Been a while since Ive done it, but this sort of thing can be managed
using a lazy list (from commons-collections).
http://jakarta.apache.org/commons/collections/api/org/apache/commons/collections/ListUtils.html#lazyList
[http://jakarta.apache.org/commons/collections/api/org/apache/commons/collections/ListUtils.html#lazyList]
I forget the exact semantics of it but you can check the javadocs.
Some more info here:
http://wiki.apache.org/struts/StrutsCatalogLazyList
[http://wiki.apache.org/struts/StrutsCatalogLazyList]
hth
Andrew
Diego Manilla Suárez wrote:
Hi! I have a problem with form members initialization.
I have this form.
public class BasicContentForm extends ValidatorForm {
protected java.util.List propertyValues;
public BasicContentForm() {
this.propertyValues = new java.util.ArrayList();
}
public void setPropertyValues( java.util.List propertyValues ) {
this.propertyValues = propertyValues;
} public java.util.List getPropertyValues() {
return this.propertyValues;
}
public Object getPropertyValue(int index) {
return propertyValues.get(index);
}
public void reset(ActionMapping mapping, HttpServletRequest request) {
this.propertyValues = new java.util.ArrayList();
}
}
And this jsp:
<logic:iterate name="basicContentForm" property="propertyValues"
id="propertyValue">
<html:text name="propertyValue" property="value" indexed="true"/>
</logic:iterate>
The problem is that the number and type of the elements of
propertyValues list is calculated dynamically (from the database). I was
doing that on my Action class, but I've realized that this doesn't work:
when I submit the form, I get an Exception at BeanUtils.populate,
because the list is not properly initialized. If I can't initialize it
on the reset() method (I need to access the database), what else can I do?
Thanks in advance
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