RE : RE : [Springframework-developer] RE: [Springframework] Request Binding

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In my case, there is no add or delete, only selection in well known
number of elements (used for instantiation of the array). I didn't try
with a list but the conversion is perhaps made internally. At least with
arrays, the two minor changes I proposed work as I use them. If lists
work also it will no care about the number of elements.

Jean-Pierre

-----Message d'origine-----
De=A0: spr...@li...
[mailto:spr...@li...] De la
part de JP Pawlak
Envoy=E9=A0: lundi 7 juillet 2003 21:55
=C0=A0: 'j=FCrgen h=F6ller [werk3AT]'; 'Rhandy Lado'
Cc=A0: spr...@li...
Objet=A0: RE : [Springframework-developer] RE: [Springframework] Request
Binding

Hi Juergen,

I'm not sure that my answer is related to this, maybe.
I had to handle with multiselect listboxes. The issue is the same with
checkboxes. The form returns many values for the same identifier. I just
take a look at the code. It is already the same as in the original
framework and don't handle this situation.

I had modified in my own i21 version the
com.interface21.web.util.WebUtils class the method
getParametersStartingWith(ServletRequest as follows:
----------------------
public static Properties getParametersStartingWith(ServletRequest
request, String base) {
        Enumeration enum =3D request.getParameterNames();
        Properties props =3D new Properties();
	=09
		if (base =3D=3D null)
			base =3D "";
        while (enum !=3D null && enum.hasMoreElements()) {
            String paramName =3D (String) enum.nextElement();
			if (base =3D=3D null || "".equals(base) ||
paramName.startsWith(base)) {
                String val =3D request.getParameter(paramName);
// JPP My add
                if (request.getParameterValues(paramName).length > 1) {
                	val =3D
StringUtils.arrayToDelimitedString(request.getParameterValues(paramName)
, ","); =09
                }
 // JPP End My add
				String unprefixed =3D
paramName.substring(base.length());
				props.setProperty(unprefixed, val);
			}
        }
        return props;
    }   // getParameterValuesStartingWith
--------------

By the way, I checked what others change I made and discover also I
added in com.interface21.beans.propertyeditors.
StringArrayPropertyEditor the getAsText method:

	public String getAsText() {
		String[] array =3D (String[])this.getValue();
		return StringUtils.arrayToDelimitedString(array,",");
	}

Even if it's not related with Rhandy's question, can I or you integrate
these changes?

Regards,
Jean-Pierre=20

-----Message d'origine-----
De=A0: spr...@li...
[mailto:spr...@li...] De la
part de j=FCrgen h=F6ller [werk3AT]
Envoy=E9=A0: lundi 7 juillet 2003 19:26
=C0=A0: Rhandy Lado
Cc=A0: spr...@li...
Objet=A0: [Springframework-developer] RE: [Springframework] Request
Binding

Hi Rhandy,

For multiple form objects, you could use custom objects that you bind
parameters onto via BindUtils and put in the session as some custom
attribute. I consider it preferable to use a different strategy though:
Not a map, but a custom root object that contains the form objects as
bean properties, like a MyRootObject class with getMyFirstObject and
getMySecondFormObject methods. It's easy to bind to the contained
objects via nested properties, e.g. "myFirstFormObject.myProperty" and
"mySecondFormObject.myOtherProperty".

Regarding a list of objects, it's probably indeed the best way to parse
respective request parameters manually, in a custom onBindAndValidate
implementation. Especially if you want to add and remove elements, I
can't think of a different way. We could try to bind to an existing list
of objects, but it's not too obvious how to go about this (via an index?
what if it's a Set, Collection, or Map), so we don't support this yet.
If you have an idea how to achieve this, please let me know :-)

Regards,
Juergen

-----Original Message-----
From: Rhandy Lado [mailto:rh...@do...]
Sent: Monday, July 07, 2003 10:49 AM
To: j=FCrgen h=F6ller [werk3AT]
Subject: [Springframework] Request Binding

Hi Jurgen,

I've been using the FormController classes in a few webpages now and
found that I sometimes need to work with more than one form object. How
do I return more than two objects and bind each of them in the webpage?
Should I put each object in a Map and then return the map? If so, how do
you access the map using the <i21:bind> tags?

Also, I have a list defined in my form object. Do the <i21:bind> tags
support binding data to a list? If not, do you have any suggestions on
how I may go about this? (I was initially thinking of passing back a
series of request parameters and manually adding these values to the
form object list but I have a feeling there is a more elegant way of
doing this.)

Thanks in advance,
Rhandy

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