I am using checkout_cart_product_add_after and checkout_cart_product_update_after events for making customization using observer on front-end this works properly there but in admin side this events are not working.
I guess this events are only for front-end. can any one please tell me how to implement this event observer in admin or any other event which is equivalent to this events.
Best idea to use sales_quote_product_add_after .
$this->_eventManager->dispatch('sales_quote_product_add_after', ['items' => $items]);
This event is fire when an item will added in and when item will be update
For this event, you can current quote items list
using $observer->getItems()
This event is fire both for frontend and backend
Where is your events.xml situated? In etc, etc/frontend or etc/adminhtml? If it's only in etc/frontend you need to move you events.xml to etc, or add an events.xml-file to your etc/adminhtml-folder with a similar event.
Another thing could be that the checkout is indeed something that is frontend-only. If you're using the admin, you're not using a checkout, but you're creating a quote / order. In that case you might want to take a look at Magento\Sales\Controller\Adminhtml\Order\Create\Save(). This is the controller that handles the saving of an order from the admin and might be a good starting point.
If I'm running through the code I finally come to a method called Magento\Sales\Model\AdminOrder\Create::createOrder(). This order dispatches an event called checkout_submit_all_after, but because it's a public method as well you could also use a plugin / interceptor for this, depending on your needs. Make sure to put your di.xml or events.xml in the etc/adminhtml-folder, otherwise they might collide with your previously checkout-related events. It could be even possible that if you hook into this method, the checkout-events can already be obsolete.
I hope this helps you a bit. I haven't tried it out, but I think it should do the trick.
