block->getFormData()->getPostcode()) ?>" title="<?php /* @escapeNotVerified */ echo __('Zip/Postal Code') ?>" id="zip" class="input-text validate-zip-international <?php /* @escapeNotVerified */ echo $this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('postcode') ?>">
 </div>
 </div>

 <div class="field country required">
 <label for="country" class="label"><span><?php /* @escapeNotVerified */ echo __('Country') ?></span></label>
 <div class="control">
 <?php echo $block->getCountryHtmlSelect() ?>
 </div>
 </div>
 <?php $addressAttributes = $block->getChildBlock('customer_form_address_user_attributes');?>
 <?php if ($addressAttributes): ?>
 <?php $addressAttributes->setEntityType('customer_address'); ?>
 <?php $addressAttributes->setFieldIdFormat('address:%1$s')->setFieldNameFormat('address[%1$s]');?>
 <?php $block->restoreSessionData($addressAttributes->getMetadataForm(), 'address');?>
 <?php echo $addressAttributes->setShowContainer(false)->toHtml()?>
 <?php endif;?>
 <input type="hidden" name="default_billing" value="1">
 <input type="hidden" name="default_shipping" value="1">
 </fieldset>

I also found this code in this file:

<?php $_taxvat = $block->getLayout()->createBlock('MagentoCustomerBlockWidgetTaxvat') ?>
 <?php if ($_taxvat->isEnabled()): ?>
 <?php echo $_taxvat->setTaxvat($block->getFormData()->getTaxvat())->toHtml() ?>
 <<?php endif ?>

To use that field at customer registration, you need to enable all the other address fields and then add a addtional field for "vat_id" to /vendor/magento/module-customer/view/frontend/templates/form/register.phtml.

Then you need to add validation if you want the field to be required.

In the phtml file there is <?php if ($block->getShowAddressFields()): ?> change this to <?php if (true): ?> to show the address fields.

Then add a new field:

<div class="field vat_id required">
 <label for="vat_id" class="label"><span><?= $block->escapeHtml(__('VAT Number')) ?></span></label>
 <div class="control">
 <input type="text" name="vat_id" value="<?= $block->escapeHtmlAttr($block->getFormData()->getVatId()) ?>" title="<?= $block->escapeHtmlAttr(__('VAT Number')) ?>" id="vat_id" class="input-text required <?= $block->escapeHtmlAttr($this->helper('MagentoCustomerHelperAddress')->getAttributeValidationClass('vat_id')) ?>">
 </div>
 </div>

Of course you should use an own template file (in your theme or module) for this, instead of the core file.

Another possibility is https://www.geissweb.de/eu-vat-enhanced-for-magento-2.html which has a config option to show the address fields and the VAT number field at customer registration. You can also add validation to the field with the module, its options are:

• Optional


• Optional, but require a valid VAT number when filled


• Require a valid VAT number, validated through the validation service