Question regarding formbeans

[Vinicius Carvalho <vi...@auge.com.br>]

Hi there!
I have the following problem:
My form offers the ability to a user select from some categories, let's 
say first grade, second grade
on the next step user selects subjects for each one:

first grade:
 Math    English    Science

second grade:
Math    English     History


As you can see, a subject can participate on more than one grade. Those 
values are retreived and then the form must be
dynamic created. Now that's my question? What can I do about it? Is it 
possible to create an array of those dtos? I'm kinda lost with this issue.

There's another one similar to that, refering to textareas, I must 
create n textAreas for the user, depending on how many I've got on my 
database (it's like a metadata)

Any ideas please?

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Re: Question regarding formbeans

[dmu2201 <dm...@mail.ikasths.dk>]

Vinicius Carvalho wrote:

> Hi there!
> I have the following problem:
> My form offers the ability to a user select from some categories, 
> let's say first grade, second grade
> on the next step user selects subjects for each one:
>
> first grade:
> Math    English    Science
>
> second grade:
> Math    English     History
>
>
> As you can see, a subject can participate on more than one grade. 
> Those values are retreived and then the form must be
> dynamic created. Now that's my question? What can I do about it? Is it 
> possible to create an array of those dtos? I'm kinda lost with this 
> issue.
>
> There's another one similar to that, refering to textareas, I must 
> create n textAreas for the user, depending on how many I've got on my 
> database (it's like a metadata)
>
> Any ideas please?
>

If I understand you correctly I have had the same problem here, trying 
to dynamically use nested properties in a JSP page using Struts.

The way that I solved it was using EL combined with <iterate> tags with 
an index, a little like this:
If you have the grades in one array, called grades, stored in session 
scope, and the underlying properties, the subjects, contained as 
properties in those grades objects I would do this:
<logic:iterate name="grades" scope="session" indexId="gradeId">
  <logic:iterate name="grades[${gradeId}].subjects}" scope="session" 
index="subject" indexId="subjectId">
      <bean write name="subject" property="title" />
  </logic:iterate>
</logic:iterate>

Here I assume that you have a little like these objects:
grade:
   private Subject[] subjects;
public Subject[] getSubjects();

subject:
   private String title;
   public String getTitle();

Hope that helps a little...

Claus

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