Custom_module data not getting in $fieldset->addType('mycustomfield'). Magento2

Question

Hi I need to get my custom module form data in getElementHtml(). Here is my form code:

$fieldset->addType(
        'mycustomfield',
        'MY\CustomModule\Block\Adminhtml\CustomModule\Renderer\Image'
    );  

    $fieldset->addField(
        'customdiv',
        'mycustomfield',
        [
            'name'  => 'customdiv',
            'label' => __('Custom Div'),
            'title' => __('Custom Div'),

        ]
    );

And below are my Image.php

<?php
namespace MY\CustomModule\Block\Adminhtml\CustomModule\Renderer;

use Magento\Backend\App\Action;

class Image extends \Magento\Framework\Data\Form\Element\AbstractElement
{


public function getElementHtml()
{

    $id = $this->getRequest()->getParam('custommodule_id');
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();

    $model = $objectManager->create('MY\CustomModule\Model\CustomModule');
    $model->load($id);

    return $model;
}
}

Did not get ID here. Even not able to create Objectmanage. If I return just normal string it's only working like.

return 'Test';

It's working but not getting any data. Can anyone see to get custom_module ID.

If I return $id OR $model then I get below error:

Item Information Changes have been made to this section that have not been saved. This tab contains invalid data. Please resolve this before saving. 

Answer 1

$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
$custommodule = $objectManager->get('Magento\Framework\Registry')->registry('custommodule');
$custommodule->getId();

Answer 2

$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); $custommodule = $objectManager->get('Magento\Framework\Registry')->registry('custommodule'); $custommodule->getId();