Book Image

Apache Wicket Cookbook

By : Igor Vaynberg
Book Image

Apache Wicket Cookbook

By: Igor Vaynberg

Overview of this book

<p>Apache Wicket is one of the most famous Java web application frameworks. Wicket simplifies web development and makes it fun. Are you bored of going through countless pages of theory to find out how to get your web development done? With this book in hand, you don't need to go through hundreds of pages to figure out how you will actually build a web application. You will get practical solutions to your common everyday development tasks to pace up your development activities.</p> <p><i>Apache Wicket Cookbook</i> provides you with information that gets your problems solved quickly without beating around the bush. This book is perfect for you if you are ready to take the next step from tutorials and step into the practical world. It will take you beyond the basics of using Apache Wicket and show you how to leverage Wicket's advanced features to create simpler and more maintainable solutions to what at first may seem complex problems.</p> <p>You will learn how to integrate with client-side technologies such as JavaScript libraries or Flash components, which will help you to build your application faster. You will discover how to use Wicket paradigms to factor out commonly used code into custom Components, which will reduce the maintenance cost of your application, and how to leverage the existing Wicket Components to make your own code simpler.</p>

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Apache Wicket Cookbook
Igor Vaynberg
Mar, 2011 | 312 pages
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Table of Contents (18 chapters)
Apache Wicket Cookbook
Apache Wicket Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Validating and Converting User Input
Validating and Converting User Input
Introduction
Performing form-level custom validation
Creating a custom validator
Composing multiple validators into a single reusable validator
Converting string inputs to objects
2
Getting Down and Dirty with Forms and Form Components
Getting Down and Dirty with Forms and Form Components
Introduction
Creating linked selectboxes
Composing multiple form components into a single reusable component
Preventing multiple form submits
Protecting against spam with a CAPTCHA
3
Making Forms Presentable
Making Forms Presentable
Introduction
Changing form component CSS class on validation errors
Using FeedbackPanel to output form component specific messages
Streamlining form component presentation using behaviors
4
Taking your Application Abroad
Taking your Application Abroad
Introduction
Storing module resource strings in package properties
Retrieving a localized string
Feeding dynamic localized strings to components using StringResourceModel
Using wicket:message to output localized markup
Overriding localized resources on a case by case basis
5
Displaying Data Using DataTable
Displaying Data Using DataTable
Introduction
Sorting
Filtering
Making cells clickable
Making rows selectable with checkboxes
Exporting data to CSV
6
Enhancing your UI with Tabs and Borders
Enhancing your UI with Tabs and Borders
Introduction
Creating tabs with dynamic titles
Making a tabbed panel play nice with forms
Creating a client-side JavaScript tabbed panel
Using borders to decorate components
Creating a collapsible border
7
Deeper into Ajax
Deeper into Ajax
Introduction
Adding Ajax validation to individual form components
Blocking until an Ajax request is complete
Providing Ajax feedback automatically
8
Visualizing Data with Charts
Visualizing Data with Charts
Introduction
Charting with Open Flash Chart
Feeding chart data using a SharedResource
Responding to clicks
9
Building Dynamic and Rich UI
Building Dynamic and Rich UI
Introduction
Swapping components using a select box
Creating dynamic forms
Creating a dynamic portal layout
10
Securing your Application
Securing your Application
Introduction
Creating a login page and forcing the user to log in
Authenticating with OpenID
Securing components using IAuthorizationStrategy
Securing URLs and protecting against cross-site request forgery
Switching from HTTP to HTTPS and back again
11
Integrating Wicket with Middleware
Integrating Wicket with Middleware
Introduction
Integrating with Spring
Integrating with CDI
Populating repeaters from a JPA query
Creating a model for a JPA entity
Index
Index

Feeding chart data using a SharedResource

In this recipe, we will see how to feed data to the OFC chart using a SharedResource. The advantage of this technique, over using a component-callback, is that all charts on the page can get their data asynchronously because access to SharedResources is not synchronized to a single thread per page. This will reduce the total time to load the page and make the application feel more responsive. This will make a big difference when we have multiple charts on the page as follows:

Getting ready

Let's get started by implementing the chart by using a component callback to retrieve the data.

  1. Implement StockService that will feed us chart data; see the first recipe for code listing.

  2. Implement the Chart component. Refer to Chart.template and Chart.data.template in the code bundle for the data setup of the chart.

    Chart.java 

    public class Chart extends WebComponent
      implements IHeaderContributor, IResourceListener {

   public Chart(String id, IModel<String...
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