Using a treemap for lookup in a jsp grid

Question

Hi
          I am trying to use a treemap to lookup the names for id´s in a table.
          for example.
          Lookup table:
          ID.....Name
          1......carrot
          2......bananna
          the main table looks like this:
          row....id
          1.......2
          2.......1
          3.......1
          4.......2
          in my jsp page I want it to look like this:
          row....id
          1......bananna
          2......carrot
          3......carrot
          4......bananna
          I have the lookup table loaded into a treemap in the begin part of my pageflow.
          is there a special way that I can refer to the treemap in a grid view, for example, with a netui-data:expressionColumn ?
          thanks for any help.
          /Nigel
          Message was edited by NigelGuest at Feb 3, 2005 2:34 AM

Answer 1

hi,
          important here to aknowledge that the {} databinding are compile time. This implies a whole lot of restrictions. The scenario below works for me:
          - getLookupMap in the pageflow returns the lookup map
          - getList in the pageflow returns the list
          The following code then works for me
          <!-- in the heading of my JSP -->
          // get the lookup map into pagecontext
          <netui-data:getData resultId="lookup"
          value="{pageFlow.lookupMap}"/>
          // pull down as a new page attribute
          <%
          Map lookup = (Map)pageContext.getAttribute("lookup");
          %>
          Now, in my repeater ( of gridview ) I implement the column showing the actual mapped value like this:
          // to get the item key
          <netui-data:getData resultId="key"
          value="{container.item}"/>
          // to set the mapped attribute value
          <%
          pageContext.setAttribute(
          "lookupValue",
          lookup.get(pageContext.getAttribute("key")));
          %>
          // to render the mapped attribute value
          <netui:label value="{pageContext.lookupValue}"
          defaultValue=" " />
          Probably not exactly what you asked for, but hopefully close enough to guide you in the right direction.
          - Anders M.