NativeScript/apps/ui/src/list-view/width-percent-page.ts

import { View } from '@nativescript/core/ui/core/view';
import { ListView } from '@nativescript/core/ui/list-view';
import { EventData } from '@nativescript/core/data/observable';

export function onNavigatingTo(args) {
	const page = args.object;
	page.bindingContext = ['Item 1', 'Item 2', 'Item 3', 'Item 4', 'Item 5', 'Item 6'];
}

let scrollToBottom = true;
export function onScroll(args: EventData) {
	let page = (<View>args.object).page;

	let listView = page.getViewById<ListView>('listView');
	listView.scrollToIndex(scrollToBottom ? listView.items.length - 1 : 0);

	scrollToBottom = !scrollToBottom;
}