Book Image

Vaadin 7 UI Design By Example: Beginner's Guide

Book Image

Vaadin 7 UI Design By Example: Beginner's Guide

Overview of this book

Vaadin is a mature, open-source, and powerful Java framework used to build modern web applications in plain Java. Vaadin brings back the fun of programming UI interfaces to the web universe. No HTML, no CSS, no JavaScript, no XML. Vaadin lets you implement web user interfaces using an object oriented model, similar to desktop technologies such as Swing and AWT. Vaadin 7 UI Design By Example: Beginner's Guide is an engaging guide that will teach you how to develop web applications in minutes. With this book, you will Develop useful applications and learn basics of Java web development. By the end of the book you will be able to build Java web applications that look fantastic. The book begins with simple examples using the most common Vaadin UI components and quickly move towards more complex applications as components are introduced chapter-by-chapter. Vaadin 7 UI Design By Example: Beginner's Guide shows you how to use Eclipse, Netbeans, and Maven to create Vaadin projects. It then demonstrates how to use labels, text fields, buttons, and other input components. Once you get a grasp of the basic usage of Vaadin, the book explains Vaadin theory to prepare you for the rest of the trip that will enhance your knowledge of Vaadin UI components and customization techniques.
Table of Contents (17 chapters)
Vaadin 7 UI Design By Example Beginner's Guide
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Remote procedure calls


Are you wondering how a widget can send a message to the related server component? If you have been curious, you might have noticed an addClickHandler method that you can use in your widget. That method seems to be appropriate. The problem is that by using this method you have to implement the click logic in the widget, which means that the click event will be handled in the client.

Remote Procedure Calls (RPC) will solve the problem. RPC are made through an interface that extends Vaadin's ServerRpc. For example:

public interface MarqueeLabelServerRpc extends ServerRpc {

  public void clicked();

}

Note

ServerRpc is used for communication from client to server. You have to extend ClientRpc if your communication is going from server to client though.

The previous interface declares a method that can be called from the client side. Normally, the call will be done from the connector (it makes sense to implement a connection feature in the connector, right?). To make the call...