NativeScript/e2e/ui-tests-app/app/bottom-navigation/events-page.ts

import { EventData } from "tns-core-modules/data/observable";
import { Page } from "tns-core-modules/ui/page";
import { Tabs, SelectedIndexChangedEventData } from "tns-core-modules/ui/tabs";

export function goToFirst(args: EventData) {
  console.log("---> goToFirst");
  const page = <Page>(<any>args.object).page;
  const bottomNav = <Tabs>page.getViewById("bottomNav");
  bottomNav.selectedIndex = 0;
}

export function goToSecond(args: EventData) {
  console.log("---> goToSecond");
  const page = <Page>(<any>args.object).page;
  const bottomNav = <Tabs>page.getViewById("bottomNav");
  bottomNav.selectedIndex = 1;
}

export function goToThird(args: EventData) {
  console.log("---> goToThird");
  const page = <Page>(<any>args.object).page;
  const bottomNav = <Tabs>page.getViewById("bottomNav");
  bottomNav.selectedIndex = 2;
}

export function onSelectedIndexChanged(args: SelectedIndexChangedEventData) {
  console.log("---> onSelectedIndexChanged", args.eventName);
  console.log("---> oldIndex", args.oldIndex);
  console.log("---> newIndex", args.newIndex);
}

export function onFirstTabStripItemTap(args: EventData) {
  console.log("---> onFirstTabStripItemTap", args.eventName);
}

export function onSecondTabStripItemTap(args: EventData) {
  console.log("---> onSecondTabStripItemTap", args.eventName);
}

export function onThirdTabStripItemTap(args: EventData) {
  console.log("---> onThirdTabStripItemTap", args.eventName);
}