typescript - How to add class on scroll in ionic2 -

i want add animation in ionic2 app on scrolling, can't add classes on scroll animation didn't happen on scrolling, animations fired @ 1 time. please me solve problem.

basically there ionscroll event emitter available on ion-content can subscribe , whatever need. can find more in docs.

here example:

template.html

<ion-content #content></ion-content> 

component.js

import { component, viewchild } '@angular/core'  @component({...}) export class component {   @viewchild('content') content = null    ngafterviewinit() {     this.content.ionscroll.subscribe(event => {       // need here       console.log(event)     })   } }