The current way to do it is like this:
HTML:
<ion-content id="my-content">
JS:
// Need to wait until the component has been initialized
ngAfterViewInit() {
// Here 'my-content' is the ID of my ion-content
this.content = this.app.getComponent('my-content');
this.content.addScrollEventListener(this.onPageScroll);
}
onPageScroll() {
console.log('They see me scrolling...');
}
Where did you see an on-scroll attribute?