Download Apache Wicket Cookbook by Igor Vaynberg PDF

By Igor Vaynberg

ISBN-10: 1849511608

ISBN-13: 9781849511605

This can be a hands-on functional advisor to a wide number of themes and use situations. This e-book attempts to exploit real-world examples whilst attainable, yet isn't afraid to return 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 continue a continual subject matter from bankruptcy to bankruptcy, corresponding to demonstrating ideas at the comparable fictional program; doing so will be nearly most unlikely given the big variety of recipes provided the following. as a substitute, this publication concentrates on centred difficulties clients tend to stumble upon and exhibits transparent strategies in a step by step demeanour. This publication attempts to educate through instance and isn't afraid to teach loads of code simply because, finally, it truly is for coders. This e-book is for present clients of the Apache Wicket framework; it isn't an advent to Wicket that might bore you with lots of idea. you're anticipated to have equipped or maintained an easy Wicket software long ago and to be trying to study new and higher methods of utilizing Wicket. while you're able to take your Wicket talents to the subsequent point this e-book is for you.

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Add(new PatternValidator("[a-z]+")); But, it is important to consider the implications: ff It is easy to forget to add one of the constraints; sometimes fields will have five or six constraints that make up their overall validation. In these cases it is very easy to leave off a constraint or two which will cause a headache down the road. 21 Validating and Converting User Input ff What happens if the business logic governing the validation constraint changes? We would need to find all the places in our code where the username field is used so we can update it to use the new constraint.

GetHour(), time. isAm()) ? "am" 26 Chapter 1 : "pm")); } } 3. class; } @Override protected IConverterLocator newConverterLocator() { ConverterLocator locator = (ConverterLocator)super. class, new TimeConverter()); return locator; } } 6. java public class HomePage extends WebPage { private Time time; public HomePage(final PageParameters parameters) { TextField

SetMetaData(PROCESSED, tokens); } } When implementing updateProcessedForms() we first check if there were errors processing the current form, and if there were, we do not record the form as processed. Next we create a token to represent the form and store it in a list and then store the list in session. Now that we can record submitted forms we can check if the form has already been submitted. contains(token)) { return true; } } return false; } We complete our recipe with step 6 where we replace the use of a normal Form with our SubmitOnceForm.

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