Before I even start on my questions, lets describe a little bit about what i'm
doing.
Basically my model has a Region and a School. A School _must_ belong to one
(and only one) Region. What I am trying to do is create a RegionPickList. So
that on the School form, you can click a link/image, have a window pop up,
select/search/etc a Region, Click ok and have the correct information
populated on the School form. I want to do this on many entities, against
many entities e.g. a Region has parent Region ( in fact I want to do something
similar with "multi-valued" associations ).
Now what this looks like at the moment on the form is pretty much
<li>
<appfuse:label styleClass="desc" key="school.region"/>
<form:errors path="region" cssClass="fieldError"/>
<input type="hidden" id="regionId" name="regionId"
value="${school.region.id}">
<input type="text" id="regionName" class="text medium"
disabled="disabled" value="${school.region.name}">
<a
href="/regionsPickList.html?valueField=regionId&displayField=regionName"
target="_blank">Pick</a>
</li>
ugly, but it works so far.
Now, in the controller
String regionId = request.getParameter("regionId");
if (regionId != null) {
try {
long id = Long.parseLong(regionId);
Region r = regionManager.get(id);
if (r == null) {
// really should be returning a error here.
return new ModelAndView();
}
catch (Exception e) {
//and here
}
} else { /* and here */ }
Now what I really want to do ( and hopefully this is obvious by now ) is
return validation errors.
So far I believe there are actually 2 ways I might possibly do this. One is
call errors.rejectValues which I have played with and failed, the other is to
override initBinder and register a binder.
In this case, which would be better to do?
In the first case I have been trying to do
errors.rejectValue("region", getText("errors.required", "school.region",
request.getLocale()));
return new ModelAndView().addObject(school);
but this never seems to actually work. Any ideas?
Also it would be nice if I could add the required part of the validation to
validation.xml. Is that possible? Im not really sure when (or what) the
validation is run against yet.
Does anyone have a nice overall solution to a issue like this.
Thanks, I look forward to your thoughts and ideas.
Alistair.
ps. Thanks to Matt Raible and everyone else who has created AppFuse. very
cool, very well done.
pss. This is my first semi-serious attempt to learn Servlets/Jsp/Java/Spring
MVC/etc/etc. Please keep that in mind.
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