Apache Wicket Cookbook by Igor Vaynberg

By Igor Vaynberg

This can be a hands-on functional consultant to a wide number of issues and use circumstances. This e-book attempts to exploit real-world examples while attainable, yet isn't really afraid to come back up with a contrived pretext if it makes explaining the matter less complicated. not like loads of different books, this one doesn't try and retain a continuing subject matter from bankruptcy to bankruptcy, comparable to demonstrating strategies at the comparable fictional software; doing so will be virtually very unlikely given the big variety of recipes offered the following. in its place, this booklet concentrates on targeted difficulties clients are inclined to come across and exhibits transparent ideas in a step by step demeanour. This publication attempts to coach by way of instance and isn't afraid to teach loads of code simply because, in any case, it truly is for coders. This publication is for present clients of the Apache Wicket framework; it isn't an creation to Wicket that might bore you with a whole bunch concept. you're anticipated to have outfitted or maintained an easy Wicket software long ago and to be seeking to study new and higher methods of utilizing Wicket. when you are able to take your Wicket talents to the subsequent point this publication is for you.

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Example text

Java public class HomePage extends WebPage { public HomePage(final PageParameters parameters) { add(new FeedbackPanel("feedback")); TextField< ? of("Password")); FormComponent< ? of("")); Form< ? add(password2); } } How to do it... 1. lengthBetween(5, 20)); add(new PatternValidator("[a-z]+")); } } 2. java TextField< ? add(new UsernameValidator()); How it works... wicket. validate(validatable); } } } The method loops over all validators that have been added and delegates validation to each one sequentially by invoking their IValidator#validate(IValidatable) method.

See also ff 32 See the Creating a custom validator recipe in this chapter on how to create field validators. 2 Getting Down and Dirty with Forms and Form Components In this chapter, we will cover: ff Creating linked selectboxes ff Composing multiple form components into a single reusable component ff Preventing multiple form submits ff Protecting against spam with a CAPTCHA Introduction In this chapter, we will cover a wide cross-section of use cases related to working with Wicket forms. We will see how to create form components that depend on each other, how to put form components into chunks that can be reused across forms, and even how to link components to JavaScript.

Add(new UsernameValidator()); How it works... wicket. validate(validatable); } } } The method loops over all validators that have been added and delegates validation to each one sequentially by invoking their IValidator#validate(IValidatable) method. If a validation error is detected, by checking the IValidatable#isValid() method, the loop is aborted and the validator returns. Using this trick it is trivial to compose low-level validators into higher-level validators that are reusable across forms and fields.

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