@Nicolas thanks for your detailed response. I will see over it. kibu
Am Montag, 13. Januar 2014 08:59:02 UTC+1 schrieb Nicolas Weeger: > > Hello. > > > > when validating user input, each ui control that holds a faulty value > > should signal this by displaying a red border or something like this. > > Alternatively a list with all errors should be displayed on top of the > page > > like "Field '<name_of_control_a>' must not be empty", "Field > > '<name_of_control_b>' only accepts numbers" and so on. > > With bean validation, a pojo field must not refer directly to an ui > control > > value. But if so, how to extract the information from the error messages > > which ui control belongs to a particular message? You can do this by > hand. > > But there should be some automatism. > > > The Editor framework > http://www.gwtproject.org/doc/latest/DevGuideUiEditors.html combined with > the > Validation framework > http://www.gwtproject.org/doc/latest/DevGuideValidation.html should give > a > good start. > > > If the controls you use are ValueBoxEditorDecorator or implement > HasEditorError (or other types, not sure of the full list), they can > display > errors for their fields as reported from the Validation framework. > > > Assuming you got a Driver (here called "fieldBinder") for the field > binding, you > can do the following to validate your input and report back to the user > (Data > is your POJO class with validation): > > > final Data data = fieldBinder.flush(); > Validator validator = > Validation.buildDefaultValidatorFactory().getValidator(); > Set<ConstraintViolation<Data>> violations = validator.validate(data); > final Set<?> convert = violations; > // errors will link to their correct field > fieldBinder.setConstraintViolations((Set<ConstraintViolation<?>>) > convert); > if (!violations.isEmpty()) { > Window.scrollTo(0, 0); > final StringBuffer error = new StringBuffer(); > String sep = ""; > for (final ConstraintViolation<Data> violation : violations) { > if ("".equals(violation.getPropertyPath().toString())) { > error.append(violation.getMessage()).append(sep); > sep = " ; "; > } > } > if (error.length() > 0) { > showError(error.toString()); > } > return; > } > > > Two notes on that code: > - you need to use the Set<ConstraintViolation> for some obscure reason I > don't > remember (not totally compatible types?) > > - the loop on violations only takes errors without any path, to display > them > on top of the dialog ; those errors are created by my custom validation > class > and are not linked to a specific field (ie "if you check that option, > please fill > this field") > > > > The ValueBoxEditorDecorator will I think put the error on the left of the > control, but you can use CSS to display it on the right (or maybe you can > override its template). And you should be able to implement your own class > to > underline the invalid control. > > > > Hope this helps > > > Regards > > > Nicolas > -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/groups/opt_out.
