Magento 2 . Add custom success message on successful checkout

Question

I am working on Magento version 2.1.10 and created an observer for event "sales_order_place_after", I need to show custom success message after successful checkout on checkout success page.

following is my current code:

namespace Vendor\Module\Observer;
use Magento\Framework\Event\ObserverInterface;

class Customsuccess implements \Magento\Framework\Event\ObserverInterface
{
    protected $_messageManager;

    public function __construct(\Magento\Framework\Message\ManagerInterface $messageManager )
    {
        $this->_messageManager = $messageManager;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    { 
        $this->_messageManager->addSuccessMessage(__('This is a success message'));
    }
}

But I am getting the error on checkout.

Answer 1

I think you can override the success page and write your own success messages. Why you creating event.

Go to your current theme

app\design\frontend\Renegade\default\Magento_Checkout\templates\success.phtml

You can changed success message that you want