Instant apache wicket 6 pdf


 

Markup inheritance with the wicket:extend tag. Summary. 6 Keeping control over HTML. Hiding or disabling a component. Modifing tag attributes. PDF. • Zipped HTML. The code of the example application is kept in the . 4 import medical-site.infolication;. 5. 6. import medical-site.info; When Wicket was born there were MANY alternatives to it. medical-site.info has 4 Major active release (4, 5, 6, 7).

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Instant Apache Wicket 6 Pdf

Learn how to get started with Apache Wicket 6. Download this book in EPUB, PDF, MOBI formats; DRM FREE - read and interact with your. PDF for easy Reference Apache Wicket is a Java-based web application framework that has rapidly grown to be a favorite among many developers. It features. Instant Apache Wicket 6 is for people who want to learn the basics of Apache Wicket 6 and who already have some experience with Java and.

Rationale[ edit ] Traditional model-view-controller MVC frameworks work in terms of whole requests and whole pages. In each request cycle, the incoming request is mapped to a method on a controller object, which then generates the outgoing response in its entirety, usually by pulling data out of a model to populate a view written in specialized template markup. This keeps the application's flow-of-control simple and clear, but can make code reuse in the controller difficult. Wicket applications are trees of components, which use listener delegates to react to HTTP requests against links and forms in the same way that Swing components react to mouse and keystroke events. Wicket is categorized as a component-based framework. Each component is bound to a named element in the XHTML and becomes responsible for rendering that element in the final output. Using a special tag, a group of individual components may be abstracted into a single component called a panel, which can then be reused whole in that page, other pages, or even other panels. Each component is backed by its own model, which represents the state of the component. The framework does not have knowledge of how components interact with their models, which are treated as opaque objects automatically serialized and persisted between requests. More complex models, however, may be made detachable and provide hooks to arrange their own storage and restoration at the beginning and end of each request cycle. In Wicket, all server side state is automatically managed. You should never directly use an HttpSession object or similar wrapper to store state. Instead, state is associated with components. Each server-side page component holds a nested hierarchy of stateful components, where each component's model is, in the end, a POJO Plain Old Java Object Wicket aims for simplicity. There are no configuration files to learn in Wicket.

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Getting Started with Apache Wicket

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Section 1 About Apache Wicket Apache Wicket is a Java-based web application framework that has rapidly grown to be a favorite among many developers. Apache Wicket gives you a simple framework for creating powerful, reusable components and offers an object oriented methodology to web development while requiring only Java and HTML.

This Refcard covers Apache Wicket 1. Section 2 Project Layout The project layout most typical of Apache Wicket applications is based on the default Maven directories. Components can retrieve data from their model, and convert and store data in the model upon receiving an event. There are a variety of implementations of Model, and they all extend from the interface IModel. IModel There are only two methods that a class would have to implement to be a Model, and that is getObject and setObject.

The PropertyModel allows you to use a property expression to access a property in your domain object. Since most of the time, the property identifier you would give Wicket mimics that of the JavaBean property, this Model takes that implied association and makes it work for you.

Here are a few of the more useful:.

A Form in Wicket is a component that takes user input and processes it upon submission. This component is a logical holder of one or more input fields that get processed together.

Form input controls can each have their own Models attached to them, or can inherit from their parent, the Form. This is usually a good place to use CompoundPropertyModel as it gets rid of a lot of duplicate code. As you can see, each input component should be added to the Form element. Wicket also uses a redirect to buffer implementation details of form posts which gets around the form repost popup. The following behavior settings can be changed:. The following table lists all the different form components available, and how to use them with Models.

Any user input is processed through this flow:.

More than one validator can be added to a component if needed. For instance, if you have a password that needs to be within the range of 6 — 20 characters, must be alphanumeric and is required, simply chain the needed validators above to your component. Apache Wicket offers a facility to send back messages for failed validations or flash messages to provide notification of status after submitting a form or performing some action.

With that added to the queue, the most basic method of showing these to users is to use the FeedbackPanel component which you can add to your Page as follows:. Apache Wicket uses the same resource bundles standard in the Java platform, including the naming convention, properties file or XML file.

Another available option is to directly localize the filename of the markup files, i. Your default locale will be used for HomePage. Wicket in Action is an authoritative, comprehensive guide for Java developers building Wicketbased Web applications. Over a million developers have joined DZone.

Instant Apache Wicket 6 by João Sávio Ceregatti Longo, Felipe Fedel Pinto

Refcard Getting Started with Apache Wicket. Creating Standard Wicket Components Covers how to configure the framework, define your domain model, create standard Wicket components and add internationalization options.

SAVE PDF for easy Reference. Written by. Table of Contents. Section 1. Section 2. To get started, download either the wicket-quickstart project and modify it to your needs, or use the maven archetype here: Section 3. Section 4. IModel There are only two methods that a class would have to implement to be a Model, and that is getObject and setObject.

LoadableDetachableModel In order to make things easier, LoadableDetachableModel implements a very common use case for detachable models. Section 5. The following three distinct items make up every Wicket Component in some way: Link Below is a list of the different types of links, bookmarkable and non-bookmarkable, and how they are used to navigate from page-to-page. Custom The beauty of Wicket is that reuse is as simple as putting together a Panel of Components and adding it to any number of pages — this could be a login module, a cart, or whatever you think needs to be reused.

Section 6. The default Wicket implementation of a BookmarkablePage is not exactly easy to memorize, so in your custom Application class you can define several mount points for your pages:

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