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

import { EventData } from "tns-core-modules/data/observable";
import { Frame } from "tns-core-modules/ui/frame/frame";
import { Page } from "tns-core-modules/ui/page";
import {
  TabStripItemEventData, SelectedIndexChangedEventData, BottomNavigation, TabStrip,
} from "tns-core-modules/ui/bottom-navigation";

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

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

export function goToThird(args: EventData) {
  console.log("---> goToThird");
  const page = <Page>(<any>args.object).page;
  const bottomNav = <BottomNavigation>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 onItemTap(args: TabStripItemEventData) {
  console.log("---> onItemTap", args.eventName);
  console.log("---> onItemTap", args.index);
  console.log("---> onItemTap", args.object);

  const tabStrip = <TabStrip>args.object;
  const page = <Page>tabStrip.page;
  const frame = <Frame>page.getViewById("frame");
  const bottomNav = <BottomNavigation>page.getViewById("bottomNav");

  console.log("---> onItemTap selectedIndex", bottomNav.selectedIndex);
  if (bottomNav.selectedIndex === args.index && frame.canGoBack()) {
    frame.goBack();
  }
}

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);
}