Magento 2: Show message on every page using message manager

Display the new message and clear the previous messages on every page using Message Manager.

Create the event.xml in your module and add the below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="layout_render_before">
      <observer name="success_message" instance="Vendor\Module\Observer\MessageObserver" shared="false" />
  </event>
</config>

<?xml version="1.0"?>

</event>

</config>

Create the MessageObserver.php file in the Observer directory

<?php
namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer;

class MessageObserver implements ObserverInterface
{
    public function __construct(       
        \Magento\Framework\Message\ManagerInterface $messageManager,
    )
    {    
        $this->messageManager = $messageManager;   
    }
    public function execute(Observer $observer)
    {
        $this->messageManager->getMessages(true); //this will clear your messageManager container
        $this->messageManager->addSuccess(__('Add Custom message here'));
        return $this;
    }
}

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

use Magento\Framework\Event\Observer;

class MessageObserver implements ObserverInterface

{

public function __construct(

\Magento\Framework\Message\ManagerInterface $messageManager,

)

{

$this->messageManager = $messageManager;

}

public function execute(Observer $observer)

{

$this->messageManager->getMessages(true); //this will clear your messageManager container

$this->messageManager->addSuccess(__('Add Custom message here'));

return $this;

}

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