Magento 2 – How to Create Custom Event and Observer

customevent-observermagento2

I know about how to use Magento 2 core events. But I want to know how to create custom events and how to override the controller.

advance thanks

Best Answer

Steps for Create custom Event Overserver

Define ur event name in events.xml and Create a class file for same as per below coding.

Vendor/Module/Observer/CustomObserverMethod.php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

class CustomObserverMethod implements ObserverInterface
{
    /**
     * custom event handler
     *
     * @param \Magento\Framework\Event\Observer $observer
     * @return void
     */
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
      //logic herer
    }
}

Vendor/Module/etc/events.xml

<?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="custom_observer_name">
        <observer name="custom_observer_method" instance="Vendor\Module\Observer\CustomObserverMethod"/>
    </event>
</config>

Ref Link: https://webkul.com/blog/how-to-create-custom-observers-in-magento2/

Related Solutions

Magento – Observer (event hook) for media or images

Try the event catalog_product_gallery_upload_image_after this should be fired on the upload action of the controller Mage_Adminhtml_Catalog_Product_GalleryController from your question I think this is the right event for you.

Magento 1.9 Module Layout – Add Block Dynamically in Event Observer

The event checkout_onepage_controller_success_action is triggered right before the layout is rendered, so you can still manipulate it.

The observer only receives the order id as a parameter, so you have to get the layout via app model:

$layout = Mage::app()->getLayout();

Now you can do your changes programmatically, like this:

$messageBlock = $layout->createBlock('core/template', 'payment_message_block');
$messageBlock->setTemplate('payment_message.phtml');
$layout->getBlock('footer')->append($messageBlock);

If you use the controller_action_layout_load_before event, you can also load a custom layout handle like this, if on the success page:

if ($observer->getAction()->getFullActionName() === 'checkout_onepage_success') {
    $layout = $observer->getLayout();
    $layout->getUpdate()->addHandle('custom_layout_handle');
}

which you can define in XML:

<layout>
  <custom_layout_handle>
     <reference name="footer">
       <block type="core/template" name="payment_message_block" template="payment_message.phtml" />
     </reference>
  </custom_layout_handle>
</layout>

Update: The footer block is cached, so we have to make sure that a different version is fetched from the cache if the message is present. For example:

$footer = $layout->getBlock('footer');
$footer->setCacheKey(sha1($footer->getCacheKey() . '-payment-message');

how to pass genrated data to phtml file? which i am showing

Reference your block by name and use setData(). For example:

$block = $layout->getBlock('payment_message_block')->setData('messsage', 'Hello');

And in the template:

echo $this->getData('message');

Best Answer

Related Solutions

Magento – Observer (event hook) for media or images

Magento 1.9 Module Layout – Add Block Dynamically in Event Observer

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