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

Importing Bootstrap

We have talked about how to import external files (JavaScript, CSS, among others) in the Resource handler section of Chapter 3, Developing Web Applications. We would have to import all the necessary Bootstrap files if we do that manually. To make it easy, Opa provides some shortcuts for using Bootstrap. Let's get started with an example:

import stdlib.themes.bootstrap
function page(){
  <button class="btn btn-primary"style="margin:5px">Click</button>
Server.start(Server.http,{title:"Opa Packt",~page})

All we need is an import statement, and Opa will handle the rest. The result of the above code looks as shown in the following screenshot. We can see that the Click button is rendered using the btn and the btn-primary class, which are provided by Bootstrap.

Actually, we can control the importing in more detail. By doing this, we can prevent loading unnecessary resources and only load what we need. Refer to the following import statements to do this:

// import bootstrap...