I gave up my tree barking with that last approach and simply defined a
index int with get and sets in my NestedDispatchAction class.
Now when i submit my indexed button
<html:submit property="method" indexed="true">
..
But getMethodName called in my execute method returns null.
null[index]
On 27 Jun 2004, at 17:05, Mark Lowe wrote:
I've got a strange problem where I've extended LookupDispatchAction
with my own version and then in turn extended that to create
NestedDispatchAction
for one reason or another the getClass method DispatchAction throws a
NoSuchMethodException even though its there and works quite happily
when not running in my extends LookupDispatchAction.
I've over ridden the execute method i check if the parameter specified
in struts xml has a index.
String methodName = getMethodName(mapping, form, request, response,
parameter);
int index = 0;
while(enu.hasMoreElements()) {
String target = (String) enu.nextElement();
if(target.indexOf(parameter) != -1 && !target.equals(parameter)) {
int start = target.indexOf("[") + 1;
int end = target.indexOf("]");
index = Integer.parseInt( target.substring(start,end) );
}
}
and then forward to my
return
nestedDispatchMethod(mapping,form,request,response,methodName,index);
..
The idea being to just pass the index through in the dispatched
methods and thus providing me with a hook to know which nested objects
to operate on.
The principle is simple, but this mysterious exception suggests
there's something on quite as simple as i perhaps first imagined.
Ideas?
On 27 Jun 2004, at 13:15, Mark Lowe wrote:
The only means i've thought this could be possible would be to
iterate through the parameter names enumeration like this..
Enumeration parameterNames = request.getParameterNames();
String parameter = mapping.getParameter();
while(parameterNames.hasMoreElements()) {
String paramName = parameterNames.nextElement();
if(paramName.indexOf(parameter) != -1) {
// find the index using substring
nestedDispatchMethod([struts gubbins],parameter, index);
}
}
But given such forms are likely to have a lot of parameter names this
would seem a bit heavy going.
On 27 Jun 2004, at 12:42, Mark Lowe wrote:
I've been looking through the struts source with a view to trying to
find a way of handling nested dispatch actions.
Basically the problem is passing through an index or key to the
getMethodName (MappedDispatchAction) or the getKeyMethodMap
(LookupDispatchAction) and running a method based on that.
<html:form action="/foo.do">
<c:forEach var="course" items="${menuForm.courses}"
varStatus="firstIndex">
<c:forEach var="nestedLevel" items="${course.dishes}"
varStatus="nestedIndex">
<html:text property="${courses[firstIndex.index].
dishes[nestedIndex.index]" />
<html:submit property="method" indexed="true">
..
The situation is that i need to add an item to the the levelOne
object. But when submitting there's no way of grabbing the index and
thus knowing which of the levelOne objects to add a new rows of
nested object to.
So far I've been using the unspecified method and searching the
parameter names for a custom button name. So not really dispatching
any thing. But If i wanted to go another level i would arrive at the
same problem.
So far it looks like adding a nestedDispatchMethod or
indexedDispatchMethod which also passes the index through.
Anyone else looked into this? It would seem a common enough problem.
Mark
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