javascript - Novice Menu/SubMenu issue -

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i still new asp.net web programming can me out. have horizontal mainmenu , horizontal submenu directly under it.

i loading these database menucollection session variable dictionary of submenu , it's parentid.

when user clicks mainmenu item want swap in , display correct submenu.

when mainmenu.menuitemclick event happens postback occurs , try put correct menu dictionary submenu doesn't show.

do need postback submenu load or need javascript? or going wrong way?

below code. thanks.

imports system.data imports system.data.sqlclient imports system.collections.generic  public class rootmaster   inherits system.web.ui.masterpage    private readonly connection string = system.configuration.configurationmanager.connectionstrings("connectionstring").connectionstring    protected sub page_load(byval sender object, byval e system.eventargs) handles me.load     if not ispostback       session("menudata") = getmenudata()       addtopmenuitems(session("menudata"))     end if   end sub    private function getmenudata() datatable     using con new sqlconnection(connection)       dim cmd new sqlcommand("select * menudata", con)       dim dtmenuitems new datatable()       dim sda new sqldataadapter(cmd)        sda.fill(dtmenuitems)       cmd.dispose()       sda.dispose()        return dtmenuitems     end using   end function    private sub addtopmenuitems(menudata datatable)     dim view dataview = nothing     dim menudictionary new dictionary(of integer, menu)      view = new dataview(menudata)     view.rowfilter = "parentid null"     each row datarowview in view       'adding menu item'       if row("isactive")         dim rowid integer = row("id")         dim newmenuitem new menuitem(row("text").tostring(), rowid.tostring())         newmenuitem.navigateurl = row("navigateurl").tostring()         mainmenu.items.add(newmenuitem)          'create sub menus each main menu item, add dictionary'         dim subm = createsubmenus(menudata, newmenuitem)         if subm.items.count > 0           menudictionary.add(rowid, subm)         end if       end if     next      session("menucollection") = menudictionary     mainmenu.items(0).selected = true     view = nothing   end sub    private function createsubmenus(menudata datatable, parentmenuitem menuitem) menu     dim view dataview = nothing     dim result new menu      view = new dataview(menudata)     view.rowfilter = "parentid=" & parentmenuitem.value      each row datarowview in view       if row("isactive")         dim newmenuitem new menuitem(row("text").tostring(), row("id").tostring())         newmenuitem.navigateurl = row("navigateurl").tostring()         result.items.add(newmenuitem)       end if     next      return result   end function    protected sub mainmenu_itemclick(source object, e menueventargs) handles mainmenu.menuitemclick     if not session("menucollection") nothing       dim menudictionary dictionary(of integer, menu) = directcast(session("menucollection"), dictionary(of integer, menu))        if menudictionary.containskey(e.item.value)         submenu = menudictionary.item(e.item.value)       end if     end if   end sub end class

would possible redrawing of sub menu on prerender event. so, example:

protected sub mainmenu_itemclick(source object, e menueventargs) handles mainmenu.menuitemclick if not session("menucollection") nothing   dim menudictionary dictionary(of integer, menu) = directcast(session("menucollection"), dictionary(of integer, menu))    if menudictionary.containskey(e.item.value)     submenu = menudictionary.item(e.item.value)   end if  end if end sub

might become:

protected sub mainmenu_prerender(byval sender object, byval e eventargs) handles mainmenu.prerender if not session("menucollection") nothing    dim menudictionary dictionary(of integer, menu) = directcast(session("menucollection"), dictionary(of integer, menu))          if menudictionary.containskey(e.item.value)         submenu = menudictionary.item(e.item.value)         end if end if  end sub

if isn't working i'm afraid i'm not beyond that, thought though. figure if problem need preload menu using prerender maybe solve it.


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