Hi David, My code doesn't include an editing capability so I don't have any working code that I can cut and paste. Also I have not tried sending a List back from a JSP page.
Are you getting any sub-lists back or are they all null? Cheers, Steve -----Original Message----- From: DavidCAIT [mailto:dzaze...@cait.org] Sent: 02 June 2009 14:13 To: user@struts.apache.org Subject: RE: Iterating over a List of Lists Thanks for the reply. I am able to display the contents of the nested list (as indicated in your example). However, I want to make the list contents editable and return them to the Struts action. For example, something similar to: <s:iterator value="outerList"> <tr> <s:iterator> <td><s:textfield value="%{listItem}"/></td> </s:iterator> </tr> </s:iterator> Displaying the contents of the nested list is not the problem. I'm experiencing problems indexing the textfields when returning the list to the Struts Action. Perhaps the following order of events will clarify my problem: 1. First Struts Action retrieves records from the database and populates the List<List<Objects>>. 2. JSP page correctly displays all of the List<List<Objects>>. 3. (broken step) Second Struts Action would like to receive the List<List<Objects>> and save them back to the database. The problem seems to be that my JSP page does not properly index the textfield elements. Struts is then unable to parse the results back into the List<List<Objects>> for the Second Action. So what names should I give the different textfields to allow Struts to parse them into a List<List<Objects>>? Steve H. wrote: > > This works for me > > <s:iterator value="outerList"> > <tr> > <s:iterator> > <td><s:property/></td> > </s:iterator> > </tr> > </s:iterator> > > My inner list is a list of Strings. > > This code gives me one innerList list per line > > Hope this helps, > > Steve > > -----Original Message----- > From: DavidCAIT [mailto:dzaze...@cait.org] > Sent: 02 June 2009 02:14 > To: user@struts.apache.org > Subject: Iterating over a List of Lists > > > Hello, > > I am trying to use a nested List<List<MyObject>> with a Struts 2 Action > and > a JSP page. I would like to iterate through the JSP page to display the > existing data, allow the user to edit the data, and post the form to a > second Action. However, my second Struts Action always receives back a > null > list. I think that my indexing in the JSP page is incorrect. Does anyone > have any suggestion about the correct way to index a nested list on the > JSP > page? > > This is how I am currently setting my indices: > > myList[0][0].property > myList[0][1].property > .... > myList[1][0].property > ....... > > My JSP code looks like: > > <s:iterator value="myList" status="outerStat"> > <s:iterator value="myList[#outerStat.index]" status="innerStat"> > <s:textfield > name="myList[%{#outerStat.index}][%{#innerStat.index}].property" > value="%{property}" /> > </s:iterator> > </s:iterator> > > Inside my second Struts action, I have the following code (the first > action > merely retrieves the list from the database and it works correctly since > the > JSP does populate correctly with all of the db records): > > private List<List<MyObject>> myList = new ArrayList<List<MyObject>>(); > > public List<List<MyObject>> getMyList() { return myList; } > > public void setMyList(List<List<MyObject>> numbers) { myList = numbers; } > > // this execute method is called when posting the form and always returns > null > // when the user is done updating the information > // even though the first action correctly populated the JSP page > public String execute() { > for (List<MyObject> theList : myList) { > if (theList == null) { > System.out.println("received a null list"); > } > } > } > > Thanks! > -- > View this message in context: > http://www.nabble.com/Iterating-over-a-List-of-Lists-tp23824944p23824944.htm > l > Sent from the Struts - User mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@struts.apache.org > For additional commands, e-mail: user-h...@struts.apache.org > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@struts.apache.org > For additional commands, e-mail: user-h...@struts.apache.org > > > -- View this message in context: http://www.nabble.com/Iterating-over-a-List-of-Lists-tp23824944p23832301.htm l Sent from the Struts - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org
