Thanks a lot for your input guys, it really helped me a lot. I chose to use
Kent's approach using a Validator that - by the way - could not be a static
class as I had to access member variables outside the Validator.
Thanks again and have a nice day
Michael
Kent Tong wrote:
>
>
> Gerolf Seitz wrote:
>>
>> ditch the form and let CaptchaPanel extend FormComponentPanel. for the
>> captcha and do a check for the form in onBeforeRender (since it's not yet
>> added to the hierarchy in the constructor).
>> just use "getForm();" to check for the existence of an ancestor form.
>> this
>> method throws an exception if no form was found.
>>
>
> I'd suggest that it extend Panel, not FormComponentPanel as there is no
> composite data structure here. The best place to validate the input is
> in a custom validator. Here is some sample code (there is also step-by-
> step instruction on validation in my tutorials; see my signature):
>
> public class CaptchaPanel extends Panel {
> private static class CaptchaValidator extends AbstractValidator {
> protected void onValidate(IValidatable validatable) {
> String value = (String) validatable.getValue();
> if (value matches the image) {
> return;
> }
> error(validatable);
> }
> }
> public CaptchaPanel(String id) {
> super(id);
> RequiredTextField t = new RequiredTextField("captchaInput", new
> Model());
> t.add(new CaptchaValidator());
> add(t);
> add(new Image("captchaImage", ...));
> }
> }
>
>
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