Listen to Game Object Custom Events

let info;
let timer;
let alive = 0;

class Example extends Phaser.Scene
{
    constructor ()
    {
        super();
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.image('bg', 'assets/skies/sky4.png');
        this.load.image('crate', 'assets/sprites/crate.png');
    }

    create ()
    {
        //  How many crates can you click on in 10 seconds?
        this.add.image(400, 300, 'bg');

        //  Create a bunch of images
        for (var i = 0; i < 64; i++)
        {
            var x = Phaser.Math.Between(0, 800);
            var y = Phaser.Math.Between(0, 600);

            var box = this.add.image(x, y, 'crate');

            //  Make them all input enabled
            box.setInteractive();

            //  The images will dispatch a 'clicked' event when they are clicked on
            box.on('clicked', this.clickHandler, this);

            alive++;
        }

        //  If a Game Object is clicked on, this event is fired.
        //  We can use it to emit the 'clicked' event on the game object itself.
        this.input.on('gameobjectup', function (pointer, gameObject)
        {
            gameObject.emit('clicked', gameObject);
        }, this);

        //  Display the game stats
        info = this.add.text(10, 10, '', { font: '48px Arial', fill: '#000000' });

        timer = this.time.addEvent({ delay: 10000, callback: this.gameOver, callbackScope: this });
    }

    update ()
    {
        info.setText('Alive: ' + alive + '\nTime: ' + Math.floor(10000 - timer.getElapsed()));
    }

    clickHandler (box)
    {
        alive--;

        box.off('clicked', this.clickHandler);
        box.input.enabled = false;
        box.setVisible(false);
    }

    gameOver ()
    {
        this.input.off('gameobjectup');
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    parent: 'game-container',
    width: 800,
    height: 600,
    scene: Example
};

const game = new Phaser.Game(config);