Hi Toscano,
I solved this by making an AJAX call in order to change the pic. I don't
know if it's possible for your app to use AJAX (and thus depend on enabled
javascript on client side) - but here's my code
final TextField t;
final NonCachingImage img;
add(img = new NonCachingImage("captchaImage",
_captchaService.getCaptchaImageForId(_challengeId)));
add(t = new TextField("captchaField", new Model()));
img.setOutputMarkupId(true);
add(new AjaxFallbackLink("changeCaptcha") {
@Override
public void onClick(AjaxRequestTarget target) {
if (target != null) {
NonCachingImage newImg = new
NonCachingImage("captchaImage",
_captchaService.changeCaptchaImageForId(_challengeId));
CaptchaPanel.this.replace(newImg);
target.addComponent(newImg,
img.getMarkupId());
}
}
});
The "CaptchaPanel" is just the Panel holding the link and the image - the
service just returns a CaptchaImageSource, nothing special about it.
But be sure to set outputmarkupId to true AND be sure to use a non-caching
image, otherwise a cached image on the client side could be used instead of
the new image.
i hope i could help you
michael
PS: looking at my code, i realised that it may be better to use AjaxLink
instead of AjaxFallbackLink as it would result in a NPE if no JS is
available :-)
Toscano wrote:
>
> Hello,
>
> I'm having problems with a Captcha image reloading method, and I'm sure it
> must be very easy to solve, but I can't!!
> I have a form with about 10 fields, and at the end one Captcha image using
> CaptchaImageResource and Image controls. Sometimes it is difficult to
> read, so I put one link with the following OnClick code:
>
> public void onClick()
> {
> imagePass=randomString(6,8);
> captchaImageResource = new CaptchaImageResource(imagePass);
> captchaImage.setImageResource(captchaImageResource);
> }
>
> I mean, I create a new captcha image correctly, but all the content of the
> fields are removed! This means that the user has to input them again. I
> think it is just a matter of the Link... if I just leave the OnClick code
> blank, it reloads the page without maintaining the values.
>
> I have a Form and a CompoundPropertyModel which works fine:
>
> // Form, pojo, and compound property model
> InitiationForm initiationForm;
> NewUser newUser;
> CompoundPropertyModel initiationFormModel;
>
> //Create CompoundPropertyModel
> initiationFormModel = new CompoundPropertyModel(newUser);
>
> // Form
> initiationForm = new InitiationForm ("initiationForm",
> initiationFormModel);
>
>
> How can I refresh the image without losing the already input values?
>
> Thank you very very much for your time!
> Oskar
>
>
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