JSR 303 Bean Validation + Javascript Client-Side Validation

Question

What is the best way to perform client-side form validation using Javascript (with minimal code duplication) when using JSR 303 bean validation on the server side? I'm currently using Spring 3 and the Hibernate Validator.

Answer 1

I would suggest that you look at Spring JS, which relies heavily on Dojo. A tutorial can be found here.

Easiest way for yourself to start playing with it is to download Spring Roo, create the petclinic sample application with one of the example-scripts (this takes you 5 minutes) and then play around with how the javascript is integrated. Spring Roo creates an app with the same technology stack that you use (Spring+hibernate+implementation of jsr 303)

Answer 2

I found this open source project but it looks dead, maybe it is worth resurrecting.

http://kenai.com/projects/jsr303js/pages/Home

This library provides client side validation of an HTML form based on JSR-303 and Hibernate Validator annotations, integrated with Spring MVC. The library provides a JavaScript validation code base that handles basic interaction with HTML forms, as well as JavaScript functions implementing the validation annotations supported by Hibernate Validator (including those not from the JSR-303 spec). This JavaScript code base can be included in a page by using a provided taglib or by extracting the JavaScript file from the jar and including it using a tag. Once this code base has been included in a page, a second taglib is used to generate the JavaScript code for validating an HTML form. You can also provide a JSON object in the body of the tag to specify additional configuration information.