How do I use event observer in Magento 2?

How do I use event observer in Magento 2?

Magento 2 Create Events – Observer in Magento 2

1. Step 1: Dispatch event.
2. Step 2: Create a event file: events.xml.
3. Step 3: Create Observer class.
4. Step 4: Flush cache and check the result.

How do you call observer in Magento 2?

To create an observer in Magento 2, you must place your class file under the ModuleRoot/Observer directory. The observer class file should use Magento\Framework\Event\Observer and Magento\Framework\Event\ObserverInterface class and define the executive function.

What are Magento 2 events?

Events. Events are triggered by Magento 2 modules when an action has occurred or has to occur. Magento has many native events and also allows you to call your own event. Use the dispatch method of the \Magento\Framework\Event\ Manager class to call an event.

What is difference between observer and Plugin in Magento 2?

observers are slower than plugins because Magento creates at least 3 objects upon the trigger event; observers offer less flexibility when you need to introduce platform-wide features; event observers have critical limitations since they MUST NOT change the objects that they influence.

What is the use of block in Magento 2?

Blocks are a foundational building unit for layouts in Magento. They are the link between a PHP block class (which contains logic) and a template (which renders content).

How are events and observers implemented in Magento 2?

The events and observers implementation in Magento 2 is based on the publish-subscribe pattern. Using events and observers, you can run your custom code in response to a specific Magento event or even a custom event. Events are dispatched by modules when certain actions are triggered.

Where to find events.xml file in Magento?

With this events.xml file, Magento will execute class Mageplaza\\HelloWorld\\Observer\\ChangeDisplayText whenever the dispatch method of this event was called on frontend area. Please note that, we place events.xml in the frontend area, so if you dispatch that event in the admin area (like admin controller), it will not run.

How is an event dispatched in Magento framework?

When an event is dispatched, it can pass data to any observers configured to watch that event. Events can be dispatched using the Magento\\Framework\\Event\\ManagerInterface class.

Can you have two observers with the same name?

Observer names must be unique per event definition. This means that you cannot have two observers with the same name in the same event definition. In the example, both observers have the name myObserverName. This is acceptable because each of those observers belong to different event definitions.