Phaser API Documentation

Description:

The Tween Active Event.

This event is dispatched by a Tween when it becomes active within the Tween Manager.

An 'active' Tween is one that is now progressing, although it may not yet be updating any target properties, due to settings such as delay. If you need an event for when the Tween starts actually updating its first property, see TWEEN_START.

Listen to it from a Tween instance using Tween.on('active', listener), i.e.:

var tween = this.tweens.create({
    targets: image,
    x: 500,
    ease: 'Power1',
    duration: 3000
});
tween.on('active', listener);
this.tweens.existing(tween);

Note that this event is usually dispatched already by the time you call this.tweens.add(), and is meant for use with tweens.create() and/or tweens.existing().