Thanks for your answers, I finally found the "best practice" solution to my
problem, well, I think so. Remember I was looking for a way to "switch" on/off
a part of my page (that of course includes declared components in page class
and in html markup).
I'll try to explain why some approaches aren't the best, imho.
Wanting to "disable" certain components, I think it's quite a repetitive task
to set empty strings to each and every component I want to hide. Here we only
have one, but imagine having ten or twelve...
>
> if (product.getPhoto() != null) {
> add(new Label("product-photo-date", someDateModel));
> } else {
> add(new Label("product-photo-date", ""));
> }
>
The same for this, I have to manually override each and every component:
> newLabel("product-photo-date",
> CommonUtil.getFormattedDate(product.getPhoto().getDateTime())) {
> public boolean isVisible() {
> return product.getPhoto() != null;
> }
> }
>
I couldn't get ideas in
http://cwiki.apache.org/WICKET/create-dynamic-markup-hierarchies-using-panels.html
to work.
Wicket complained anyway.
Well... I just came by Fragments... the magical word... that solved my issue:
Fragment photoFragment = new Fragment("photo-panel", "photo-fragment");
if (product.getPhoto() != null) {
photoFragment.add(new Label("product-photo-date", someDateModel));
add(photoFragment);
} else {
add(new Label("photo-panel")).setEnabled(false);
}
So like this we're choosing in Java whether to include a fragment (and its
childs) or not.
<span wicket:id="photo-panel">[photo-panel]</span>
<wicket:fragment wicket:id="photo-fragment">
<span
wicket:id="product-photo-date">[product-photo-date]</span>
</wicket:fragment>
And that's all to it.
Regards,
Francisco
PS:
> add(new Label("product-photo-time", new PropertyModel(product, "
> photo.dateTime")));
Yeah, but I needed to handle the Date outputting it formatted with a
SimpleDateFormat. That's why I have
CommonUtil.getFormattedDate(product.getPhoto().getDateTime()).
> But doesn't the product description of dates change after creation of that
> label?
> and also should product be kept into memory?
No, it's just the original photo date coming from exif data, and it
needn't be altered. Thanks for the info cause I'm planning to use it
elsewhere.
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