Events

Star Ratings events follow the same pattern as standard Craft events.

use doublesecretagency\starratings\StarRatings;
use doublesecretagency\starratings\events\RateEvent;
use yii\base\Event;

// Do something BEFORE the rating is cast...
Event::on(
    StarRatings::class,
    StarRatings::EVENT_BEFORE_RATE, 
    function (RateEvent $event) {
        // See the complete list of parameters below
        $elementId = $event->id;
    }
);

use doublesecretagency\starratings\StarRatings;
use doublesecretagency\starratings\events\RateEvent;
use yii\base\Event;

// Do something AFTER the rating is cast...
Event::on(
    StarRatings::class,
    StarRatings::EVENT_AFTER_RATE,
    function (RateEvent $event) {
        // See the complete list of parameters below
        $elementId = $event->id;
    }
);

Both events give you access to the RateEvent model in the $event variable. The contents of that variable will look like this...

Parameter	Type	Description
id	int	Element ID of the element being rated.
key	string or null	Optional key for allowing multiple rating types.
rating	int	The value of the rating.
changedFrom	int	The previous rating value (if it exists).
userId	int	ID of the user casting a rating (if login is required to rate).