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
About the Author
About the Reviewers

Time for action – fixing the OptionGroup example

It's time for our good deed of the day. OptionGroup has a very simple method to turn on a multiple selection mode: setMultiSelect.

  1. Open or import the optiongroup example in your IDE.

  2. Add og.setMultiSelect(true) after instantiating og.

  3. Deploy and run the example.

What just happened?

Take a look at the new interface:

As you can see, now the component is displayed as an assortment of checkboxes and the getValue method (of both OptionGroup and Property) returns a Java Collection (actually a Set). This happens when we activate multiselect mode.


We are not talking about Java EE, but just in case, the correct answers are:

Session beans and Message-driven beans

Have a go hero – improve the OptionGroup example

Try changing the OptionGroup example application to show a message informing whether the answer is correct or not. Here is a quick hint: cast the value to a Java Set instance.

Twin column selects

Instead of the OptionGroup component we can use TwinColSelect...