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Home > Web Development > Front End Web Development > NW.js Essentials
NW.js Essentials
NW.js Essentials

NW.js Essentials: Build native desktop applications for Windows, Mac OS, or Linux using the latest web technologies

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NW.js Essentials

Chapter 2. NW.js Native UI APIs

As we have seen in the first chapter, it is incredibly easy to build desktop applications out of a simple HTML page but, in order to really understand the power of NW.js, we have to push it a step further. We know that Node.js takes care of dealing with low-level system functionality while WebKit handles the window GUI and all the stuff you'd usually do in a web application, but there is still something missing.

In order to create a decent user experience, we need to give our users the feeling that they are dealing with a native desktop application with the ability to handle multiple windows, access the clipboard, or hide in the system tray. To sum up, our application needs to be fully integrated with the OS GUI.

This cannot be done by WebKit because of the API boundaries, nor can it be done by Node.js as it doesn't have access to the GUI, but fortunately, NW.js gives us the full thing, adding on top of the others a new layer of JavaScript...

The App API – the core of your applications

Eventually, we can dive deep into the actual code behind NW.js applications. The app API provides a useful set of functionalities, which you can leverage to access main information and events of your application. We shall start describing, one by one, all the functionalities provided.

Opening a file in your application natively

There are many ways to open files in an NW.js application; in this section, we're going to deal with the opening of binded file types. Let's say you're developing a text editor; you'd probably want .txt files to be associated with it.

Actually, the real binding is made on the packaging step described in Chapter 6, Packaging Your Application for Distribution, but to open a file using the OS functionality (for example, through the Open with contextual menu), we need to first be able to read the arguments passed when the application gets started.

As a matter of fact, when you choose to open a given...

The Window API – working with windows on NW.js

On NW.js, the Window API is nothing more than a wrapper of the DOM's window object giving an additional layer of functionality to play with the application windows. Many of the window methods described are inherited by the DOM window object. As we stated earlier, window is also an instance of Node.js EventEmitter giving you the ability to listen and respond to window events such as move or resize.

Instantiating a new window object

There are many ways to instantiate a window object. When you need to refer to the current window, all you have to do is to call the Window.get([window_object]) method leaving the attribute empty, as follows:

var gui = require('nw.gui');
var currentWindow = gui.Window.get();

In order to instantiate a different window object, you can proceed with passing the DOM window object to it through the get method:

var gui = require('nw.gui');
var extraWindow = gui.Window.get(
  window.open('window...

The Screen API – screen geometry functions

The Screen API has been lately added in order to better handle window sizing and positioning on single or multiple screens. Run the following code:

var gui = require('nw.gui');
gui.Screen.Init(); // Screen API is a Singleton
var screens = gui.Screen.screens;

You'll get an array of screen objects. Each screen object has the following structure:

screen {
  // unique id for a screen
  id : 69673536,

  // physical screen resolution
  bounds : {
    x : 0,
    y : 0,
    width : 1280,
    height : 800
  },

  // useable area within the screen bound
  work_area : {
    x : 0,
    y : 23,
    width : 1280,
    height : 773
  },
  scaleFactor : 1,
  isBuiltIn : false
}

You can easily access any of these properties in order to improve the user experience. Let's say, for example, that you want to position your window in the top-right corner of the screen. On Microsoft Windows, you would probably proceed as follows:

var gui = require...

The Menu API – handling window and context menus

In NW.js, menus can be used in three different contexts:

  • Contextual menus: This is displayed when right-clicking an element inside the application.
  • Window menus: On Microsoft Windows and Linux, you can have one per window; however, in Mac OS X, you can have one, which will be shown on the System taskbar, per application.
  • Tray icon menus: This is displayed when clicking on a tray icon usually on the right side of the OS taskbar.

In this chapter, we're going to deal with the first two contexts. For tray icon menus, the same basic rules apply, but refer to the Tray API section to learn more about it.

The contextual menu

In order to instance a new menu on NW.js, we should proceed as follows:

var gui = require('nw.gui');
var menu = new gui.Menu();

Once the menu has been created, we have to append one or more MenuItem objects to it:

menu.append(new gui.MenuItem({
  label: 'Menu Item'
}));

We have three different types of menu...

File dialogs – opening and saving files

Before talking about file dialogs, I have to do a little introduction. It is probably obvious, but while in the browser, file dialogs allow you to upload or download files, in NW.js, they do nothing but pass the path of the selected folder or files. So, any following operation will be done on the original file, not on a copy.

WebKit enables you to open file dialogs through the file input field but with many limitations due to security concerns. In NW.js, those limitations have been removed, and the default file input fields have been enhanced in order to give a full native user experience.

A faster way to open a file dialog is to add an event listener to the file input field as follows:

<input id="fileDialog" type="file">
<script>
document.querySelector('#fileDialog')
  .addEventListener("change", function() {
    var filePath = this.value;
    alert(filePath);
  });
</script>

In the preceding...

The App API – the core of your applications

Eventually, we can dive deep into the actual code behind NW.js applications. The app API provides a useful set of functionalities, which you can leverage to access main information and events of your application. We shall start describing, one by one, all the functionalities provided.

Opening a file in your application natively

There are many ways to open files in an NW.js application; in this section, we're going to deal with the opening of binded file types. Let's say you're developing a text editor; you'd probably want .txt files to be associated with it.

Actually, the real binding is made on the packaging step described in Chapter 6, Packaging Your Application for Distribution, but to open a file using the OS functionality (for example, through the Open with contextual menu), we need to first be able to read the arguments passed when the application gets started.

As a matter of fact, when you choose to open a given file with an application, here...

The Window API – working with windows on NW.js

On NW.js, the Window API is nothing more than a wrapper of the DOM's window object giving an additional layer of functionality to play with the application windows. Many of the window methods described are inherited by the DOM window object. As we stated earlier, window is also an instance of Node.js EventEmitter giving you the ability to listen and respond to window events such as move or resize.

Instantiating a new window object

There are many ways to instantiate a window object. When you need to refer to the current window, all you have to do is to call the Window.get([window_object]) method leaving the attribute empty, as follows:

var gui = require('nw.gui');
var currentWindow = gui.Window.get();

In order to instantiate a different window object, you can proceed with passing the DOM window object to it through the get method:

var gui = require('nw.gui');
var extraWindow = gui.Window.get(
  window.open('window.html');
);

Otherwise, use the Window...

The Screen API – screen geometry functions

The Screen API has been lately added in order to better handle window sizing and positioning on single or multiple screens. Run the following code:

var gui = require('nw.gui');
gui.Screen.Init(); // Screen API is a Singleton
var screens = gui.Screen.screens;

You'll get an array of screen objects. Each screen object has the following structure:

screen {
  // unique id for a screen
  id : 69673536,

  // physical screen resolution
  bounds : {
    x : 0,
    y : 0,
    width : 1280,
    height : 800
  },

  // useable area within the screen bound
  work_area : {
    x : 0,
    y : 23,
    width : 1280,
    height : 773
  },
  scaleFactor : 1,
  isBuiltIn : false
}

You can easily access any of these properties in order to improve the user experience. Let's say, for example, that you want to position your window in the top-right corner of the screen. On Microsoft Windows, you would probably proceed as follows:

var gui = require('nw.gui'),
  currentWindow...

The Menu API – handling window and context menus

In NW.js, menus can be used in three different contexts:

  • Contextual menus: This is displayed when right-clicking an element inside the application.

  • Window menus: On Microsoft Windows and Linux, you can have one per window; however, in Mac OS X, you can have one, which will be shown on the System taskbar, per application.

  • Tray icon menus: This is displayed when clicking on a tray icon usually on the right side of the OS taskbar.

In this chapter, we're going to deal with the first two contexts. For tray icon menus, the same basic rules apply, but refer to the Tray API section to learn more about it.

The contextual menu

In order to instance a new menu on NW.js, we should proceed as follows:

var gui = require('nw.gui');
var menu = new gui.Menu();

Once the menu has been created, we have to append one or more MenuItem objects to it:

menu.append(new gui.MenuItem({
  label: 'Menu Item'
}));

We have three different types of menu items: normal (default value...

File dialogs – opening and saving files

Before talking about file dialogs, I have to do a little introduction. It is probably obvious, but while in the browser, file dialogs allow you to upload or download files, in NW.js, they do nothing but pass the path of the selected folder or files. So, any following operation will be done on the original file, not on a copy.

WebKit enables you to open file dialogs through the file input field but with many limitations due to security concerns. In NW.js, those limitations have been removed, and the default file input fields have been enhanced in order to give a full native user experience.

A faster way to open a file dialog is to add an event listener to the file input field as follows:

<input id="fileDialog" type="file">
<script>
document.querySelector('#fileDialog')
  .addEventListener("change", function() {
    var filePath = this.value;
    alert(filePath);
  });
</script>

In the preceding example, a default file input field will...

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Description

If you are an experienced Node.js developer who wants to create amazing desktop applications using NW.js, this is the book for you. Prior knowledge of HTML5, jQuery, and CSS is assumed.

Who is this book for?

If you are an experienced Node.js developer who wants to create amazing desktop applications using NW.js, this is the book for you. Prior knowledge of HTML5, jQuery, and CSS is assumed.

What you will learn

  • Develop a fully working NW.js desktop application from scratch
  • Take advantage of thirdparty tools to simplify the packaging process of NW.js applications
  • Create an astonishing user experience using Native UI APIs
  • Debug NW.js applications with Chromium DevTools, Crash dump log files, and thirdparty debugging tools
  • Package and deploy NW.js applications on Microsoft Windows, Mac OS X, and Linux
  • Take advantage of Browser Web APIs, expanding on data persistence solutions and security
  • Avoid common programming mistakes by integrating prior knowledge of Node.js with NW.js development
Estimated delivery fee Deliver to India

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Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 25, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781785280863
Category :
Web Development
Languages :
JavaScript
Concepts :
Front End Web Development

What do you get with Print?

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Product feature icon Paperback book shipped to your preferred address
Product feature icon Redeem a companion digital copy on all Print orders
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR

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Estimated delivery fee Deliver to India

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Product Details

Publication date : May 25, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781785280863
Category :
Web Development
Languages :
JavaScript
Concepts :
Front End Web Development

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NW.js Essentials
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Table of Contents

10 Chapters
1. Meet NW.js Chevron down icon Chevron up icon
1. Meet NW.js
NW.js under the hood
Features and drawbacks of NW.js
Downloading and installing NW.js
Development tools
Writing and running your first "Hello World" app
Summary
2. NW.js Native UI APIs Chevron down icon Chevron up icon
2. NW.js Native UI APIs
The App API – the core of your applications
The Window API – working with windows on NW.js
The Screen API – screen geometry functions
The Menu API – handling window and context menus
File dialogs – opening and saving files
Opening files through file dragging
The Tray API – hide your application in plain sight
The Clipboard API – accessing the system clipboard
The Shell API – platform-dependent desktop functions
Summary
3. Leveraging the Power of Node.js Chevron down icon Chevron up icon
3. Leveraging the Power of Node.js
Routing and templating in NW.js
Node.js global and process objects
The window object
Using NW.js' main module
Handling paths in NW.js
NW.js context issues
Working with Node.js modules
Summary
4. Data Persistence Solutions and Other Browser Web APIs Chevron down icon Chevron up icon
4. Data Persistence Solutions and Other Browser Web APIs
Data persistence solutions
XMLHttpRequest and BLOBs
Handling media files
Shedding some light on security issues
The Web Notifications API
Summary
5. Let's Put It All Together Chevron down icon Chevron up icon
5. Let's Put It All Together
Let's get started!
A matter of style
The HTML5 skeleton
Let's dive deep into the application logic
The application layer
The NativeUI layer
Summary
6. Packaging Your Application for Distribution Chevron down icon Chevron up icon
6. Packaging Your Application for Distribution
The manifest file
The general logic behind the packaging procedure
Packaging NW.js applications for Mac OS X
Packaging NW.js applications for Microsoft Windows
Packaging NW.js applications for Linux
Securing your source code
About NW.js application licensing
Summary
7. Automated Packaging Tools Chevron down icon Chevron up icon
7. Automated Packaging Tools
Web2Executable
node-webkit-builder and grunt-node-webkit-builder
generator-node-webkit
Summary
8. Let's Debug Your Application Chevron down icon Chevron up icon
8. Let's Debug Your Application
Remote debugging
The DevTools API
Live reloading NW.js
Troubleshooting common issues
Summary
9. Taking Your Application to the Next Level Chevron down icon Chevron up icon
9. Taking Your Application to the Next Level
NW.js boilerplates
Development ideas
Resources and tutorials
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.8
(5 Ratings)
5 star 80%
4 star 20%
3 star 0%
2 star 0%
1 star 0%
Pascal Jul 13, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Really enjoyed the book. If your are looking for a good crash course on NW.js this is your book. Cover all main aspects of working with NW.js and the pitfalls to avoid. Cover working with it on 3 platforms (Linux, OSX, Windows) and the little gotchas on each.
Amazon Verified review Amazon
Nikolay Gechev Oct 27, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book is great for web developers. Many things nesesery to build desktop application are presented. Enaph to start project.
Amazon Verified review Amazon
Julio Cezar Gonçalves de Freitas Aug 14, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book. Cover how to create graphical application in linux, windows and macos!
Amazon Verified review Amazon
PDG Dec 13, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book explains very well and in a progressive way how to develop desktop applications using web technologies and the NW.js framework. It's easy to read and to follow.
Amazon Verified review Amazon
Josue Martinez Jul 10, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This is a book that is helping me to understand how to build desktop application using Node.js , is awesome what you can build and how you can interact with the local system.I was looking for another option to build desktop applications, and i didn't what to use Java swing or .Net. Also this help me to understand how i can re-use some of the modules I already have for other Node.js application I already develop, so I'm happy because i didn't have to wite everything again, Nice and well explained book ,Thanks
Amazon Verified review Amazon

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About the author

Profile icon Benoit
Benoit
Alessandro Benoit is a 31-year-old web developer from Italy. He currently works both with backend and frontend technologies, ranging from PHP development, mostly on WordPress and Laravel, to web design and building open source jQuery plugins. He's also an early adopter of NW.js and the developer of Nuwk!, an open source application that simplifies the building process of NW.js applications on Mac OS X.
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FAQs

What is the digital copy I get with my Print order? Chevron down icon Chevron up icon

When you buy any Print edition of our Books, you can redeem (for free) the eBook edition of the Print Book you’ve purchased. This gives you instant access to your book when you make an order via PDF, EPUB or our online Reader experience.

What is the delivery time and cost of print book? 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
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

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