Magento2: Block not created from controller

Question

How to create block from controller by ajax method?

 $result = $this->resultJsonFactory->create();
 $resultPage = $this->_resultPageFactory->create();
 $block = $resultPage->getLayout()
 ->createBlock('Module\Ajaxcart\Block\BuildProductInfo')
 ->setTemplate('Module_Ajaxcart::buildproductinfo.phtml')
 ->toHtml();

Showing Cache Exception Error

• Amit Bera: Please share your full code of execute() function

Answer 1

Try This :-

protected $resultPageFactory;
public function __construct(
 Magento\Framework\View\Result\PageFactory $resultPageFactory
){
 $this->resultPageFactory = $resultPageFactory;
} 
public function execute() 
{
 $layout = $this->resultPageFactory->create();
 $block = $layout->getLayout()
 ->createBlock('Module\Ajaxcart\Block\BuildProductInfo')
 ->setTemplate('Module_Ajaxcart::buildproductinfo.phtml')
 ->toHtml();
}

• Masud Shaikh: We need to clean the cache?
• Ronak Rathod: you need to setup:upgrade also
• Dominic Pixie: You can also define cache behavior in controller devdocs.magento.com/guides/v2.3/extension-dev-guide/cache/…
• Masud Shaikh: Ok, I will check and update you soon.
• Ronak Rathod: ok nop happy coding

Answer 2

You don't send a response from your ajax controller.

result factory type should be json

$resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);

Code Sample:

<?php
namespace Magento\Contact\Controller\Index;
use Magento\Framework\Controller\ResultFactory;
class AjaxCall extends \Magento\Framework\App\Action\Action
{
 public function __construct(
 \Magento\Framework\App\Action\Context $context
 ) {
 parent::__construct($context);
 }
 public function execute() {
 $this->_view->loadLayout();
 $layout = $this->_view->getLayout();
 $customBlock = $layout->createBlock(
 \Magento\Contact\Block\ContactForm::class,
 'ajax.contact-us',
 ['data' => ['id' => 'test']]
 )->setTemplate('Magento_Contact::form.phtml');
 $resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);
 return $resultJson->setData(
 [
 'html' => $customBlock->toHtml(),
 'message' => __('my message')
 ]
 );
 }
}

• Masud Shaikh: Source class "\Module\Ajaxcart\Controller\Cart\Result" for "Module\Ajaxcart\Controller\Cart\ResultFactory" generation does not exist.
• Amit Bera: Please share your code and some issue at depency injection
• Masud Shaikh: Can you share chat box
• Amit Bera: Post your full code controller at chat room chat.stackexchange.com/rooms/94208/…