Re: [Wicket-user] Problem with ajax tree and listView

[Isaac Weng]

Sorry, don't know why my message didn't send, probably because gmail and attachement.

I've made a quick start files for the problem. The problem is



Could you give me some directions ? Thanks.


Sincerely,
Isaac


Matej Knopp wrote:

If using a ListView to display the tree node value, after I collapse the node, I can never expand it again, and the ListItem becomes null. No problem with a Label.

hi,

this really is weird. Can you post a quick start project that
demonstrates the behavior?

-Matej

On 3/23/07, Isaac Weng <[EMAIL PROTECTED]> wrote:

Hi,
    This is my first time asking questions here.
    Hope I can make my question clear.

    I'v tried to extend the ajax tree in the wicket extension. The only
modification I made is the output value, which is a customized panel
instead of a label. Following are my html and source.

    MyTree.html :

       <span wicket:id="indent"></span><a wicket:id="link"><span
wicket:id="image"/></a>
          <a wicket:id="nodeLink"><span class="icon"
wicket:id="icon"></span><span wicket:id="myPanel" />

    To simplify the problem, I strip most markups of MyPanel.html to
what I think causing the problem.
    MyPanel.html :

       <span wicket:id="outputList"><span
wicket:id="outputName">name</span></span>

    MyPanel.java :

       public MyPanel extends Panel
       {
          public MyPanel(String id)
          {
             super(id);
             ArrayList<String> list = new ArrayList<String>();
             list.add("name1");

             add(new ListView("outputList", list)
             {
                public void populateItem(final ListItem item)
                {
                   final String name = (String) item.getModelObject();
                   item.add(new Label("outputName", name));
                }
             });
          }
       }

    The problem is while I click the junction link,
ListView.renderItem() throws a NullPointerException. After some digging,
I found that the ListItem is null. Then I use getList(), and it
successfully return the list I passed in and the values in that list are
also correct, however the ListItem is null which I don't know why.

    Thanks for reading my question. I will appreciate any suggestions.

Isaac

tree-quickstart.IamAzip
Description: Binary data

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