How to show a menu on customers account conditionally?

Question

I have created a custom menu on customer account. I want to show the menu only when a specific customer attribute value is set. I am not able to find out whether there is any way to show the menu conditionally in Magento2?

To show the custom menu, I am using this in view/layout/frontend/customer_account.xml

<referenceBlock name="customer_account_navigation">
    <block class="Magento\Framework\View\Element\Html\Link\Current" name="customer-account-customfield-index-link">
        <arguments>
            <argument name="path" xsi:type="string">mymodule/customfields</argument>
            <argument name="label" xsi:type="string" translate="true">Identity Proof</argument>
        </arguments>
    </block>
</referenceBlock>

Answer 1

First You need create block extents class Magento\Framework\View\Element\Html\Link\Current

After that use use it in to your template view/layout/frontend/customer_account.xml like this

<referenceBlock name="customer_account_navigation">
    <block class="Namespace\Module\Block\View\Element\Html\Link\Current" name="customer-account-customfield-index-link">
        <arguments>
            <argument name="path" xsi:type="string">mymodule/customfields</argument>
            <argument name="label" xsi:type="string" translate="true">Identity Proof</argument>
        </arguments>
    </block>
</referenceBlock>

Then overwrite function toHtml() like this

public function toHtml(){
      if($this->_customerSession->getCustomer()->getYourAttribute()){
           return parent::toHtml();
      }
      return '';
}

Which full block code

namespace Namespace\Module\Block\View\Element\Html\Link;

use Magento\Customer\Model\Session as CustomerSession;

class Current extends \Magento\Framework\View\Element\Html\Link\Current{

    protected $_customerSession;
    /**
     * Constructor
     *
     * @param \Magento\Framework\View\Element\Template\Context $context
     * @param \Magento\Framework\App\DefaultPathInterface $defaultPath
     * @param array $data
     */
    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\App\DefaultPathInterface $defaultPath,
        CustomerSession $CustomerSession,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_defaultPath = $defaultPath;
        $this->_customerSession = $CustomerSession;
    }


    public function toHtml(){
          if($this->_customerSession->getCustomer()->getYourAttribute()){
               return parent::toHtml();
          }
          return '';
    }  
}