CODE EXAMPLE FOR JAVASCRIPT

phaser animation show on start

 preload ()
    {
        this.load.atlas('bird', 'assets/animations/bird.png', 'assets/animations/bird.json');
    }

    create ()
    {
        this.add.text(400, 32, 'Click to get the next sprite', { color: '#00ff00' }).setOrigin(0.5, 0);

        var animConfig = {
            key: 'walk',
            frames: this.anims.generateFrameNames('bird', { prefix: 'frame', end: 9 }),
            repeat: -1,
            showOnStart: true
        };

        this.anims.create(animConfig);

        //  Create a bunch of random sprites
        const rect = new Phaser.Geom.Rectangle(64, 64, 672, 472);

        const group = this.add.group();
        group.createMultiple({ key: 'bird', frame: 0, quantity: 64, visible: false, active: false });

        //  Randomly position the sprites within the rectangle
        Phaser.Actions.RandomRectangle(group.getChildren(), rect);

        this.input.on('pointerdown', function () {

            const bird = group.getFirstDead();

            if (bird)
            {
                bird.active = true;
                bird.setDepth(bird.y);

                //  As soon as we play the animation, the Sprite will be made visible
                bird.play('walk');
            }

        });
    }