Yii2 Event Listener

Simple event listeners registration component and base abstract classes to implement Linstener or Observer.

Installation

The preferred way to install this extension is through composer.

Either run

composer require --prefer-dist justcoded/yii2-event-listener "*"

or add

"justcoded/yii2-event-listener": "*"

to the require section of your composer.json.

Component Setup

To use the Event Listener Component, you need to configure the components array in your application configuration:

'components' => [
    'listener' => [
        'class'     => \justcoded\yii2\eventlistener\components\EventListener::class,
        'listeners' => [
        	...
        ],
        'observers' => [
        	...
        ],
    ],
],

and add component name to bootstrap array

    'bootstrap'  => ['log', 'listener'],

Usage

Listeners

Listener is a single action, which can be performed on some event. To register a listener you need to create a simple class:

<?php
namespace app\listeners;

use justcoded\yii2\eventlistener\listeners\Listener;
use yii\base\Event;

/**
 * Class SendUserGreeting
 */
class SendUserGreeting extends Listener
{
	/**
	 * Handle action on event trigger.
	 *
	 * @param Event $event
	 *
	 * @return void
	 */
	public function handle(Event $event)
	{
		/* @var \app\models\User $sender */
		$sender = $event->sender;
		
		// TODO: write your code here, for example, send user greeting email after it was registered or created.
	}
}

After that you need to register it within a component inside 'listeners' config array:

'components' => [
    'listener' => [
        'class'     => \justcoded\yii2\eventlistener\components\EventListener::class,
        'listeners' => [
        	\app\models\User::class => [
				\app\models\User::EVENT_AFTER_INSERT => \app\listeners\SendUserGreeting::class,
			],
        ],
    ],
],

Observers

Observer is a class, which can subscribe to several events of the same model. To create an Observer you need to extend it from a basic Observer class and create events() method and methods to handle these events.

Example:

<?php
namespace app\observers;

use app\controllers\SiteController;
use justcoded\yii2\eventlistener\observers\Observer;
use yii\base\Event;

/**
 * Class UserObserver
 */
class SiteControllerObserver extends Observer
{
	public function events()
	{
		return [
			SiteController::EVENT_BEFORE_ACTION => 'before',
			SiteController::EVENT_AFTER_ACTION => 'after',
		];
	}

	/**
	 * Handle before action event
	 *
	 * @param Event $event
	 *
	 * @return void
	 */
	public function before(Event $event)
	{
		/* @var SiteController $sender */
		$sender = $event->sender;
		
		// TODO: write your code here.
	}

	/**
	 * Handle after action event
	 *
	 * @param Event $event
	 *
	 * @return void
	 */
	public function after(Event $event)
	{
		/* @var SiteController $sender */
		$sender = $event->sender;
		
		// TODO: write your code here.
	}	
}

After that you need to register it within a component inside 'observers' config array:

'components' => [
    'listener' => [
        'class'     => \justcoded\yii2\eventlistener\components\EventListener::class,
        'observers' => [
        	app\controllers\SiteController::class => \app\observers\SiteControllerObserver::class,
        	app\models\User::class => \app\observers\UserObserver::class,
        ],
    ],
],

ActiveRevordObserver

Package also contains a specific class called ActiveRecordObserver. This class already declared all ActiveRecord events an methods to process them:

• inserting()
• inserted()
• updating()
• updated()
• deleting()
• deleted()
• validating()
• validated()
• refreshed()
• initialized()

Example:

<?php
namespace app\observers;

use justcoded\yii2\eventlistener\observers\ActiveRecordObserver;
use yii\db\AfterSaveEvent;

/**
 * Class UserObserver
 */
class UserObserver extends ActiveRecordObserver
{
	/**
	 * Handle AFTER_UPDATE ActiveRecord event.
	 *
	 * @param AfterSaveEvent $event
	 *
	 * @return void
	 */
	public function updated(AfterSaveEvent $event)
	{
		/* @var \app\models\User $sender */
		$sender = $event->sender;
		
		// TODO: write your code here.
	}
}