Netui:tree with calculated tree

Question

          Hi!
          I am fighting with the netui:tree tag in a JSP with Bea Weblogic. Showing a tree
          like
          <netui:tree tree="commodityTreeResult" action="updateTree" imageRoot='<%=
          request.getContextPath() + "/resources/images" %>'>
          <netui:node label="root" expanded="true">
          <netui:node label="root.1"></netui:node>
          <netui:node label="root.2"></netui:node>
          </netui:node>
          </netui:tree>
          works easily. But I'd like to show a tree that is calculated by a Java-Control.
          I hoped something like
          <netui-data:callControl resultId="treeResult" controlId="treeService"
          method="makeTree"></netui-data:callControl>
          <netui:tree tree="{pageContext.treeResult}" action="updateTree" imageRoot='<%=
          request.getContextPath() + "/resources/images" %>'>
          </netui:tree>
          gives an error "Cannot find tree control attribute 'commodityTreeResult',
          and something like
          <netui:tree tree="commodityTreeResult" action="updateTree" imageRoot='<%=
          request.getContextPath() + "/resources/images" %>' rootNode="{pageContext.treeResult}">
          </netui:tree>
          does not work either. How do I "plug in" a calculated tree into netui:tree?
          Thanks so much,
          Hans-Peter
          

Answer 1

Hi! Alright, I had the same problem and solved with the sample code. Put the code into your PF's begin, to initialize a TreeNode hierarchy, and store it in session.tree:
          HttpSession session = getRequest().getSession();
          TreeNode rootNode = new TreeNode(null,
          "Root", // Label
          null, // Action
          "javascript:alert('Root');",
          null, // Target
          false // Expanded
               session.setAttribute("tree", rootNode);
          for (int i=0; i < 10; i++)
          TreeNode node = new TreeNode(null,
          "Node #" + i, // Label
          null, // Action
          "javascript:alert('Node #" + i + "');",
          null, // Target
          false // Expanded
          rootNode.addChild(node);
          After that, just refer to the root node as XScript "{session.tree}":
          <netui:tree tree="{session.tree}" action="updateTree"></netui:tree>
          Dont't forget to implement updateTree - just copy and paste it from the tree sample. Good luck!