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Opa Application Development
Opa Application Development

Opa Application Development: A rapid and secure web development framework to develop web applications quickly and easily in Opa

By Li Wenbo
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Book Jun 2013 116 pages 1st Edition
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Product Details

Publication date : Jun 12, 2013
Length 116 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781782163749
Category :
Web Development
Languages :
Opa (Beginner)
Concepts :
Full Stack Web Development
Table of content icon View table of contents Preview book icon Preview Book

Opa Application Development

Chapter 1. Getting Started with Opa

This chapter shows how to install Opa and set its environment. A simple Opa program will also be shown to give a first glimpse of Opa programming.

Installing Opa

This section is about installation and configuration of Opa. You can get a more detailed installation guide that includes how to build Opa from source on Opa's webpage (https://github.com/MLstate/opalang/wiki/Getting-started). This section will give us brief instructions on how to install Opa compiler, Node.js, and some required modules for Node.js.

Installing Node.js

Node.js (http://nodejs.org) is a platform for building fast and scalable network applications. It is the backend of Opa (since Opa 1.0.0). We need to install Node.js first before installing Opa. The following are the steps to install Node.js on various operating systems:

  • Mac OS: Following are the steps to install Node.js:

    1. Download the latest .pkg package from http://nodejs.org/dist/latest/.

    2. Double-click on the package to install Node.js.

  • Ubuntu and Debian Linux: To install Node.js on Ubuntu and Debian Linux, type the following commands:

    $sudo apt-get install python-software-properties
$sudo add-apt-repository ppa:chris-lea/node.js
$sudo apt-get update
$sudo apt-get install nodejs npm

    Tip

    Downloading the example code files

    You can download the example code files for all Packt books you have purchased from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

  • Windows: The following are the steps to install Node.js:

    1. Download the latest .msi package from http://nodejs.org/dist/latest/.

    2. Double-click on the package to install Node.js on Windows.

Type the following commands to confirm your installation. If everything goes right, you will see the version information of Node.js and npm.

$ node -v
$ npm –v

Installing the required modules

There are several modules that are required by Opa to run an application. Type the following command to install these modules:

$ npm install -g mongodb formidable nodemailer simplesmtp imap

Installing the Opa compiler

The easiest solution for installing Opa is to download an installer from the Opa website (http://opalang.org/). You can also get the installer from Opa's GitHub repository (https://github.com/MLstate/opalang/downloads). At the time this book is being written, the latest version of Opa is 1.1.0.

Following are the steps to install Opa on various operating systems:

  • Mac OS X: Download the latest .dmg package and double-click on it to install. You will need the password of an administrative account.

  • Ubuntu and Debian Linux: Download the latest .deb package and double-click on it to install. You can also install it with the following command line:

    $sudo dpkg –i opa-1.1.0.x86.deb

  • Windows: Download the latest .exe file and double-click on it to install. Note that only 64-bit packages are available for Windows at this time.

  • Other Linux: To install Opa follow these steps:

    1. Download the latest .run package for Linux.

    2. Go to the download folder and add an execution privilege to the downloaded file by running the following command:

      $ chmod a+x opa-1.1.0.x64.run

    3. Run the installing script:

      $ sudo ./opa-1.1.0.x64.run

Testing the installation

To test if Opa is installed properly on your computer, run the following command:

$ opa --version

Opa is installed properly if the version information of the Opa compiler is printed.

Setting up editors

You can write Opa codes with any text editor you like, but a good editor can make coding easier. This section is about setting up editors you may commonly use. For now, Sublime Text is the most complete Integrated Development Environment (IDE) for Opa.

Sublime Text

Sublime Text (http://www.sublimetext.com/) is a sophisticated text editor for code, markup, and prose. You can download and try Sublime Text for free from http://www.sublimetext.com/2.

There is an Opa plugin that offers syntax highlighting, code completion, and some other features. To install the plugin, follow these steps:

  1. Get the plugin from https://github.com/downloads/MLstate/OpaSublimeText/Opa.sublime-package.

  2. Move it to ~/.config/sublime-text2/Installed Packages/ (in Linux), or %%APPDATA%%\Sublime Text 2\Installed Packages\ (in Windows), or ~/Library/Application Support/Sublime Text 2/Installed Packages (in Mac).

  3. Start Sublime and check if the menu entry (View | Syntax | Opa) is present. If everything goes well, the file with the .opa extension should automatically have its syntax highlighted. If not, please make sure you are using the Opa plugin (View | Syntax | Opa). We can navigate to Edit | Line | Reindent to auto-indent the Opa code.

Vim

Vim (http://www.vim.org/) is a highly configurable text editor, freely available for many different platforms. The Opa installation package provides a mode for Vim at /usr/share/opa/vim/ (for Linux) or /opt/mlstate/share/opa/vim/ (for Mac OS). To enable Vim to detect Opa syntax, copy these files to your .vim directory in your home folder (create it if it does not exist already):

  • On Linux, type the following command:

    $cp –p /usr/share/opa/vim/* ~/.vim/

  • On Mac OS, type the following command:

    $cp –p /opt/mlstate/share/opa/vim/* ~/.vim

Emacs

On Mac OS X, you can either use Aquamacs and the package installation will take care of it, or you should add the following line to your configuration file (which might be ~/.emacs; create it if it does not exist already):

(autoload 'opa-classic-mode "/Library/Application Support/Emacs/site-lisp/opa-mode/opa-mode.el" "Opa CLASSIC editing mode." t)
(autoload 'opa-js-mode "/Library/Application Support/Emacs/site-lisp/opa-mode/opa-js-mode.el" "Opa JS editing mode." t)
(add-to-list 'auto-mode-alist '("\.opa$" . opa-js-mode))
(add-to-list 'auto-mode-alist '("\.js\.opa$" . opa-js-mode))
(add-to-list 'auto-mode-alist '("\.classic\.opa$" . opa-classic-mode))

On Linux, add the following lines to your configuration file:

(autoload 'opa-js-mode "/usr/share/opa/emacs/opa-js-mode.el" "Opa JS editing mode." t)
(autoload 'opa-classic-mode "/usr/share/opa/emacs/opa-mode.el" "Opa CLASSIC editing mode." t)
(add-to-list 'auto-mode-alist '("\.opa$" . opa-js-mode))
(add-to-list 'auto-mode-alist '("\.js\.opa$" . opa-js-mode))
(add-to-list 'auto-mode-alist '("\.classic\.opa$" . opa-classic-mode))

For Eclipse, the experimental plugin is available at https://github.com/MLstate/opa-eclipse-plugin.

Your first Opa application

As a first example, here is the most simple program in Opa:

jlog("hello Opa!")

Compile and run it:

$ opa hello.opa -o hello.js
$ ./hello.js

Note

We can type opa hello.opa -- to compile and run the code in a single line.

The code does nothing but prints hello Opa on your screen. If you can see this message, it means Opa is working properly on your machine.

Summary

In this chapter, we learned how to install Opa, set up a proper editor, and write our first Opa program. In the next chapter, we will have a brief look at the basic grammar of the Opa language.

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Page 1 of 5

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Key benefits

  • Discover the Opa framework in a progressive and structured way
  • Build secure, powerful web applications with Opa.
  • Create three complete web application demos with Opa.

Description

Opa is a full-stack Open Source web development framework for JavaScript that lets you write secure and scalable web applications. It generates standard Node.js/MongoDB applications, natively supports HTML5 and CSS and automates many aspects of modern web application programming. It handles all aspects of web programming written in one consistent language and compiled to web standards.Opa Application Development is a practical,hands-on guide that provides you with a number of step-by-step exercises. It covers almost all aspects of developing a web application with Opa, which will help you take advantage of the real power of Opa, as well as building a secure, powerful web application rapidly.Opa Application Development dives into all concepts and components required to build a web application with Opa. The first half of this book shows you all of the basic building blocks that you will need to develop an Opa application, including the syntax of Opa, web development aspects, client and server communication and slicing, plugin, database, and so on. By the end of the book you will have yourself created a complete web application along with a game: Pacman!

What you will learn

Set up Opa development environment Develop a web application, manipulate DOM and CSS. Use bootstrap in Opa, including classes, icons and widgets. Slice client and server code. Bind JavaScript and Nodejs to Opa and build a plugin. Store, update and query data in database with MongoDB as the backend. Build a chat application, LiveRoom application in Opa. Handle image and audio with canvas to build a Pacman game

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
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
Buy Now

Product Details

Publication date : Jun 12, 2013
Length 116 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781782163749
Category :
Web Development
Languages :
Opa (Beginner)
Concepts :
Full Stack Web Development

Table of Contents

18 Chapters
Opa Application Development Chevron down icon Chevron up icon
Opa Application Development
Credits Chevron down icon Chevron up icon
Credits
About the Author Chevron down icon Chevron up icon
About the Author
About the Reviewers Chevron down icon Chevron up icon
About the Reviewers
www.PacktPub.com Chevron down icon Chevron up icon
www.PacktPub.com
Preface Chevron down icon Chevron up icon
Preface
Getting Started with Opa Chevron down icon Chevron up icon
Getting Started with Opa
Installing Opa
Setting up editors
Your first Opa application
Summary
Basic Syntax Chevron down icon Chevron up icon
Basic Syntax
Basic datatypes
Functions
Data structures
Pattern matching
Text parsers
Summary
Developing Web Applications Chevron down icon Chevron up icon
Developing Web Applications
Starting a web server
Dispatching requests
Preparing pages
Manipulating DOMs
Summary
Using Bootstrap Chevron down icon Chevron up icon
Using Bootstrap
Importing Bootstrap
Using classes
Using icons
Using widgets
Summary
Communicating between Client and Server Chevron down icon Chevron up icon
Communicating between Client and Server
Client and server slicing
Client and server communication
Summary
Binding with Other Languages Chevron down icon Chevron up icon
Binding with Other Languages
Binding JavaScript
Binding Node.js
Binding external functions using the classic syntax
Summary
Working with Databases Chevron down icon Chevron up icon
Working with Databases
A quick start to MongoDB
Database manipulation
Querying data
Summary
Internationalization Chevron down icon Chevron up icon
Internationalization
Internal approach
External approach
Summary
Building a Chat Application Chevron down icon Chevron up icon
Building a Chat Application
Creating a project
Launching the web server
Designing user interface
Building application logic
Broadcasting and receiving messages
Summary
Building a Game – Pacman Chevron down icon Chevron up icon
Building a Game – Pacman
The project structure
The HTML5 Canvas
Drawing a shape
Drawing an image
Drawing the text
Binding the external JavaScript library
Summary
Developing a Social Mobile Application – LiveRoom Chevron down icon Chevron up icon
Developing a Social Mobile Application – LiveRoom
Project structure
Authorizing a user
The application
Summary
Index Chevron down icon Chevron up icon
Index

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Authors (1)

Profile icon Li Wenbo
Li Wenbo studied Computer Science and Technology at Wuhan University, graduating with a master's degree. He has two years experience working as a Software Engineer in a leading telecom company in China. He has been doing web development for about 8 years, ever since he was a student at Wuhan University. He is familiar with a lot of programming languages such as C/C++, Java, JavaScript, PHP, and so on, and he has a passion for new things and technologies. Li tried the Opa framework last year and found it very interesting. He then participated in an Opa challenge and won the first prize. Li Wenbo is now a freelance developer and owns a small studio in Wuhan, China.
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