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

Client and server slicing

Opa allows developers to write the server and client code both in the same language within the same module. And even better, the Opa slicer automates the calls between the client and the server. No more manually written Ajax calls or value serialization is needed!

A simple example

Let's get started with a simple example. Suppose we want to send our name to the server and request the server to respond with the words "Say hello to [name] from server":

This is quite simple and can be accomplished with almost any language that we are familiar with. Typically, you would send an Ajax request to the server with name as request data, and the server will respond with a JSON object containing the string we want. The following code fragment demonstrates how we can do this using jQuery for the client-side code and ASP as server-side code:

//code fragment on server side: ajax.aspx
Response.ContentType = "application/json";
Response.Write("{result: 'Say hello to " 
+ Request["Name...