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Home > Web Development > Web Programming > TypeScript Blueprints
TypeScript Blueprints
TypeScript Blueprints

TypeScript Blueprints: Practical Projects to Put TypeScript into Practice

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TypeScript Blueprints

Chapter 2. A Weather Forecast Widget with Angular 2

In this chapter, we'll create a simple application that shows us the weather forecast. The framework we use, Angular 2, is a new framework written by Google in TypeScript. The application will show the weather of the current day and the next. In the following screenshot, you can see the result. We will explore some key concepts of Angular, such as data binding and directives.

A Weather Forecast Widget with Angular 2

We will build the application in the following steps:

  • Using modules
  • Setting up the project
  • Creating the first component
  • Adding conditions to the template
  • Showing a forecast
  • Creating the forecast components
  • The main component

Using modules

We will use modules in all applications in this book. Modules (also called external modules and ES2015 modules) are a concept of separating code in multiple files. Every file is a module. Within these modules, you can use variables, functions, and classes (members) exported by other modules and you can make some members visible for other modules. To use other modules, you must import them, and to make members visible, you need to export them. The following example will show some basic usage:

// x.ts 
import { one, add, Lorem } from './y'; 
console.log(add(one, 2)); 
 
var lorem = new Lorem(); 
console.log(lorem.name); 
 
// y.ts 
export var one = 1; 
export function add(a: number, b: number) { 
  return a + b; 
} 
export class Lorem { 
  name = "ipsum"; 
}

You can export declarations by prefixing them with the export keyword or by prefixing them with export default. A default export should be imported differently though we will not use such an export as...

Setting up the project

We will quickly set up the project before we can start writing. We will use npm to manage our dependencies and gulp to build our project. These tools are built on NodeJS, so it should be installed from nodejs.org.

First of all, we must create a new directory in which we will place all files. We must create a package.json file used by npm:

{ 
  "name": "weather-widget", 
  "version": "1.0.0", 
  "private": true, 
  "description": "" 
}

The package.json file contains information about the project, such as the name, version, and a description. These fields are used by npm when you publish a project on the registry on NPM, which contains a lot of open source projects. We will not publish it there. We set the private field to true, so we cannot accidentally publish it.

Directory structure

We will separate the TypeScript sources from the other files. The TypeScript files will be added in the lib directory...

Creating the first component

Angular is based on components. Components are built with other components and normal HTML tags. Our application will have three components: the forecast page, the about page, and the whole widget. The widget itself, which is referenced in the HTML page, will use the other two widgets.

The widget will show the About page in the third tab, as you can see in the following screenshot:

Creating the first component

The forecast component is shown in the first tab of the following screenshot. We will create the forecast and the widget later in this chapter.

Creating the first component

The template

A component is a class decorated with some metadata. Decorators are functions that can modify a class or decorate it with some metadata. A simple component that does not have any interaction will look like this:

import { Component } from "angular2/core"; 
 
@Component({ 
  selector: "about-page", 
template: ` 
    <h2>About</h2> 
    This widget shows the weather forecast of Utrecht. 
    The next...

Adding conditions to the template

The event handler in the previous section sets the property collapsed to false but that does not modify the template. In normal code, we would have written if (this.collapsed) { ... }. In templates, we cannot use that, but we can use ngIf.

Directives

A directive is an extension to normal HTML tags and attributes. It can define custom behavior. A custom component, such as the About page, can be seen as a directive too. The ngIf condition is a built-in directive in Angular. It is a custom attribute that displays the content if the specified value is true.

The template tag

If a piece of a component needs to be shown a variable an amount of times, you can wrap it in a template tag. Using the ngIf (or ngFor) directive, you can control how often it is shown (in case of ngIf, once or zero times). The template tag will look like this:

<template [ngIf]="collapsed"> 
  <div>Content</div> 
</template>

You can abbreviate this as follows...

Using modules

We will use modules in all applications in this book. Modules (also called external modules and ES2015 modules) are a concept of separating code in multiple files. Every file is a module. Within these modules, you can use variables, functions, and classes (members) exported by other modules and you can make some members visible for other modules. To use other modules, you must import them, and to make members visible, you need to export them. The following example will show some basic usage:

// x.ts 
import { one, add, Lorem } from './y'; 
console.log(add(one, 2)); 
 
var lorem = new Lorem(); 
console.log(lorem.name); 
 
// y.ts 
export var one = 1; 
export function add(a: number, b: number) { 
  return a + b; 
} 
export class Lorem { 
  name = "ipsum"; 
}

You can export declarations by prefixing them with the export keyword or by prefixing them with export default. A default export should be imported...

Setting up the project

We will quickly set up the project before we can start writing. We will use npm to manage our dependencies and gulp to build our project. These tools are built on NodeJS, so it should be installed from nodejs.org.

First of all, we must create a new directory in which we will place all files. We must create a package.json file used by npm:

{ 
  "name": "weather-widget", 
  "version": "1.0.0", 
  "private": true, 
  "description": "" 
}

The package.json file contains information about the project, such as the name, version, and a description. These fields are used by npm when you publish a project on the registry on NPM, which contains a lot of open source projects. We will not publish it there. We set the private field to true, so we cannot accidentally publish it.

Directory structure

We will separate the TypeScript sources from the other files. The TypeScript files will be added in the lib directory. Static files, such as HTML and CSS, will...

Creating the first component

Angular is based on components. Components are built with other components and normal HTML tags. Our application will have three components: the forecast page, the about page, and the whole widget. The widget itself, which is referenced in the HTML page, will use the other two widgets.

The widget will show the About page in the third tab, as you can see in the following screenshot:

The forecast component is shown in the first tab of the following screenshot. We will create the forecast and the widget later in this chapter.

The template

A component is a class decorated with some metadata. Decorators are functions that can modify a class or decorate it with some metadata. A simple component that does not have any interaction will look like this:

import { Component } from "angular2/core"; 
 
@Component({ 
  selector: "about-page", 
template: ` 
    <h2>About</h2> 
    This widget shows the weather forecast of Utrecht. 
...

Adding conditions to the template

The event handler in the previous section sets the property collapsed to false but that does not modify the template. In normal code, we would have written if (this.collapsed) { ... }. In templates, we cannot use that, but we can use ngIf.

Directives

A directive is an extension to normal HTML tags and attributes. It can define custom behavior. A custom component, such as the About page, can be seen as a directive too. The ngIf condition is a built-in directive in Angular. It is a custom attribute that displays the content if the specified value is true.

The template tag

If a piece of a component needs to be shown a variable an amount of times, you can wrap it in a template tag. Using the ngIf (or ngFor) directive, you can control how often it is shown (in case of ngIf, once or zero times). The template tag will look like this:

<template [ngIf]="collapsed"> 
  <div>Content</div> 
</template>

You can abbreviate this as follows...

Using the component in other components

We can use the about-page component in other components, as if it was a normal HTML tag. But the component is still boring, as it will always say that it shows the weather broadcast of Utrecht. We can mark the location property as an input. After that, location is an attribute that we can set from other components. It is even possible to bind it as a one-way binding. The Input decorator, which we are using here, needs to be imported just like Component:

import { Component, Input } from "angular2/core"; 
 
@Component({ 
  ... 
}) 
export class About { 
  @Input()

  location: string = "Utrecht"; 
  collapsed = true; 
  show() { 
    this.collapsed = false; 
  } 
  hide() { 
    this.collapsed = true; 
  } 
 
  get encodedLocation() { 
    return encodeURIComponent(this.location); 
  } 
}
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Key benefits

  • Follow and build every featured projects to put the principles of TypeScript into practice
  • Learn how to use TypeScript alongside other leading tools such as Angular 2, React, and Node.js
  • Find out how to migrate your JavaScript codebase to TypeScript

Description

TypeScript is the future of JavaScript. Having been designed for the development of large applications, it is now being widely incorporated in cutting-edge projects such as Angular 2. Adopting TypeScript results in more robust software - software that is more scalable and performant. It's scale and performance that lies at the heart of every project that features in this book. The lessons learned throughout this book will arm you with everything you need to build some truly amazing projects. You'll build a complete single page app with Angular 2, create a neat mobile app using NativeScript, and even build a Pac Man game with TypeScript. As if fun wasn't enough, you'll also find out how to migrate your legacy codebase from JavaScript to TypeScript. This book isn't just for developers who want to learn - it's for developers who want to develop. So dive in and get started on these TypeScript projects.

Who is this book for?

This is for web developers committed to building better software. It's for web developers that know writing code should be fun - and that fun and creativity are the foundations of better software products.

What you will learn

  • Build quirky and fun projects from scratch
  • Use TypeScript with a range of different technologies such as Angular 2 and React
  • Migrate JavaScript codebases to TypeScript to improve your workflow
  • Write maintainable and reusable code
  • Using System.JS and Webpack to load scripts and their dependencies.
  • Developing highly performance server-side applications to run within Node.js
  • Reviewing high performant Node.js patterns and manage garbage collection
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Publication date : Jul 28, 2016
Length: 288 pages
Edition : 1st
Language : English
ISBN-13 : 9781785887017
Vendor :
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Category :
Web Development
Languages :
Typescript
Concepts :
Web Programming
Tools :
Angular

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Publication date : Jul 28, 2016
Length: 288 pages
Edition : 1st
Language : English
ISBN-13 : 9781785887017
Vendor :
Microsoft
Category :
Web Development
Languages :
Typescript
Concepts :
Web Programming
Tools :
Angular

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Table of Contents

10 Chapters
1. TypeScript 2.0 Fundamentals Chevron down icon Chevron up icon
1. TypeScript 2.0 Fundamentals
What is TypeScript?
Quick example
Learning modern JavaScript
Type checking
Summary
2. A Weather Forecast Widget with Angular 2 Chevron down icon Chevron up icon
2. A Weather Forecast Widget with Angular 2
Using modules
Setting up the project
Creating the first component
Adding conditions to the template
Using the component in other components
Showing a forecast
Creating the forecast component
The main component
Summary
3. Note-Taking App with a Server Chevron down icon Chevron up icon
3. Note-Taking App with a Server
Setting up the project structure
Getting started with NodeJS
Understanding the structural type system
Adding authentication
Testing the API
Adding CRUD operations
Writing the client side
Running the application
Summary
4. Real-Time Chat Chevron down icon Chevron up icon
4. Real-Time Chat
Setting up the project
Getting started with React
Writing the server
Connecting to the server
Creating the chat room
Comparing React and Angular
Summary
5. Native QR Scanner App Chevron down icon Chevron up icon
5. Native QR Scanner App
Getting started with NativeScript
Creating the project structure
Creating a Hello World page
Creating the main view
Adding a details view
Scanning QR codes
Adding persistent storage
Styling the app
Comparing NativeScript to alternatives
Summary
6. Advanced Programming in TypeScript Chevron down icon Chevron up icon
6. Advanced Programming in TypeScript
Using type guards
More accurate type guards
Checking null and undefined
Creating tagged union types
Comparing performance of algorithms
Summary
7. Spreadsheet Applications with Functional Programming Chevron down icon Chevron up icon
7. Spreadsheet Applications with Functional Programming
Setting up the project
Functional programming
Using data types for expressions
Writing unit tests
Parsing an expression
Defining the sheet
Using the Flux architecture
Creating actions
Writing the view
Advantages of Flux
Summary
8. Pac Man in HTML5 Chevron down icon Chevron up icon
8. Pac Man in HTML5
Setting up the project
Using the HTML5 canvas
Designing the framework
Drawing on the canvas
Adding utility functions
Creating the models
Drawing the view
Handling events
Creating the time handler
Running the game
Adding a menu
Summary
9. Playing Tic-Tac-Toe against an AI Chevron down icon Chevron up icon
9. Playing Tic-Tac-Toe against an AI
Creating the project structure
Adding utility functions
Creating the models
Implementing the AI using Minimax
Creating the interface
Testing the AI
Summary
10. Migrate JavaScript to TypeScript Chevron down icon Chevron up icon
10. Migrate JavaScript to TypeScript
Gradually migrating to TypeScript
Adding TypeScript
Migrating each file
Refactoring the project
Summary

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About the author

Profile icon de Wolff
de Wolff
Ivo Gabe de Wolff has been a freelance developer under the name of ivogabe since 2012 and he is studying mathematics and computing sciences at Utrecht University. When he was eleven, he started programming in Game Maker. Currently, he uses TypeScript on a daily basis. Recently, he has used TypeScript in lots of different environments, including mobile apps, servers, and command-line tools. Now he mainly specializes in NodeJS programming. Furthermore, he is the author of various open source projects, including gulp-typescript. You can find his projects on github.com/ivogabe. If you want to read more about TypeScript, JavaScript, gulp, or Functional Programming, you can take a look at his blog at dev.ivogabe.com.
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The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela