Wow! OK, now I get it. Yes, I'm using T3.x. I never thought about that use for the index parameter, I had used only to display the current row's number. Your solution is very attractive because it will be trivial to add new columns to the table in case I need to, which was a major problem with the solution I was devising. It was only a matter of thinking about OGNL expressions in a different way than I always use them.
Thanks a lot, Mark. Regards, Dario On 2/21/07, Mark Stang <[EMAIL PROTECTED]> wrote:
Dario, The Foreach component T3.x, which I presume you are using (If you are not,check the components for your version), contains a parameter named "index". index int out no Used to store the index of the current value within the stream of elements provided by the source parameter. The index parameter is explicitly updated before the value parameter. If you set it: index="ognl:currentIndex" Then as Tapestry iterates over the list that was passed to the "Foreach" it will call "setCurrentIndex" with the current index. This happens at the top of the loop. So, in the body of the Foreach for a particular <td> you can call getList1(). Since you are not passing in a value/parameter to getList1(), how does it know what item in the list to return? Inside the method, you use "currentIndex" to pick the item in the list to return. Basically, the Foreach knows what iteration it is on. You can have it pass that value back to your Java Class with a setter. Whenever you call any of the getList methods, they use the value passed in by the Foreach. HTH, Mark Mark J. Stang Senior Engineer/Architect office: +1 303.468.2900 mobile: +1 303.507.2833 Ping Identity -----Original Message----- From: Darío Vasconcelos [mailto:[EMAIL PROTECTED] Sent: Wed 2/21/2007 3:06 PM To: Tapestry users Subject: Re: Foreach, iterate over several collections at once Sorry Mark, I didn't quite understand what you're saying, although it sounds very interesting. I can't imagine how I could make Foreach update the current value for each list, using only one Foreach. Or could I use nested Foreachs? If you would be so kind as to give me a small example, I would be very grateful... Dario. On 2/21/07, Mark Stang <[EMAIL PROTECTED]> wrote: > Hi, > The Foreach can call your class with the "current" index and set it. The "getters" use that value to return the "current" value for each list. > > HTH, > > Mark > > Mark J. Stang > Senior Engineer/Architect > office: +1 303.468.2900 > mobile: +1 303.507.2833 > Ping Identity > > > > -----Original Message----- > From: Darío Vasconcelos [mailto:[EMAIL PROTECTED] > Sent: Wed 2/21/2007 2:43 PM > To: Tapestry users > Subject: Foreach, iterate over several collections at once > > Hi, > > I'm trying to solve a problem that might be trivial in JSP, but I > can't find a way to do it in Tapestry without some collection munching > in Java. > > My problem is that I have three ArrayLists that hold very similar > information, and need to be displayed inside the same table. To > explain this better, let me draw a simple diagram: > > HeaderRow1 list1 list2 list3 > HeaderRow2 list2 list2 list3 > HeaderRow3 list3 list2 list3 > > That is, List1 contains a HashMap with two elements: HeaderRow1 and > the value for List1. List2 contains also a HashMap with twoelements, > HeaderRow1 and list2. The same applies to List3. > > I'm thinking on using a Foreach for this, but it will only iterate > over one of the lists, and I **really** need this data to be in the > same table. Of course, more than just one column per list needs to be > displayed, my example is a simplification. > > The obvious solution is to create a getJoinedTable() method and join > the three collections into one big ArrayList, but the code isn't nice, > and since I need to do this for several other pages, the picture is > not very nice. > > What puzzles me is that the solution to this problem in JSP would be > soooo simple!! There has to be a "Tapestried" way to do it... > > Regards, > > Dario > > > -- > A zygote is a gamete's way of producing more gametes. This may be the > purpose of the universe. > - Robert A. Heinlein > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- A zygote is a gamete's way of producing more gametes. This may be the purpose of the universe. - Robert A. Heinlein --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
-- A zygote is a gamete's way of producing more gametes. This may be the purpose of the universe. - Robert A. Heinlein --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
