category-page.ts

import { EventData } from "tns-core-modules/data/observable";
const ObservableArray = require("tns-core-modules/data/observable-array").ObservableArray;
import { Button } from "tns-core-modules/ui/button";
import { Page } from "tns-core-modules/ui/page";

export function navigateToItem(args: EventData) {
    const button: Button = <Button>args.object;
    const page: Page = button.page;
    page.frame.navigate("item-page");
}
const titlesArray = new ObservableArray([
    { title: "The Da Vinci Code" },
    { title: "Harry Potter and the Chamber of Secrets" },
    { title: "The Alchemist" },
    { title: "The Godfather" },
    { title: "Goodnight Moon" },
    { title: "The Hobbit" }
]);