You can rerefresh the whole form :
yourForm.setOutputMarkupId(true);
...
target.addComponent(yourForm)
To highlight the error field (with a red star), I usually use a
FormComponentFeedbackIndicator like that :
RequiredTextField<String> yourTextField = new
RequiredTextField<String>("name");
yourForm.add(yourTextField);
FormComponentFeedbackIndicator yourTextFieldError = new
FormComponentFeedbackIndicator("nameError");
yourTextFieldError.setIndicatorFor(yourTextField );
yourTextFieldError.setOutputMarkupPlaceholderTag(true);
yourForm.add(nomError);
You may also use FormComponentFeedbackBorder.
Gabriel.
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