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Hi everyone,
this may be an obvious newbie question, but I have found no answer
that looks good to me. Anyway, here goes:
What is the best place to initialize a property with a default value
for a form?
I am looking at a page that makes heavy use of AJAX to re-render the
form, displaying or hiding stuff based on some property values in the
form. I also want the page to be stateless on the server side. The
form is so specialized that using BeanEditor & Co does not fit - I am
aware that those components pretty much take care of this problem for
simple forms.
That's just for background, I have the form with its logic working.
I currently initialize the property in pageAttached() because that
gets called before the form does its data binding:
public class MyPage {
@Property String p;
// lots of other properties for the form, plus
//logic for partial re-rendering
public void pageAttached() {
this.p = "default value";
}
}
Now pageAttached() is deprecated, and I understand the reasons
(abolition of the page pool). But what other place fits the bill?
onPrepare() is called before data binding, but it is called again
after data binding. So simple initialization code in onPrepare() would
overwrite the form data with the default.
onPrepareForSubmit() is not called when the page is first rendered.
onPrepareForRender() is called when the page is first rendered, but on
subsequent submits for partial re-rendering it is called after data
binding.
Using a getter method that checks for null more or less works but is
fragile with regard to null values being bound from the form (not sure
if that can actually happen, but it has a fragile and non-obvious feel
to it):
public String getP() {
if (this.p == null) {
this.p = "default value";
}
return this.p;
}
This also distributes the initialization to many methods, and I would
like it better to have it in a single method.
So - am I overlooking something?
All suggestions are much appreciated!
- - Arno
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