Of course, I immediately found an example for handling dynamic nesting as soon as I posted that I hadn't. Figures. There are some example projects that use the <nested> custom tags in the resource section of the Jakarta Struts site. One of them uses a relatively simple trick (once you have seen it, it seems simple :-)) with dynamic inclusion of a JSP to handle node data. You will find it on this page:
http://jakarta.apache.org/struts/resources/examples.html It is the one called "Tree (dynamic nested fun)". Duh. - Mike Van Riper mailto:[EMAIL PROTECTED] > -----Original Message----- > From: Van Riper, Mike > Sent: Wednesday, September 04, 2002 3:21 PM > To: Struts Users Mailing List > Subject: RE: iterate question > > > I have a similar need to the one expressed by Kirby. I have > not used the nested extension, but, I have read through the > online primer. I saw nothing there that would indicate it > would handle *dynamic* tree structures. Yes, you can use the > nesting custom tags to any depth you want. Yes, you don't > need to know in advance how many items there are in a > collection at a particular level. However, it looks like you > need to know in advance what depth to go to. When the tree is > being generated dynamically and the depth can not be known in > advance, I don't see how to use the nesting extension to handle it. > > I hope that I am wrong about that because I'd love to just > use the nesting extension rather than write something on my > own. If the nesting extension can handle this situation, > please point me to the right part of the docs or an existing > example that will help me figure that out. > > Assuming I am right and the nesting extension doesn't handle > what I need yet, my sense is there might be a way to enhance > the nesting extension to handle this for recursive > structures. For example, consider a Node object that had some > instance data and a collection of child Node objects and a > getChildNodes() method. What if <nested:iterate> took an > additional parameter which was recurseProperty="childNodes"? > It should be possible to implement tail recursion in the > implementation of <nested:iterate> that would repeat the > execution of the body of the <nested:iterate> tag with the > new collection being the one returned from the > getChildNodes() call on the current node. This would do a > depth first recursion of nodes outputting the same > information for each node. Assuming there is a way to get > depth information, I could use that information in the body > of my <nested:iterate> and dynamically reflect that in the > formatting of the nodes for display too. > > Of course, it is not that simple. There would be intermediate > state to maintain and correctly return to and continue on > from for each time a recursion to another level happened. The > nesting extension does quite a bit already and this may not > be the best way to solve my recursive structure handling > problem. Then again, maybe it would make sense. I thought it > was at least worth sharing the idea. > > - Mike Van Riper > mailto:[EMAIL PROTECTED] > > > -----Original Message----- > > From: Sri Sankaran [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, September 04, 2002 11:29 AM > > To: Struts Users Mailing List > > Subject: RE: iterate question > > > > > > Look at the nested extension @ > > http://www.keyboardmonkey.com/next/index.jsp. It is exactly > > for this purpose. > > > > It is included as part of Struts 1.1.x > > > > Sri > > > > > -----Original Message----- > > > From: Kirby Vandivort [mailto:[EMAIL PROTECTED]] > > > Sent: Wednesday, September 04, 2002 12:13 PM > > > To: [EMAIL PROTECTED] > > > Subject: iterate question > > > > > > > > > Hello, > > > > > > I'm new to struts, so please bear with me. I'm in the early > > > stages of converting something to the struts framework and > > > I've run into a situation that I'm not sure how to handle. > > > > > > I want to make a page that, as an example, looks like: > > > > > > - message 1 > > > - message 2 > > > * re: message 2 > > > + re: re: message 2 > > > * re: message 2 > > > * re: message 2 > > > - message 3 > > > > > > > > > etc. So, I'm going to pass a collection to the jsp page, and > > > the collection might contain collections. There can be any > > > level of nesting. > > > > > > This seems like a common case, but I haven't found a way to > > > do it using the struts tags as of yet. It really needs some > > > sort of recursive solution since you don't know how many > > > levels you will need to go down, and the presentation is > > > something that clearly shouldn't be done on the business > > > side, so any help or guidance that you have would be appreciated. > > > > > > Thanks! > > > > > > -- > > > > > > Kirby Vandivort Theoretical Biophysics Group > > > Email: [EMAIL PROTECTED] 3051 Beckman Institute > > > http://www.ks.uiuc.edu/~kvandivo/ University of Illinois > > > Phone: (217) 244-5711 405 N. Mathews Ave > > > Fax : (217) 244-6078 Urbana, IL 61801, USA > > > > > > -- > > > To unsubscribe, e-mail: > > > <mailto:struts-user-> [EMAIL PROTECTED]> > > > For > > > additional commands, > > > e-mail: <mailto:[EMAIL PROTECTED]> > > > > > > > > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
