Book Image

Opa Application Development

By : Li Wenbo
Book Image

Opa Application Development

By: Li Wenbo

Overview of this book

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!
Table of Contents (18 chapters)
Opa Application Development
About the Author
About the Reviewers

Creating a project

To begin developing our chat application, we need to create an Opa project using the following Opa command:

opa create chat

This command will create an empty Opa project. Also, it will generate the required directories and files automatically with the structure as shown in the following screenshot:

Let's have a brief look at what these source code files do:

  • controller.opa: This file serves as the entry point of the chat application; we start the web server in controller.opa

  • view.opa: This file serves as an user interface

  • model.opa: This is the model of the chat application; it defines the message, network, and the chat room

  • style.css: This is an external stylesheet file

  • Makefile: This file is used to build an application

As we do not need database support in the chat application, we can remove --import-package stdlib.database.mongo from the FLAG option in Makefile. Type make and make run to run the empty application.