Problem with repeating htmlb:tray onExpand event

Question

I have an htmlb:tray in my bsp application with an onExpand event.  I want a report generated and displayed when the tray is expanded, and this works the first time that I click on the tray icon.  However, if I am still on the same page, close the tray, and then re-open it, the tray expands with empty content.  If I set breakpoints in DO_HANDLE_EVENT, DO_INIT, and DO_REQUEST, nothing is caught.  It is as if no event is raised after the first time that the tray is opened.  If I leave the page and come back, then my process is working again.
I cannot assume that my users will only open a tray once while on a page.  Is there a trick to get the onExpand event to trigger more than once?  (I have several trays with various reports on the page, and I don't want to pre-generate all of them.)
Janice Ishee

Answer 1

Hi,
You need to use <b>onCollapse Event</b> also. I tested. Its working fine after adding the onCollapse Here is the sample code:
<b>Layout:</b>
<%@page language="abap" %>
<%@extension name="htmlb" prefix="htmlb" %>
<htmlb:content design="design2003" >
  <htmlb:page title=" " >
    <htmlb:form>
      <htmlb:tray id          = "TermReq"
                  title       = "Termination request"
                  width       = "225"
                  onExpand    = "getTermReq"
                  onCollapse  = "dummy"
                  isCollapsed = "<%= query->enab_trmreq %>" >
        <htmlb:trayBody>
          <htmlb:textView text   = "Hello World!"
                          design = "EMPHASIZED" />
          <htmlb:button text    = "Press Me"
                        onClick = "myClickHandler" />
        </htmlb:trayBody>
      </htmlb:tray>
    </htmlb:form>
  </htmlb:page>
</htmlb:content>
Event handling:
EVENT_ID1 TYPE REF TO IF_HTMLB_DATA.
EVENT_ID1 = CL_HTMLB_MANAGER=>GET_EVENT_EX( REQUEST ).
CASE EVENT_ID1->EVENT_SERVER_NAME.
  WHEN 'tray'.
  WHEN 'getTermReq'.
    QUERY->ENAB_TRMREQ = ''.
  WHEN 'dummy'.
    QUERY->ENAB_TRMREQ = 'true'.
ENDCASE.
Hope this will solve your problem.
Raja T
Message was edited by:
        Raja T