I want to add a warning message on the product page but it's not working if full page cache is enabled. I'm using the following event

<event name="controller_action_predispatch_catalog_product_view">
        <observer name="product_view_custom_action" instance="My\Module\Observer\Custom"/>

And in observer execute I have the following

$this->messageManager->addWarningMessage(__('My warning message'));

Is there a method that I could do this to show the warning message every time. Even after the page is cached?

  • We can use Ajax. – Khoa TruongDinh Mar 22 '18 at 16:18
  • Hi @KhoaTruongDinh, could you point me to an example? Thank you. – Magarusu Mar 26 '18 at 12:31
  • @Magarusu Did you able to solve this ? – Vinoth Jun 12 '18 at 7:25
  • @Vinoth Yes, I forgot to update the question. I've added my solution, hope it helps. – Magarusu Jun 13 '18 at 8:27

you can use magento event http_response_send_before.

  • 'http_response_send_before' does not work and I can't seem to find this dispatch in the code. I've tried a plugin on 'Magento\Framework\App\Response\Http::beforeSendResponse' and it does not work either. The code is called every time but only when I hit an uncached page will the message be show. And it's shown for every time it got triggered. Meaning, if I refresh a cached page severl times, when I hit an uncached one it will show my message for each previous hit. – Magarusu Mar 23 '18 at 9:26

I've managed to achieve this using a template defined under: My/Module/view/frontend/layout/catalog_product_view.xml

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    <referenceContainer name="page.messages">
        <block class="My\Module\Block\Messages" name="CUSTOM_ID" as="CUSTOM_ID"
               template="My_Module::messages.phtml" after="messages"/>

And then in your phtml file:

<div role="alert" class="messages">
    <div class="message-warning warning message">
        <div><?php echo $block->escapeHtml(__('My warning message')) ?></div>

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