4 Replies Latest reply on Mar 12, 2008 7:55 PM by Alan Feng

    problem determine component id to attach effect to

    Alan Feng Novice


      I noticed that the actual ID assigned to a component usually is not the same as what I specified. For example, if I have a form with id "form1" and a component inside the form with id "field1", the final id for the component is automatically changed to "form1:field1". Why does it behave this way?

      The problem is, sometimes, the prefix is not as predictable as above example. I have a field that got a id like "j_id39:j_id40:0:field1" and I have no idea where the j_id40 part comes from. Therefore, I can't predict its final id value and can't refer to it reliably in order to apply effect.


        • 1. Re: problem determine component id to attach effect to
          Pierre Masse Newbie

           

          "alllle" wrote:

          I noticed that the actual ID assigned to a component usually is not the same as what I specified. For example, if I have a form with id "form1" and a component inside the form with id "field1", the final id for the component is automatically changed to "form1:field1". Why does it behave this way?

          The problem is, sometimes, the prefix is not as predictable as above example. I have a field that got a id like "j_id39:j_id40:0:field1" and I have no idea where the j_id40 part comes from. Therefore, I can't predict its final id value and can't refer to it reliably in order to apply effect.




          That's the way JSF works. If you do not put an id on a control yourself, JSF will. If you have a control in a control, like a field on a form, JSF will id the field as "form:field". As for finding out what the final id is, looks like richFaces will figure it out by itself.

          Just use "field1" and richFaces will add "j_id39:j_id40:0:" automatically.
          I never tried this in a dataTable but, I know that's what happens with a straight field on a page.

          Hope this help.

          P.S.: Look at your html source. It will help you figure out what richFaces generates for you.





          • 2. Re: problem determine component id to attach effect to
            Alan Feng Novice

            Thank you for the explanation. It seems that even if I don't need to worry about the dynamic prefix part of the ID, I am still facing a very specific problem:

            I am using a facelet <ui:repeat varStatus="varStatus" ...> tag to iterate through several items. For each item I create a <rich:panel id=...> to display the item properties. I then need to refer to one of the items to display a richfaces effect, such like a highlight.

            The problem is that since it is in a loop, I can't get the ID of the <rich:panel> to be dynamic. I used id="item_#{varStatus.index}", I also tried id="item_#{item。id}", both of them end up showing as "item_". In other words, I can't seem to be able to mix in a dynamic index or id into the "id" attribute of the <rich:panel>.

            Because of this problem, I can refer to the control to display the effect.

            Do you have any idea how to solve this?

            Thanks for the help!

            • 3. Re: problem determine component id to attach effect to
              Pierre Masse Newbie

              Hmmmm...

              We do not use Facelets. Would Facelets's "jsfc" feature help?
              Would this work :

              <ui:repeat varStatus="varStatus" jsfc="h:panelGrid">

              Cheers

              • 4. Re: problem determine component id to attach effect to
                Alan Feng Novice

                That wouldn't apply to this case.

                However, I did discover that, it is not the Facelet causing the problem. It's the <rich:panel> tag not resolving the variables properly. I add a regular block in the Facelet <ui:repeat> and it was getting the dynamic ID properly, while the <rich:panel> in the same loop does not resolving the dynamic ID.

                It seem like a bug in the RichFaces library. I'll do a search in the bug db and probably file a new bug report.

                Another thing I discovered is that although the "varStatus" is a valid tag attribute of the Facelet <ui:repeat> tag, it is not implemented in the code and there is feature request already created for it.

                Thanks for the help!