Magento version: 2.0


<event name="prepare_catalog_product_index_select">
        <observer name="list_product_observer" instance="Demo\Product\Observer\ListProductObserver" />


class ListProductObserver implements ObserverInterface
    public function execute(Observer $observer)
        $data = array(
            'product' => $productId,
            'user'  => $userId,
            'value' => 333
        $myfile = fopen("/file_path/ListProductObserver.txt", "w");
        fwrite($myfile, print_r($data, true));

I create a function to do some when admin user enter the catalog list page. But it doesn't work for me.

  • I'd check next cases: 1. Be sure that event "prepare_catalog_product_index_select" is dispatched. 2. Verify that your observer is in list of the event observers. Need to debug code in \Magento\Framework\Event\Manager::dispatch 3. Verify that your observer is invoked. – Arkadii Chyzhov Mar 14 '16 at 12:04
  • @ArkadiiChyzhov do you have the full list of events? do you tell me where i can find them? – Mike Zhang Mar 14 '16 at 12:12
  • @ArkadiiChyzhov 1, this event is in the list of url you recommend below. 2, I tried to check whether it is in the event list, but i can get the error or correct message on \Magento\Framework\Event\Manager::dispatch. do you have another suggestion? – Mike Zhang Mar 14 '16 at 15:19

You defined the instance of "ListProductObserver" in events.xml, but you named the class as "ListOwnerProductObserver"

  • thanks for your reply. i made a typo and correct it just now. but it doesn't work for me. I guess the event name is wrong. i don't know which name is correct. – Mike Zhang Mar 14 '16 at 11:48

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