By Igor Vaynberg
It is a hands-on functional consultant to a wide number of issues and use circumstances. This e-book attempts to take advantage of real-world examples while attainable, yet isn't afraid to return up with a contrived pretext if it makes explaining the matter easier. not like loads of different books, this one doesn't try and continue a continual subject matter from bankruptcy to bankruptcy, corresponding to demonstrating options at the similar fictional software; doing so will be virtually most unlikely given the wide range of recipes awarded the following. as a substitute, this booklet concentrates on targeted difficulties clients tend to come across and indicates transparent suggestions in a step by step demeanour. This booklet attempts to coach through instance and isn't afraid to teach loads of code simply because, in the end, it really is for coders. This e-book is for present clients of the Apache Wicket framework; it isn't an creation to Wicket that would bore you with hundreds thought. you're anticipated to have outfitted or maintained an easy Wicket program long ago and to be seeking to research new and higher methods of utilizing Wicket. while you are able to take your Wicket talents to the following point this e-book is for you.
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Additional resources for Apache Wicket Cookbook
1. getFirst()) && Strings. getFirst()) || Strings. properties BothNamesFilledInValidator=Both first name and last name must be filled in 2. java FormComponent
It is better to stick to the DRY (don't repeat yourself) principle and have only one place in code that governs this constraint. Pitfalls of not externalizing validation constraints Some developers prefer to achieve the same usecase by creating a subclass of the FormComponent instead of the CompoundValidator. lengthBetween(5, 20)); } } While this does not violate the DRY principle for our particular usecase, it does somewhat limit the further composability and reusability of the validation code.
When a component needs to present its model object as a part of html markup, it first runs it through the conversion infrastructure to convert it to a string. When a component needs to convert a user's input, which is typically a string, back to a model object it once again runs it through the conversion infrastructure, this time to convert the string value back to the object. IConverter the interface, and a converter locator responsible for finding converters that can convert from an object of the given class to a string and back.
Apache Wicket Cookbook by Igor Vaynberg