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Home PHP Framework YII How to bind events in yii2.0

How to bind events in yii2.0

Feb 17, 2020 pm 02:20 PM
yii event

How to bind events in yii2.0

In yii2, event binding is operated through the on method of yii\base\Component. When we define the event, we need to bind a callback function to it.

Look at the example, first write a controller, use on to bind the event, and then use triggle in the method to call 

namespace backend\controllers;

use yii\web\Controller;

class EventController extends Controller
{
   const TEST_EVENT = 'event';

    public function init()
    {
        parent::init();
        $this->on(self::TEST_EVENT,function(){echo '這個一個事件測試。。。';});
    }


    public function actionIndex()
    {
        $this->trigger(self::TEST_EVENT);
    }
}

to access the index method and get the result of the event. When entering the controller, a time is bound to 'event'. The first parameter of on represents the event name (must be a constant), and the second parameter is the callback function of this event.

(Recommended tutorial: yii framework)

can also be written in the following way: 

namespace backend\controllers;

use yii\web\Controller;

class EventController extends Controller
{
   const TEST_EVENT = 'event';

    public function init()
    {
        parent::init();
        $this->on(self::TEST_EVENT,[$this,'onTest']);
    }


    public function onTest()
    {
        echo '這個一個事件測試。。。';
    }

    public function actionIndex()
    {
        $this->trigger(self::TEST_EVENT);
    }
}

$this represents this object, 'onTest' Refers to the method of execution. After the event is bound, it is useless if it is not called. At this time, the triggle method in the yii\base\Component class is used to call it.

Extended application of events (parameter passing method)

First define a controller and define and call it. If you want to pass in different parameters, you must The yii\base\Event class is used 

class EventController extends Controller
{
    const TEST_USER = 'email'; //發(fā)送郵件
    public function init()
    {
        parent::init();
        $msg = new Msg();
        $this->on(self::TEST_USER,[$msg,'Ontest'],'參數Test');  
    }
    public function actionTest()
    {
        $msgEvent = new MsgEvent();
        $msgEvent->dateTime = 'Test時間';
        $msgEvent->author = 'Test作者';
        $msgEvent->content = 'Test內容';
        $this->trigger(self::TEST_USER,$msgEvent);
    }
}
class MsgEvent extends Event
{
    public $dateTime;   // 時間
    public $author;     // 作者
    public $content;    // 內容

}

msg contains the calling method

class Msg extends ActiveRecord
{
    public function onTest($event) //$event是yii\base\Event的對象
    {
        print_r($event->author);//輸出'Test作者'
        print_r($event->dateTime);//輸出'Test時間'
        print_r($event->content);//輸出'Test內容'
        print_r($event->data);//輸出'參數Test'

    }
}

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