RE: Indexed Properties and Population
Here's how I did it:
On my Form:
public ArrayList getKids() {
returns kids;
}
public void setKids(ArrayList kids) {
this.kids = kids;
}
public int getKidsSize() {
return kids.size();
}
In my JSP:
...
...
On my form (relevant for saving)
public void reset(ActionMapping mapping, HttpServletRequest request) {
// make the kids ArrayList the proper size and populate with
// empty objects
int kidsSize = Integer.parseInt(request.getParameter("kidsSize"));
kids = new ArrayList(kidsSize);
for (int i=0; i < kidsSize; i++) {
kids.add(new KidForm());
}
}
This seems to work great for me. Any other suggestions/methods are
encouraged ;) Is it lunchtime (beertime) yet?
HTH,
Matt
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Friday, January 17, 2003 6:52 AM
To: Struts Users Mailing List
Subject: Re: Indexed Properties and Population
David says:
"One implementation that should work based on your example
as long as you are willing to create a child factory is in the commons
collection package and is ListUtils.lazyList, which takes a List and
factory."
I have used this as well, in combination with the nested tag library.
We have a page that displays and updates a List of Value Objects where
each have two internal Lists of Value Objects.
The structure of value objects are sent to me from the back end as such:
CustomerList
CustomerVo 1
creditVo1 invoiceVo1
creditVo2 invoiceVo2
. .
CustomerVo2
creditVo1 invoiceVo1
creditVo2 invoiceVo2
. .
I would be curious to know this would done without the nested tags and
lazy list.
"David Morris" <[EMAIL PROTECTED]> on 01/16/2003 03:50:10 PM
Please respond to "Struts Users Mailing List"
<[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
cc:
Subject:Re: Indexed Properties and Population
Matt,
You really don't need to know how many there are, just create them
on demand. You can intercept gets and auto-extend the underlying
Collection. One implementation that should work based on your example
as long as you are willing to create a child factory is in the commons
collection package and is ListUtils.lazyList, which takes a List and
factory.
David Morris
>>> [EMAIL PROTECTED] 01/16/03 02:31PM >>>
I have an ArrayList on a form... let's call the form Parent and the
ArrayList Children.
If I have:
private ArrayList children;
public void setChildren(int index, ChildForm childForm) {
this.children.set(index, childForm);
}
Then saving my form results in a NPE for BeanUtils.copyProperties. If
I
create a whole bunch of objects in the ArrayList in the constructor -
I
avoid this problem:
public ParentForm () {
children = new ArrayList(100);
for (int i=0; i < 100; i++) {
children.add(new ChildForm());
}
But I'm guessing that this fits better into the reset(mapping,
request)
method of my form. My question is - how do I determine how many there
are?
Is there something in the request this this information - or should I
set a
hidden field with the number of children?
Thanks,
Matt
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Re: Indexed Properties and Population
David says:
"One implementation that should work based on your example
as long as you are willing to create a child factory is in the commons
collection package and is ListUtils.lazyList, which takes a List and
factory."
I have used this as well, in combination with the nested tag library.
We have a page that displays and updates a List of Value Objects where
each have two internal Lists of Value Objects.
The structure of value objects are sent to me from the back end as such:
CustomerList
CustomerVo 1
creditVo1 invoiceVo1
creditVo2 invoiceVo2
. .
CustomerVo2
creditVo1 invoiceVo1
creditVo2 invoiceVo2
. .
I would be curious to know this would done without the nested tags and
lazy list.
"David Morris" <[EMAIL PROTECTED]> on 01/16/2003 03:50:10 PM
Please respond to "Struts Users Mailing List"
<[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
cc:
Subject:Re: Indexed Properties and Population
Matt,
You really don't need to know how many there are, just create them
on demand. You can intercept gets and auto-extend the underlying
Collection. One implementation that should work based on your example
as long as you are willing to create a child factory is in the commons
collection package and is ListUtils.lazyList, which takes a List and
factory.
David Morris
>>> [EMAIL PROTECTED] 01/16/03 02:31PM >>>
I have an ArrayList on a form... let's call the form Parent and the
ArrayList Children.
If I have:
private ArrayList children;
public void setChildren(int index, ChildForm childForm) {
this.children.set(index, childForm);
}
Then saving my form results in a NPE for BeanUtils.copyProperties. If
I
create a whole bunch of objects in the ArrayList in the constructor -
I
avoid this problem:
public ParentForm () {
children = new ArrayList(100);
for (int i=0; i < 100; i++) {
children.add(new ChildForm());
}
But I'm guessing that this fits better into the reset(mapping,
request)
method of my form. My question is - how do I determine how many there
are?
Is there something in the request this this information - or should I
set a
hidden field with the number of children?
Thanks,
Matt
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RE: Indexed Properties and Population
I think what I'll do is to create a new method called getChildrenSize() that
does what Mark suggests below - then I'll put this as a hidden field on my
form. Since all my form's contents are dumped into a JSP (and gone), I've
lost the size of the children - unless I save it as a hidden field, or count
them in my tag. So then in my reset method on the form, I
can create x number of children and do set(index, form).
Thanks,
Matt
-Original Message-
From: Mark Galbreath [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 16, 2003 2:57 PM
To: 'Struts Users Mailing List'
Subject: RE: Indexed Properties and Population
int elements = children.size()
?
Where are you defining this method?
-Original Message-
From: Raible, Matt [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 16, 2003 4:31 PM
If I have:
private ArrayList children;
public void setChildren(int index, ChildForm childForm) {
this.children.set(index, childForm);
}
My question is - how do I determine how many there are? Is there something
in the request this this information - or should I set a hidden field with
the number of children?
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<mailto:[EMAIL PROTECTED]>
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<mailto:[EMAIL PROTECTED]>
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Re: Indexed Properties and Population
Just make sure you've got a way to cap the max number you auto-create...
Quoting David Morris <[EMAIL PROTECTED]>:
> Matt,
>
> You really don't need to know how many there are, just create them
> on demand. You can intercept gets and auto-extend the underlying
> Collection. One implementation that should work based on your example
> as long as you are willing to create a child factory is in the commons
>
> collection package and is ListUtils.lazyList, which takes a List and
> factory.
>
> David Morris
>
> >>> [EMAIL PROTECTED] 01/16/03 02:31PM >>>
> I have an ArrayList on a form... let's call the form Parent and the
> ArrayList Children.
>
> If I have:
>
> private ArrayList children;
>
> public void setChildren(int index, ChildForm childForm) {
> this.children.set(index, childForm);
> }
>
> Then saving my form results in a NPE for BeanUtils.copyProperties. If
> I
> create a whole bunch of objects in the ArrayList in the constructor -
> I
> avoid this problem:
>
> public ParentForm () {
> children = new ArrayList(100);
> for (int i=0; i < 100; i++) {
> children.add(new ChildForm());
> }
>
> But I'm guessing that this fits better into the reset(mapping,
> request)
> method of my form. My question is - how do I determine how many there
> are?
> Is there something in the request this this information - or should I
> set a
> hidden field with the number of children?
>
> Thanks,
>
> Matt
>
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> To unsubscribe, e-mail:
>
> For additional commands, e-mail:
>
>
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D.O.Tech
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RE: Indexed Properties and Population
int elements = children.size()
?
Where are you defining this method?
-Original Message-
From: Raible, Matt [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 16, 2003 4:31 PM
If I have:
private ArrayList children;
public void setChildren(int index, ChildForm childForm) {
this.children.set(index, childForm);
}
My question is - how do I determine how many there are? Is there something
in the request this this information - or should I set a hidden field with
the number of children?
--
To unsubscribe, e-mail:
For additional commands, e-mail:
Re: Indexed Properties and Population
Matt,
You really don't need to know how many there are, just create them
on demand. You can intercept gets and auto-extend the underlying
Collection. One implementation that should work based on your example
as long as you are willing to create a child factory is in the commons
collection package and is ListUtils.lazyList, which takes a List and
factory.
David Morris
>>> [EMAIL PROTECTED] 01/16/03 02:31PM >>>
I have an ArrayList on a form... let's call the form Parent and the
ArrayList Children.
If I have:
private ArrayList children;
public void setChildren(int index, ChildForm childForm) {
this.children.set(index, childForm);
}
Then saving my form results in a NPE for BeanUtils.copyProperties. If
I
create a whole bunch of objects in the ArrayList in the constructor -
I
avoid this problem:
public ParentForm () {
children = new ArrayList(100);
for (int i=0; i < 100; i++) {
children.add(new ChildForm());
}
But I'm guessing that this fits better into the reset(mapping,
request)
method of my form. My question is - how do I determine how many there
are?
Is there something in the request this this information - or should I
set a
hidden field with the number of children?
Thanks,
Matt
--
To unsubscribe, e-mail:
For additional commands, e-mail:
Indexed Properties and Population
I have an ArrayList on a form... let's call the form Parent and the
ArrayList Children.
If I have:
private ArrayList children;
public void setChildren(int index, ChildForm childForm) {
this.children.set(index, childForm);
}
Then saving my form results in a NPE for BeanUtils.copyProperties. If I
create a whole bunch of objects in the ArrayList in the constructor - I
avoid this problem:
public ParentForm () {
children = new ArrayList(100);
for (int i=0; i < 100; i++) {
children.add(new ChildForm());
}
But I'm guessing that this fits better into the reset(mapping, request)
method of my form. My question is - how do I determine how many there are?
Is there something in the request this this information - or should I set a
hidden field with the number of children?
Thanks,
Matt
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